matlab 2012 ieee projects

IEEE 2012 MATLAB Titles & Abstract

FOR REGISTER: www.finalyearstudentsproject.com

CONTACT NO.: 91-9176696486.

Address: No.73, karuneegar street, Adambakkam, Chennai-88

ACTIVE POWER FILTER BASED ON CASCADED TRANSFORMER MULTILEVEL INVERTER

ABSTRACT :

The widespread increase of non-linear loads nowadays, significant amounts of harmonic

currents are being injected into power systems. Harmonic currents flow through the power

system impedance, causing voltage distortion at the harmonic currents’ frequencies. The

distorted voltage waveform causes harmonic currents to be drawn by other loads connected at the

point of common coupling (PCC).

The use of grid connected power electronic converters to improve power quality in

power distribution systems represents the best solution, in terms of performance and stability, for

the elimination of harmonic distortion, power factor correction, balancing of loads, and voltage

regulation. The traditional method of current harmonics reduction involves passive LC filters,

which are its simplicity and low cost. However, passive filters have several drawbacks such as

large size, tuning and risk of resonance problems

In this project, we propose an APF based on cascaded H-bridge multilevel converter

which employs one single dc input power source and isolated single-phase low-frequency

transformers. By the proposed circuit configuration, a number of dc-link can be reduced,

compared with traditional APF based on cascaded H-bridge multilevel converter. With this type

of topology, higher voltage levels can be achieved, making the proposed topology suitable for

compensation of medium and high voltage power distribution systems. A simple control scheme

is used for the correct operation of inverter and compensation demands. The current reference

required can be obtained allowing the generation of the total compensating current and the

absorption of the needed active power to compensate converter losses and to keep the dc

voltages constant. Simulated results carried out by MATLAB/Simulink program for steady-state

http://www.finalyearstudentsproject.com/



CONTACT NO.: 91-9176696486.


and transient operating conditions prove the compensation effectiveness of the proposed scheme.

Simulation results show the validity and effectiveness of presented active power filter for

compensation of harmonic currents, reactive power and unbalance currents.

A PRACTICAL TECHNIQUE FOR POWER QUALITY IMPROVEMENT FOR SINGLE PHASE INDUCTION

MACHINES

ABSTRACT :

Most of the electrical loads in our daily life are single phase as well as inductive. Single

phase induction machines are one of the many reasons for poor quality power supply along with

some concerns on torque requirements, accelerating time, starting current, and dip in voltage and

harmonics in input current. During starting, power supply is more adversely affected.

When single motors at homes are started, a visible fluctuation in lights is observed. This

is due to the poor quality of power during starting of single phase induction motor. When the

motor is started, it draws high starting current. This high current cause’s dip in the voltage during

starting intervals, because there is a lot of voltage drop across the distribution conductor.

This project presents an analysis of all the above mentioned problems along with a

practical way to mitigate them. In this project, induction motor under test is the capacitor run

motor. In this project a practical approach is presented using classical LC circuit techniques.

The results and tests performed before and after application of the proposed solution have been

analyzed and presented. The frequency, running current waveform current components in time

domain are simulated using MATLAB/Simulink software, The conclusions presented in this




CONTACT NO.: 91-9176696486.


paper will stimulate and direct future research work for maintaining high quality power supply

during starting of induction machine.

ACTIVE POWER FILTER BASED ON CASCADED TRANSFORMER MULTILEVEL INVERTER

ABSTRACT :

The widespread increase of non-linear loads nowadays, significant amounts of harmonic

currents are being injected into power systems. Harmonic currents flow through the power

system impedance, causing voltage distortion at the harmonic currents’ frequencies. The

distorted voltage waveform causes harmonic currents to be drawn by other loads connected at the

point of common coupling (PCC).

The use of grid connected power electronic converters to improve power quality in

power distribution systems represents the best solution, in terms of performance and stability, for

the elimination of harmonic distortion, power factor correction, balancing of loads, and voltage

regulation. The traditional method of current harmonics reduction involves passive LC filters,

which are its simplicity and low cost. However, passive filters have several drawbacks such as

large size, tuning and risk of resonance problems




CONTACT NO.: 91-9176696486.


In this project, we propose an APF based on cascaded H-bridge multilevel converter

which employs one single dc input power source and isolated single-phase low-frequency

transformers. By the proposed circuit configuration, a number of dc-link can be reduced,

compared with traditional APF based on cascaded H-bridge multilevel converter. With this type

of topology, higher voltage levels can be achieved, making the proposed topology suitable for

compensation of medium and high voltage power distribution systems. A simple control scheme

is used for the correct operation of inverter and compensation demands. The current reference

required can be obtained allowing the generation of the total compensating current and the

absorption of the needed active power to compensate converter losses and to keep the dc

voltages constant. Simulated results carried out by MATLAB/Simulink program for steady-state

and transient operating conditions prove the compensation effectiveness of the proposed scheme.

Simulation results show the validity and effectiveness of presented active power filter for

compensation of harmonic currents, reactive power and unbalance currents.

A COMPARISON OF SYMMETRICAL AND ASYMMETRICAL THREE-PHASE H-BRIDGE MULTILEVEL INVERTER FOR

DTC INDUCTION MOTOR DRIVESABSTRACT :

Multilevel voltage-source inverters are intensively studied for high-power applications

and standard drives for medium-voltage industrial applications have become available Solutions

with a higher number of output voltage levels have the capability to synthesize waveforms with a

better harmonic spectrum and to limit the motor winding insulation stress. Earlier studies have

pointed out the limitations of conventional inverters, especially in high-voltage and high-power

applications.




CONTACT NO.: 91-9176696486.


In recent years, multilevel inverters are becoming increasingly popular for high-power

applications due to their improved harmonic profile and increased power ratings. Several studies

have been reported in the literature on multilevel inverters topologies, control techniques, and

applications. However, there are few studies that actually discuss or evaluate the performance of

induction motor drives associated with three-phase multilevel inverter.

This project presents then a comparison study for a cascaded H-bridge multilevel direct

torque control (DTC) induction motor drive. In this case, symmetrical and asymmetrical

arrangements of five- and seven-level H-bridge inverters are compared in order to find an

optimum arrangement with lower switching losses and optimized output voltage quality.

For the validation of the earlier discussed control approach, simulations and experiments

have been carried out. The carried out experiments show that an asymmetrical configuration

provides nearly sinusoidal voltages with very low distortion, using less switching devices.

Moreover, torque ripples are greatly reduced. Simulation results for five levels cascaded and

seven-level H-bridge inverter Shown using MATLAB/Simulink software.

A DYNAMIC VOLTAGE RESTORER EQUIPPED WITH A HIGH-FREQUENCY ISOLATED DC–DC CONVERTER




CONTACT NO.: 91-9176696486.


ABSTRACT :

This project presents a dynamic voltage restorer (DVR) that is characterized by the use of

a high-frequency unidirectional isolated dc–dc converter. Voltage sag is the most power quality

problem facing now days in distribution system; this project discusses the control and

performance of a low-voltage DVR using a high-frequency isolated dc–dc converter. The high-

frequency (20-kHz) transformer in the dc–dc converter is much smaller, for example, one-

hundredth, in volume than the line-frequency transformer. DVR, which is characterized by

connecting the shunt converter (the diode rectifier) to the supply side.

The DVR consists of shunt and series converters connected back to back and a common

dc capacitor as an energy-storage device. Multilevel topologies such as diode-clamped or

cascaded pulse width modulation (PWM) converters can eliminate line frequency transformers

from medium-voltage applications,

A main motivation of the isolated dc–dc converters is to replace line-frequency

transformers with high-frequency transformers, in which galvanic isolation is indispensable

between the two sets of dc terminals; Experimental results obtained by a 200-V 5-kW laboratory

system have verified the viability and effectiveness of the DVR. In the near future, replacing Si

devices with SiC devices will bring significant reductions in volume and weight to the dc–dc

converter, as well as the series converter. Simulation has been done using

MATLAB/SIMULINK software.




CONTACT NO.: 91-9176696486.


A HYBRID AC/DC MICRO GRID AND ITS COORDINATION CONTROL

ABSTRACT :

THREE PHASE ac power systems have existed for over 100 years due to their efficient

transformation of ac power at different voltage levels and over long distance as well as the

inherent characteristic from fossil energy driven rotating machines. Recently more renewable

power conversion systems are connected in low voltage ac distribution systems as distributed

generators or ac micro grids due to environmental issues caused by conventional fossil fueled

power plants. Recently dc grids are resurging due to the development and deployment of

renewable dc power sources and their inherent advantage for dc loads in commercial, industrial

and residential applications, the dc micro grid has been proposed to integrate various distributed

generators. However, ac sources have to be converted into dc before connected to a dc grid and

dc/ac inverters are required for conventional ac loads.

This project proposes a hybrid ac/dc micro grid to reduce the processes of multiple dc–

ac–dc or ac–dc–ac conversions in an individual ac or dc grid. The hybrid grid consists of both ac

and dc networks connected together by multi-bidirectional converters. AC sources and loads are

connected to the ac network whereas dc sources and loads are tied to the dc network. Energy

storage systems can be connected to dc or ac links. The proposed hybrid grid can operate in a

grid-tied or autonomous mode. The coordination control algorithms are proposed for smooth

power transfer between ac and dc links and for stable system operation under various generation




CONTACT NO.: 91-9176696486.


and load conditions. Uncertainty and intermittent characteristics of wind speed, solar irradiation

level, ambient temperature, and load are also considered in system control and operation.

A small hybrid grid has been modeled and simulated using the Simulink in the

MATLAB. The simulation results show that the system can maintain stable operation under the

proposed coordination control schemes when the grid is switched from one operating condition

to another.

A MODIFIED C-DUMP CONVERTER FOR BLDC MACHINEUSED IN A FLYWHEEL ENERGY STORAGE SYSTEM

ABSTRACT :

The permanent magnet brushless DC machine (BLDCM) is one of the suitable motors for

the flywheel energy storage system (FESS) The common half-bridge topology for high-speed

BLDCM. It includes a buck chopper and a half-bridge converter. Compared with the full-bridge

converter, the half bridge converter has half the number of switches and avoids the short circuit

across the phase leg in the full-bridge converter.

However, this half-bridge topology has two disadvantages for the FESS: 1) the energy

unidirectional flow, and 2) the energy of the turnoff phase is consumed on the resistance which

means the waste of energy.

This project presents a modified C-dump converter for brushless DC (BLDC) machine

used in the flywheel energy storage system. The converter can realize the energy bidirectional

flowing and has the capability to recover the energy extracted from the turnoff phase of the




CONTACT NO.: 91-9176696486.


BLDC machine. The principle of operation, modeling, and control strategy of the system has

been investigated in the paper. Simulation and experimental results of the proposed system are

also presented and discussed.

A MINIMUM POWER-PROCESSING-STAGE FUEL-CELL ENERGY SYSTEM BASED ON A BOOST-INVERTER WITH A

BIDIRECTIONAL BACKUP BATTERY STORAGE

ABSTRACT :

When low-voltage unregulated fuel-cell (FC) output is conditioned to generate ac power,

two stages are required: a boost stage and an inversion one. A two-stage FC power conditioning

system to deliver ac power has been commonly considered and studied. The system usually

includes transformer-type dc–dc boost converter stage and dc-to-ac inverter stage with auxiliary

energy unit. This type of power conditioning system has inevitable drawbacks, such as being

bulky, costly, and inefficient, because each stage has to have a high efficiency for higher overall

efficiency and normally more than six active components (switches and diodes) are required.

In order to minimize the problems with a two-stage FC power conditioning system, a

topology with reduced power processing and conversion stages is required. A topology that is

suitable for ac loads and is powered from dc sources able to boost and invert the voltage at the




CONTACT NO.: 91-9176696486.


same time has been proposed. The double-loop control scheme of this topology has also been

proposed for better performance, even during transient conditions.

In this paper, the boost-inverter topology that achieves both boosting and inversion

functions in a single stage is used to develop an FC-based energy system that offers high

conversion efficiency, low-cost, and compactness. The proposed system incorporates additional

battery-based energy storage and a dc–dc bidirectional converter to support instantaneous load

changes. The output voltage of the boost-inverter is voltage-mode controlled and the dc–dc

bidirectional converter is current-mode controlled. The load low-frequency current ripple is

supplied by the battery, which minimizes the effects of such ripple being drawn directly from the

FC itself. Analysis, simulation, and experimental results are presented to confirm the operational

performance of the proposed system.

A NEW APPROACH TO MULTIFUNCTIONAL DYNAMIC VOLTAGE RESTORER IMPLEMENTATION FOR

EMERGENCY CONTROL IN DISTRIBUTION SYSTEMS

ABSTRACT :

The dynamic voltage restorer (DVR) is one of the modern devices used in distribution

systems to protect consumers against sudden changes in voltage amplitude. In this project,

emergency control in distribution systems is discussed by using the proposed multifunctional

DVR control strategy. Also, the multi loop controller using the Posicast and P+Resonant

controllers is proposed in order to improve the transient response and eliminate the steady-state

error in DVR response, respectively.




CONTACT NO.: 91-9176696486.


The main purpose is to detect and compensate for the voltage sag with minimum DVR

active power injection. Also, the in-phase compensation method can be used for sag and swell

mitigation. The multiline DVR can be used for eliminating the battery in the DVR structure and

controlling more than one line. Moreover, research has been made on using the DVR in medium

level voltage. Harmonic mitigation and control of DVR under frequency variations are also in

the area of research. The closed-loop control with load voltage and current feedback is

introduced as a simple method to control the DVR.

The proposed algorithm is applied to some disturbances in load voltage caused by

induction motors starting, and a three-phase short circuit fault. Also, the capability of the

proposed DVR has been tested to limit the downstream fault current. The current limitation will

restore the point of common coupling (PCC) (the bus to which all feeders under study are

connected) voltage and protect the DVR itself. The innovation here is that the DVR acts as a

virtual impedance with the main aim of protecting the PCC voltage during downstream fault

without any problem in real power injection into the DVR.

The basis of the proposed control strategy in this project is that when the fault current

does not pass through the DVR, an outer feedback loop of the load voltage with an inner

feedback loop of the filter capacitor current will be used. Also, a feed forward loop will be used

to improve the dynamic response of the load voltage. Moreover, to improve the transient

response, the Posicast controller and to eliminate the steady-state error. Simulation results show

the capability of the DVR.

A NEW METHOD FOR POWER QUALITY IMPROVEMENT IN CLASSICAL AC/AC VOLTAGE CONTROLLERS USING PWM

TECHNIQUEABSTRACT :

There are three basic types of AC to AC converters. The simplest ones, the AC voltage

controllers, allow controlling the output voltage only, while the output frequency is the same as




CONTACT NO.: 91-9176696486.


the input frequency. The second one is the Cycloconverters. In Cycloconverters, the output

frequency can be controlled, but it is at least one order of magnitude lower than the input

frequency. In both the AC voltage controllers and Cycloconverters, the maximum available

output voltage approaches the input voltage. The last one is the matrix converter. Because of

having no inherent limits on the output frequency, matrix converters are most versatile, but the

maximum available output voltage is about 15% lower than the input voltage AC voltage

controllers are widely used to obtain variable AC voltage from fixed AC source.

A lot of topologies of pulse-width modulated (PWM)-AC voltage controllers for single-

phase and three phase systems are proposed up to date. PWM-AC controllers have important

advantages compared with the phase-controlled AC voltage controllers using Thyristors and

Triacs. This project presents a novel control technique for application to PWM-AC controllers

with ability of generating smaller harmonics. In the proposed control method, both the traditional

AC voltage controllers and the PWMAC controllers are combined, smaller THD values are

obtained and switching losses are minimized. Thus, the harmonic pollution in the power system

will be reduced and the power quality will be increased.

In order to investigate the proposed controller performance, computer simulations are

performed. Obtained results are compared with those of the conventional PWM-AC controller

According to the simulation sector-control with PWM method has better performance than

phase-angle control with PWM method does. So, sector-control with PWM method is

recommended to the power community. This method can be of practical value in replacing the

conventional counterparts that are used in controlling heating elements and speed control of

small fractional horsepower induction motors. Simulation results are conducted using


A NEW MULTILEVEL INVERTER TOPOLOGY USING LESS NUMBER OF SWITCHES

ABSTRACT :




CONTACT NO.: 91-9176696486.


Multilevel voltage source inverter is recognized as an important alternative to the normal

two level voltage source inverter especially in high voltage application. Using multilevel

technique, the amplitude of the voltage is increased, stress in the switching devices is reduced

and the overall harmonics profile is improved. Among the familiar topologies, the most popular

one is cascaded multilevel inverter. It exhibits several attractive features such as simple circuit

layout, less components counts, modular in structure and avoid unbalance capacitor voltage

problem. However as the number of output level increases, the circuit becomes bulky due to the

increase in the number of power devices, the general purpose of the multilevel inverter is to

synthesize a nearly sinusoidal voltage from several levels of dc voltages, typically obtained from

capacitor voltage sources. As the number of level increases, the synthesized output waveform

has more steps, which produce a staircase wave that approaches a desired waveform. Also as

more steps added to the waveform, the harmonic distortion of the output waveform decreases,

approaching zero as the level increases. As the number of level increases, the voltage that can be

summing multiple voltage levels also increases.

These new types of converters are suitable for high voltage and high power application

due to their ability to synthesize waveforms with better harmonic spectrum. Numerous

topologies have been introduced and widely studied for utility and drive applications. Amongst

these topologies, the multilevel cascaded inverter was introduced in Static VAR compensation

and drive systems. This project presents a new technique for getting a multilevel output and also

uses PWM control techniques. In this technique, the number of switches used for the dc to ac

conversion is reduced. So this dc to ac conversion significantly reduces the initial cost. This

technique exhibits some attractive features which suits industrial applications.

MATLAB/Simulink environment is used to simulate the results.

The simulation of the seven-level multilevel inverter is successfully done using pulse

width modulation technique. From the simulation, it is noted that the new multilevel inverter




CONTACT NO.: 91-9176696486.


topology works well and shows hope to reduce the initial cost and complexity. When we increase

the levels, the number of switches used is very less compared to the other topology.

A NOVEL APPROACH IN SOFT STARTING OF LARGE INDUCTION MOTORS

ABSTRACT :

The electric power consumption of AC motor is a great part of the total domestic consumption.

So, high efficiency and stability of AC motor can realize energy-saving and cost reducing effectively. Not

only AC motor need to be soft-started to lessen current surge and electric fence voltage-drop, but also its

speed need to be able to adjusted to improve efficiency. If the induction motor is started directly, its

starting current will be up to 5-8 times the rated value, which causes a sharp decline in voltage of the

connecting power network, affecting normal operation of other equipments and causing a great impact on

the motor, especially on cage-type rotor whose bars and rings would be destroyed enormously.

As the development of the power electronics technology, computer control technology and

automatic control technology, electronic soft-start controller has appeared, while in generally, the starters

on the market only have basic modes such as current-limited and voltage step ramping soft-start.

Although it can meet the demands of most kinds of loads, the start state is not optimal, direct online

induction machine starts have many disadvantages. Torque pulsations are often large and vary from

positive to negative values. These torque transients in a motor shaft are transmitted to the load, resulting

in mechanical wear in the motor bearings and load couplings. Therefore, properly controlling the starting

currents and torques of induction machines is of great importance in many instances.

This project proposes a new series compensator based circuit for soft starting of IM. This circuit

consists of a diode-bridge type DC reactor that connects in series with each phase of transformer. It does

not need any control, measurement and gate driving circuits. The power circuit simplicity, reliable

operation and almost no effect on normal operation of IM are other advantages of proposed circuit. The

theoretical analysis and the effect on voltage quality are presented. The proposed circuit consists of three

similar diode-bridges and a single coil that each connects in series with each-phase of induction motor.

This circuit has almost no effect in normal operation of induction motors. The simplicity of proposed




CONTACT NO.: 91-9176696486.


circuit, easy to build and absence of control circuits are the main attractive points of circuit. The

analytical analysis and designing characteristics for DC reactor in proposed circuit are presented.

The overall circuit operation in transient and steady state cases are studied in detail. Simulation

results are obtained to verify the valuable operation of proposed circuit in soft starting. The simulation

results are obtained to verify the performance of proposed method in transient and steady states.

A NOVEL BVC-RBF NEURAL NETWORK BASED SYSTEM SIMULATION MODEL FOR SWITCHED RELUCTANCE

MOTOR

ABSTRACT :

THE switched reluctance motor (SRM) drive is considered as an attractive candidate for

variable speed motor drives due to its low cost and rugged structure, reliable converter topology,

and high efficiency over a wide speed range, and fault-tolerant performance. These drives are

suitable for applications such as electric vehicles, aircraft starter/generator systems, mining

drives, robotics, and. On the one hand, several approaches have been reported in the literature for

obtaining and describing the flux linkage characteristics of SRM, FEA is the most commonly

used method for calculating the flux linkage characteristics without experimental measurement,

which is quite suitable for machine design and performance prediction.

Nevertheless, almost all of the aforementioned intelligent approximation methods such as

ANN, ANFIS, and RBF are conditioned on that the model is determined based on the

observational data only. But in the modeling task, there is more or less some prior knowledge

available, which can help to improve the model generalization. A new topology of RBF neural

network with boundary value constraints that has the capability of automatically satisfying types

of prior knowledge is proposed, without adding algorithmic complexity and computational costs.




CONTACT NO.: 91-9176696486.


The so-called BVC-RBF neural network is applied to modeling of the flux linkage characteristic

in this project.

The purpose of this project is to develop a SRM system simulation model considering the

critical problems as discussed above. In this projetc, a double scalar magnetic potential method

(DSMP) based 3-D FEM together with enhanced incremental energy method (EIEM) is used for

flux linkage calculation, which considers the end effect and reduces the computation time. In

order to get better approximation results, a novel BVC-RBF neural network is applied for

modeling of the flux linkage characteristics. Based on the modeling results, a SRM system

simulation model is studied here using MATLAB/Simulink. All simulations are completely

documented by their blocks, corresponding special MATLAB functions, and parameters.

A SEVEN-LEVEL INVERTER TOPOLOGY FOR INDUCTION MOTOR DRIVE USING TWO-LEVEL INVERTERS AND

FLOATING CAPACITOR FED H-BRIDGES

ABSTRACT :

THE capability of multilevel inverters to generate voltage waveform with less harmonic distortion, at

reduced switching frequency, using switching devices of low-voltage ratings makes them preferred choice for

medium- and high voltage power processing applications. This has led to their increasing applications in the control

of medium and high voltage ac drives .Though with increase in number of levels the quality of waveform improves,

it also increases the complexity of the circuit due to the increase in the number of devices and associated control

circuitry. The other issues of concern in industrial applications are reliability and efficiency of the system. Hence,

the researchers in this field are focused mainly on the development of less complex, more reliable and efficient

multilevel inverter topologies. A survey of multilevel inverter topologies is presented. The conventional multilevel

converters include the neutral point clamped (NPC), flying capacitor, and cascaded H-bridge topologies. Dual

inverter configuration for an open-end winding induction motor is another interesting multilevel topology for drive

applications.

The seven-level inverter topology proposed in this is intended for an induction motor with open-end

winding structure. Here, in addition to two two-level inverters feeding the coils from both ends, two H-bridge cells

are connected in series with the motor winding in each phase. These H-bridge cells are fed by capacitors whose




CONTACT NO.: 91-9176696486.


voltages are maintained at the required level. An important advantage of this topology is the reduction in dc-link

voltage requirement by half when compared with the requirement of dc-link voltage in NPC topology. In this

topology, there are multiple ways of generating middle voltage levels and this feature is utilized in balancing the

capacitor voltages in the entire modulation range. It needs only two isolated dc-voltage sources of voltage rating Vdc

/2 where Vdc is the dc voltage magnitude required by the conventional neutral point clamped (NPC) seven-level

topology. The proposed topology is capable of maintaining the H-bridge capacitor voltages at the required level of

Vdc /6 under all operating conditions, covering the entire linear modulation and over modulation regions, by making

use of the switching state redundancies.

In the event of any switch failure in H-bridges, this inverter can operate in three-level mode, a feature that

enhances the reliability of the drive system. The two level inverters, which operate at a higher voltage level of

Vdc /2, switch less compared to the H-bridges, which operate at a lower voltage level of Vdc /6, resulting in

switching loss reduction. The experimental verification of the proposed topology is carried out for the entire

modulation range, under steady state as well as transient conditions.

Simulation results are studied using MATLAB/SIMULINK software.

MODELING AND ANALYSIS OF MULTILEVEL INVERTERS USING UNIPOLAR AND BIPOLAR

SWITCHING SCHEMES

ABSTRACT :

For higher power applications, multilevel inverter structures have the particular

advantages of operation at high dc-bus voltages which is achieved using series connection of

switching devices. Moreover, a reduction in output voltage harmonics is achieved by switching

between multiple voltage levels. The two most common multilevel inverter topologies are the

diode clamped inverter and the cascaded inverter. In the paper, we will discuss about the

cascaded multilevelinverter. The cascaded multilevel inverter uses series strings of single phase




CONTACT NO.: 91-9176696486.


full bridge inverter to construct multilevel phase legs. A particular advantage of this topology is

that the modulation, control and protection requirement of each bridge are modular. Moreover,

multilevel inverter topologies are able to generate better output quality, while operating at lower

switching frequency. This implies lower switching dissipation and higher efficiency. In this

paper, the conventional PWM inverter and the cascaded multilevel PWMinverter is modeled in

MATLAB Simulink. The analysis of the conventional PWM inverter and the cascaded multilevel

PWMinverter using unipolar and bipolar switching schemes is done and finally the results are

compared.

MAXIMUM VOLTAGE ANGLE OPTIMIZATION OF UNINTERRUPTIBLE POWER SUPPLY ON THREE-LEVEL

TRANSFORMER-LESS PHOTOVOLTAIC INVERTER

ABSTRACT :


http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6236418&contentType=Conference+Publications&ranges%3D2011_2013_p_Publication_Year%26queryText%3Dinverter





CONTACT NO.: 91-9176696486.


This paper presents a new topology of three-level transformer-less photovoltaic

(PV) inverter. In this topology, a 240V AC system is developed from a full bridge inverter circuit

using PIC microcontroller (PIC16F628A-I/P) connected to an array of PV panel through a power

factor correction circuit. The output waveform of theinverter depends on the type of pulse driver.

The inverter is connected to the utility supply, on the clear day, the ac load is served by

the inverter but on the cloudy day or night where solar irradiance is low, the inverterthrough its

PIC microcontroller automatically changes from the usage of inverter to the utility supply.

Objective of this paper is to optimize the maximum voltage angle to obtain the lowest current

total harmonic distortion (CTHD) of the uninterruptible power supply (UPS) on the three-level

single phase transformer-less inverter. In this paper, the maximum voltage angle optimization of

the AC three-level waveform transformer-less PV inverteris developed and created by a

microcontroller PIC16F627A-I/P changing maximum voltage angle of the AC three-level

waveform from 20° to 180°. Resistive load of 30 W lamp and inductive load of 20 W water

pump are applied to the transformer-less PV single phase inverter. The result shows that the

lowest CTHD of 15.448% is obtained when the maximum voltage angle is 134°.

SINGLE STAGE THREE-LEVEL MPPT INVERTER FOR SOLAR SUPPLIED SYSTEMS

ABSTRACT :




CONTACT NO.: 91-9176696486.


In this study, a single stage, three-phase, three-level neutral point clamped inverter is

designed for grid connected renewable energy systems. The proposed voltage source inverter is

operated in current controlled mode and a PI current controller is used for the production of

switching pattern. Also the proposed inverter is operated in parallel with public grid by using

phase locked loop method. Maximum power point tracking process which is aimed to obtain

maximum energy from the supply is performed via the proposed inverter without using any

additional DC-DC converter. Maximum power point tracking algorithm generates the current

reference for the current controller. Results of experimental studies show that inverter output

current is in phase with line and unity power factor operation is obtained. Also inverter output

current total harmonic distortion is measured as 3.95%. This value is in the limits of international

standards (5%).




CONTACT NO.: 91-9176696486.


DIGITAL SIMULATION OF RENEWABLE ENERGY SOURCE

CONTROLLED EZ-SOURCE INVERTER SYSTEM

ABSTRACT :

Z-Source inverter for buck-boost energy conversion is implemented using only passive

elements with no additional active elements. Therefore Z-Source inverter is less complex. From

prospects of Z-Source inverter, an Embedded EZ-Source inverter that can produce the same gain

as Z-Source inverter is introduced. This paper contributes the digital simulation of renewable

energy source controlled EZ-Source inverter system. Input to the Embedded EZ-

Source inverter is obtained from solar cell. The ripple in the output voltage of solar cell is filtered

using Z-filter. Pure DC is given to the three-phase inverter. The inverter converts DC in to three-

phase balanced AC. The output of the Embedded EZ-Source inverter is used to control the

harmonics present in the load. The system is modeled using matlab simulink. Simulation studies

are done with induction motor load. The simulation results are presented.




CONTACT NO.: 91-9176696486.


Z-SOURCE THREE-PHASE FOUR-SWITCH INVERTER WITH

DC LINK SPLIT CAPACITOR AND COMPREHENSIVE

INVESTIGATION OF Z-SOURCE THREE-PHASE FOUR-

SWITCH INVERTERS

ABSTRACT :

Recently z-source network has been used in B4 inverter to create buck-boost four-switch

three-phase inverter. In fact, these topologies combine the advantages of a traditional four-switch

three-phase inverter with the advantages of the Z-impedance network. This paper proposes a new

topology of z-source B4 inverter. New proposed topology, besides advantages of pervious z-

source B4 inverters has the self-boost property and can be used as post-fault topology in the

switch redundant fault tolerant Z-source inverter. For the proposed topology, both CBPWM and

SVM switching method are proposed and the performance of CBPWM is verified by

experimental results. Furthermore, comprehensive analysis on boost topologies for the

B4 inverter including the proposedinverter is done in this paper. Analysis is done on switching

strategy and boosting capability of different topologies.




CONTACT NO.: 91-9176696486.


MODULAR SINGLE-PHASE TRANS-Z-SOURCE INVERTER

FOR MULTI-INPUT RENEWABLE ENERGY SYSTEM

ABSTRACT :

This paper presents a novel modular single-phase trans-Z-source inverter for the multi-

input grid-connected renewable energy (photovoltaic/wind/fuel cell) system in order to simplify

the system structure and reduce the cost. The proposed modular single-phase trans-Z-

source inverter evolves from the original Z-source inverter by incorporating coupled inductors

and center-tapped capacitors and thus making the system neutral available. By utilizing the extra

shoot-through state which is prohibited in the conventional voltage-source inverter to avoid short

circuit, the proposed inverter can perform DC-DC boost conversion and DC-AC inversion

simultaneously based on the single-stage structure. Multiple inverter modules can be flexibly

configured in terms of terminal interconnections, and thus they can adapt to multiple energy

sources at different voltage levels and power capacities. More importantly, a shared DC bus




CONTACT NO.: 91-9176696486.


decouples the AC outputs of the interconnected inverter modules from their inputs and enables

the system to supply balanced power to the grid. Circuit modularization and minimum required

devices predict a significantly reduced cost; furthermore, the shoot-through operation offers a

great EMI immunity and reliability.

LOW-COST SEMI-Z-SOURCE INVERTER FOR SINGLE-

PHASE PHOTOVOLTAIC SYSTEMS

ABSTRACT :

This paper presents several nonisolated semi-Z-source inverters for a single-phase

photovoltaic (PV) system with low cost and doubly grounded features. These semi-Z-

source inverters employ the Z-source/quasi-Z-source network and only two active switches to

achieve the same output voltage as the traditional voltage-fed full-bridge inverter does. The two

active switches of the semi-Z-source inverter are controlled complementarily. Different from the

traditional single-phase Z-source/quasi-Z-source inverter, shoot-through zero state is not

applicable to the semi-Z-source inverter. The input dc source and the output ac voltage of the




CONTACT NO.: 91-9176696486.


semi-Z-sourceinverter share the same ground, thus leading to less leakage ground current

advantages over other nondoubly grounded inverters, such as voltage-fed full-bridge inverter.

This is a preferred feature for nonisolated grid-connected inverters, especially in PV application.

A revised nonlinear sinusoid pulse width modulation method for a semi-Z-source inverter is also

proposed. By using this method, desired duty cycle can be generated to output the sinusoidal

voltage. Other dc-dc converters with similar voltage gain curve, which can also be used as a

single-phase inverter, are also discussed and summarized. A single-phase semi-Z-

source inverter prototype is built; experimental results are provided to verify and demonstrate the

special features of the proposed circuit.

SOLAR INTEGRATED CURRENT-FED QUASI-Z-

SOURCE INVERTER WITH POWER BUCK-BOOST

CAPABILITY

ABSTRACT :


http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6216114&contentType=Conference+Publications&ranges%3D2012_2013_p_Publication_Year%26pageNumber%3D5%26queryText%3Dinverter





CONTACT NO.: 91-9176696486.


Solar integrated current-fed quasi-Z-source inverter (qZSI) have been proposed to

overcome the limitations of current-source inverter (CSI) and current-fed Z (impedance)

sourceinverter (ZSI). The problems with CSI are unidirectional power flow and can perform only

voltage boost operation. On the other hand ZSI is bidirectional with an additional diode and have

voltage buck-boost capability. The techniques of ZSI and qZSI are more or less the same but

qZSIs are considered to be more efficient and reliable. The drawback of ZSI is that the inductors

must sustain high currents. Space vector pulse-width modulation is analyzed in this paper; here

the power buck-boost capability is attained by changing the values of input inductance.

Simulation results are shown.




CONTACT NO.: 91-9176696486.


SWITCHING PATTERN SELECTION SCHEME BASED

CASCADED MULTILEVEL INVERTER FED INDUCTION

MOTOR DRIVE

ABSTRACT :

This paper focus on switching pattern selection scheme based cascaded

multilevel inverter fed induction motor drive. It offer several advantages compared to the

conventional 3-phase bridge inverter in terms of lower dv/dt stresses, lower electromagnetic

compatibility, smaller rating and better output features. The proposed method has been designed

an eleven-level cascaded multilevel inverter by using sinusoidal pulse width modulation

technique. The selected pattern has been exposed to give superior performance in load voltage,

total harmonics distortion and capacitor voltage fluctuation. The performance of proposed

strategies is confirmed through simulation and hardware investigations.







CONTACT NO.: 91-9176696486.


DIODE CLAMPED THREE LEVEL INVERTER USING

SINUSOIDAL PWM

ABSTRACT :

An inverter is a circuit which converts dc power into ac power at desired output voltage

and frequency. The a.c. output voltage can be fixed at a fixed or variable frequency. This

conversion can be achieved by controlled turn ON & turn OFF or by forced commutated

thyristors depending on applications. The output voltage waveform of a practical inverter is non

sinusoidal but for high power applications low distorted sinusoidal waveforms are required. The

filtering of harmonics is not feasible when the output voltage frequency varies over a wide range.

There is need for alternatives. Three level Neutral Point Clamped inverter is a step towards it.




CONTACT NO.: 91-9176696486.


A NEW METHOD FOR SELECTIVE HARMONIC

ELIMINATION IN VOLTAGE SOURCE INVERTER USING

IMPERIALIST COMPETITIVE ALGORITHM

ABSTRACT :

This paper presents an efficient and reliable Evolutionary Algorithm based solution for

Selective Harmonic Elimination (SHE) switching pattern. This method eliminates considerable

amount of lower order line voltage harmonics in Pulse Width Modulation (PWM) inverter.

Determination of pulse pattern for the elimination of some lower order harmonics of a

PWM inverter necessitates solving a system of nonlinear transcendental equations. Imperialist

Competitive Algorithm is used to solve nonlinear transcendental equations for PWM-SHE.

Several methods are available to eliminate the higher order harmonics and it can be easily

removed. But the greatest challenge is to eliminate the lower order harmonics and this is

successfully achieved using Imperialist Competitive Algorithm without using transformer.

Simulations using MATLAB are carried out to validate the solution and are compared with the

Genetic Algorithm. The results show that the harmonics up to 13th were totally eliminated.




CONTACT NO.: 91-9176696486.


A differential-mode current-sourced high-frequency-link

photovoltaic inverter

ABSTRACT :

A differential-mode current-fed zero-current-switching (ZCS) based voltage-doubling

photovoltaic (PV) inverter is presented. This inverter has the following features: 1) it can boost a

low-voltage (30-60 V) input to a 120-V/60-Hz output; 2) it does not require a 60-Hz transformer;

3) it does not require a front-end dc/dc converter; and 4) the topology has inherent voltage

boost/gain property thereby reducing the reliance on the transformer turns ratio.

The inverterrequires a smaller high-frequency transformer because a) the inverter switches at

100-kHz, b) the transformer voltage and current are bipolar in every switching cycle, and c) only






CONTACT NO.: 91-9176696486.


half the input current flows through the transformer at any given instant of time. To maintain the

THD within the acceptable limit, a harmonic compensation control using a proportional-resonant

(PR) controller is implemented. Analysis, design, and simulation results of the

proposedinverter are presented.

Soft-Switching Analysis Of A Resonant Capacitor Current

Feedback Self-Oscillating Inverter

ABSTRACT :

In this paper, we examine a resonant capacitor current feedback (RCCF) self-oscillating

resonant inverter from nonlinear point of view. By adopting a four-stage equivalent model, we

derive the soft-switching dead time from time-domain for the series resonant capacitor linked

parallel load circuit. Importantly, we propose a nonlinear model for the current feedback and






CONTACT NO.: 91-9176696486.


gate-drive circuit. Based on analyzing the switching transition interval of this model, the

determination of feedback parameters is inferred with given input power and resonant elements.

Experimental results have been obtained for a RCCF self-oscillating inverteroperating at 3 MHz

and 300 V bus voltage.

CURRENT CONTROLLED VOLTAGE

SOURCE INVERTER USING HYSTERESIS CONTROLLER

AND PI CONTROLLER







CONTACT NO.: 91-9176696486.


ABSTRACT :

Current-controlled pulse width modulated (PWM) voltage source inverters are most

widely used in high performance AC drive systems, as they provide high dynamic response. A

comparative study between the Hysteresis controller and Proportional-Integral controller using

PWM techniques for three-phase voltage source inverter was done. The comparison was done in

terms of total harmonic distortion (THD) level at the three phase load current. Simulation was

done with the help of Matlab-Simulink environment. The hysteresis controller provides

gooddynamic performance, whereas the Proportional-Integral controller provides instantaneous

current control and waveshaping, fixedinverter switching frequency resulting in better

harmonics.




CONTACT NO.: 91-9176696486.


INTEGRATED THREE-PHASE TRANSFORMER LESS

PV INVERTER

ABSTRACT :

This paper proposes a transformerless PV converter in which both dc-dc boost

and inverter stages are implemented by using a single standard three-leg inverter. The proposed

solution furnishes an important level of component count reduction of active devices, which

means cost, size and losses reductions in power switches and diodes. Furthermore, the paper

presents: i) relevant characteristics of the system, ii) pulse-width modulation technique; iii)

suitable control strategy; iv) voltage and current analysis; and v) simulated and experimental

results.






CONTACT NO.: 91-9176696486.


FAULT ANALYSIS OF INDUCTION MOTOR FED BY A FAULT

TOLERANT VOLTAGE SOURCE INVERTER

ABSTRACT :

Induction Motor for many years has been regarded as workhouse in industrial

applications. When the application requires large power and torque specifications, the usage of

induction motor comes into demand. This results in application of an efficient machine which is

stable during various fault conditions. This paper presents the investigations on the fault analysis

of a fault tolerantinverter fed three phase induction motor. For this purpose, a fault tolerant

operating strategy based on the connection of the faulty inverter leg to the DC link middle point

was considered. In this work, simulations studies are done for healthy condition and open leg

fault condition in the inverterof a fault tolerant VSI-fed induction motor drive.






CONTACT NO.: 91-9176696486.


THREE-PHASE TRANSFORMERLESS GRID CONNECTED

QUASI Z-SOURCE INVERTER FOR SOLAR PHOTOVOLTAIC

SYSTEMS WITH MINIMAL LEAKAGE CURRENT

ABSTRACT :

We present the design of 3-phase transformerless grid connected Quasi Z-

Source Inverter with minimal leakage current, suitable for application in solar photovoltaic

systems. A modified space vector pulse width modulation technique with a reduced number of

commutations per sector was used to minimize the leakage current without adding extra circuitry

(filters and/or leakage current isolation/bypass circuits) in a transformerless Quasi Z-

SourceInverter. Theoretical analysis of the proposed system is presented in detail and verified

using Matlab Simulink







CONTACT NO.: 91-9176696486.


SINGLE Z-SOURCE BASED CASCADED TRANSFORMER

MULTILEVEL INVERTER

ABSTRACT :

This paper proposes a new topology of cascaded transformer based

multilevel inverter using single Z-source. The suggested circuit consists of only one Z network

and single DC voltage source, as a result installation area is reduced. In this topology the output

voltage amplitude is not limited to DC voltage source and transformers turns ratios similar to

traditional cascaded transformer based multilevelinverter and can be increased with Z network

shoot-through state control. Besides, it is more reliable against short circuit. In this paper, by

using particular switching algorithm, the modulation index of inverter is kept constant and output






CONTACT NO.: 91-9176696486.


voltage is controlled by a shoot-through duty ratio, therefore Total Harmonic Distortion (THD)

of output voltage is nearly constant for different boost ratio. The performance of

suggested inverter and switching algorithm are validated with simulation results using


THE SIMULATION OF CONTROLLING STRATEGY FOR

OUTPUT CURRENT TRACKING OF GRID-

CONNECTED INVERTER

ABSTRACT :

The control strategy of grid-connected inverter has always been a core question of

generating systems. This paper analyzed three kinds of ways pf inverter's output current based on







CONTACT NO.: 91-9176696486.


the current control mode. Those are current hysteretic comparison control method, timing control

of current instantaneous comparison method and the triangle wave comparison control method of

timing tracking current. And all of three were simulated by MATLAB/Simulink. It turned out to

be that the three methods for grid-connectedinverter have good grid effect. Each of them has

their advantages and disadvantages in grid control strategy. All of them will provide theoretical

basis for further research.




CONTACT NO.: 91-9176696486.


A NEW MULTILEVEL CONVERTER TOPOLOGY WITH

REDUCED NUMBER OF POWER ELECTRONIC

COMPONENTS

ABSTRACT :

In this paper, a new topology for cascaded multilevelconverter based on

submultilevel converter units and full-bridge converters is proposed. The proposed topology

significantly reduces the number of dc voltage sources, switches, IGBTs, and power diodes as

the number of output voltage levels increases. Also, an algorithm to determine dc voltage sources

magnitudes is proposed. To synthesize maximum levels at the output voltage, the proposed

topology is optimized for various objectives, such as the minimization of the number of switches,

gate driver circuits and capacitors, and blocking voltage on switches. The analytical analyses of

the power losses of the proposedconverter are also presented. The operation and performance of

the proposed multilevel converter have been evaluated with the experimental results of a single-

phase 125-level prototype converter.


http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5764521&contentType=Journals+%26+Magazines&refinements%3D4291944246%26ranges%3D2012_2013_p_Publication_Year%26queryText%3DConverter





CONTACT NO.: 91-9176696486.


PWM PLUS PHASE ANGLE SHIFT (PPAS) CONTROL

SCHEME FOR COMBINED MULTIPORT

DC/DC CONVERTERS

ABSTRACT :

Multiport dc/dc converters are widely employed in hybrid energy generation systems to

provide stable power to key loads with high power density. In this paper, the switch duty cycle

and the phase angle of the interleaved converters are employed as two control freedoms to

achieve decoupled voltage regulation within a certain operating range among different ports,

which is referred to as pulsewidth modulation plus phase angle shift (PPAS) control scheme. An

interleaved bidirectional buck-boost converter and a full-bridge converter are integrated together

to derive a combined three-port dc/dc converter for photovoltaic (PV)-battery hybrid energy

systems, which is adopted as a typical example to explore the clear performance of the proposed

PPAS control strategy. The bidirectional buck-boost converterand the full-bridge converter share

the same power MOSFETs in the primary side, which simplifies the circuit structure and

improves the power density. The duty cycle of the interleaved bidirectional buck-

boost converter is adopted to realize the maximum power point tracking and the voltage balance

between the battery and the PV cell in the primary side. Furthermore, the phase angle of the

interleaved buck-boost converter is employed as another control freedom to achieve accurate

secondary output voltage regulation. Finally, a 100-W PV-Battery energy system is designed and

tested to verify the effectiveness of the proposed scheme.







CONTACT NO.: 91-9176696486.


A LOW-POWER AC–DC SINGLE-STAGE CONVERTER WITH

REDUCED DC BUS VOLTAGE VARIATION

ABSTRACT :

A new low-power single-stage ac-dc converter is proposed in the paper. The outstanding

feature of the converter is that it can operate with a sinusoidal input current and a low primary-

side dc bus voltage that is much less variable than that found in other single-stage converters.

The operation of the converter is discussed in the paper and its various modes of operation are

explained in detail. An analysis of the converter's steady-state characteristics is performed and

the results are used in the design of the converter. Experimental results obtained from a

prototype converterare also presented.






CONTACT NO.: 91-9176696486.


CONTROL OF IMPROVED FULL-BRIDGE THREE-LEVEL

DC/DC CONVERTER FOR WIND TURBINES IN A DC GRID

ABSTRACT :

This paper presents an improved full-bridge three-level (IFBTL) dc/dc converter for a

wind turbine in a dc grid by inserting a passive filter into the dc/dc converter to improve the

performance of the converter. The passive filter can effectively reduce the voltage stress of the

medium frequency transformer in the IFBTL dc/dc converter. A modulation strategy, including

two operation modes, is proposed for the IFBTL dc/dc converter. Then, a voltage balancing

control strategy is proposed for the IFBTL dc/dcconverter. Furthermore, the control of the wind

turbine based on the IFBTL dc/dc converter in a dc-grid system is presented. Finally, a small-

scale IFBTL dc/dc converterprototype was built and tested in the laboratory, and the results

verify the theoretical analysis.






CONTACT NO.: 91-9176696486.


POWER LOSSES CALCULATION METHODOLOGY TO

EVALUATE INVERTER EFFICIENCY IN ELECTRICAL

VEHICLES

ABSTRACT :

Nowadays, electrical vehicles (EVs) are of special interest and fuel engines are starting to

be substituted by electrical motors. Besides the batteries and the motor,

the powerelectronic devices are important parts in an EV, especially the inverter. This

ac/dc power converter drives the electrical motor. Several tools may be needed to achieve an

optimal design of the inverter. This paper presents a simplified methodology to

estimate power losses in a two-level inverter made up with isolated gate bipolar transistors

(IGBTs). This methodology is based on the IGBT manufacturer datasheet; therefore, the


http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=5942269&contentType=Conference+Publications&ranges%3D2011_2011_p_Publication_Year%26queryText%3Dpower+electronics+in+matlab





CONTACT NO.: 91-9176696486.


knowledge of internal parameters used in other more complex methodologies is not required.

The model is implemented inMatlab-Simulink and allows simulation of different powerdevices,

modulation techniques, and operating conditions very easily. Some results are obtained and

validated with commercial electronic software and also with the simulation tool Semisel,

provided by the manufacturer of the IGBTs.

DESIGN AND IMPLEMENTATION OF AN ELECTRIC DRIVE

SYSTEM FOR IN -WHEEL MOTOR ELECTRIC VEHICLE

APPLICATIONS

ABSTRACT :

This paper presents the design and application of a hub drive system for Hybrid (HEV)

and All Electric Vehicles (EV). Initially Matlab SIMULINK model of a hub driven hybrid


http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6043070&contentType=Conference+Publications&ranges%3D2011_2011_p_Publication_Year%26pageNumber%3D2%26queryText%3Dpower+electronics+in+matlab





CONTACT NO.: 91-9176696486.


electric vehicle is developed and the performance values are calculated. Two 15 kW brushless dc

machines (BLDC) are designed and manufactured to be located inside the rim of the wheels. The

performance tests of these wheels are conducted in laboratory environment. Then, two separately

driven rear wheels are mounted to Fiat Linea vehicle. The mechanical differential is replaced by

an electronic control technique, which bases upon the detection of the angle of steering wheel. A

CAN bus communication is established between the control system of electric drive

and ElectronicControl Unit (ECU) of the vehicle. The concerted action between electrically

driven rear-wheels and Internal Combustion Engine (ICE) driven front axle is achieved. Finally

some preliminary road tests are executed and encouraging test results are obtained. The design

optimizations between ICE, Electric Drive and Battery Powerfor various drive cycles are

investigated.

SIMULATION FOR SVPWM INVERTER-SMITH SINGLE-

PHASE MOTOR SPEED CONTROL

ABSTRACT :






CONTACT NO.: 91-9176696486.


The transient performance of Smith single phase motor supplied by the single phase

SVPWM voltage source inverter is studied emphatically. And then, voltage space vector of the

single phase whole-bridge inverter is analyzed and the SVPWM whose control algorithm is

deduced. Meanwhile, a transient mathematical model for the Smith single phase motor is

developed. Moreover, a simulation model of variable frequency speed control system of single

phase SVPWM inverter-Smith single phase motor is built byMATLAB/SIMULINK. Finally, by

the simulation calculated to the actual case, the result is consistent with the theoretical analysis.

Thus, it would be of a certain practical significance and reference value in the design of SVPWM

inverter and speed control system of tri-winding single- phase condenser motor.




CONTACT NO.: 91-9176696486.


A NOVEL WIND ENERGY CONVERSION SYSTEM

WITH POWER QUALITY IMPROVEMENT FEATURES

ABSTRACT :

This paper focuses on design and simulation of a novel small scale Wind Energy

Conversion System (WECS) based on Permanent Magnet Generators (PMGs)

and power electronicconverters. Electric power is generated using a PMG whose output is having

variable magnitude and variable frequency due to non-uniform wind velocity. In the proposed

system output of PMG is converted to constant DC using a full bridge rectifier and closed loop

boost converter. This constant DC output is converted to AC using Three Bridge Four Wire

(TBFW) interfacing inverter. One of the most common problems when connecting small

renewable energy systems to the electric grid concerns the interface unit between

thepower sources and the grid, as it can inject harmonic components that may deteriorate

the power quality. The TBFW inverter can perform as a conventional inverter as well as an

active power filter by means of hysteresis current controller. The inverter can thus be utilized as

a powerconverter injecting power generated from renewable energy source to the grid and as a

shunt active power filter to compensate for power quality disturbances and load

reactive power demand. Validation of the proposed system is verified

through MATLAB/Simulink simulation.






CONTACT NO.: 91-9176696486.


A NEW MATRIX CONVERTER BASED THREE PHASE

BRUSHLESS DC MOTOR DRIVE

ABSTRACT :

This paper presents a novel matrix converter based drive technique for three phase

brushless DC (BLDC) machines. Incontrast to existing matrix converter based drives, the

proposed technique uses a topology that has less number of semiconductors and a unique

switching sequence to drive three phase BLDC machines directly from single phase mains

supply lines without a DC link capacitor. The paper describesin detail both the topology and the

unique switching sequence that is essential for the proposed technique. A model based

on Matlab/Simulink is also presented to demonstrate the theoretical performance of the proposed

drive system. The performance of the technique is evaluated using a model of 320 W BLDC

machine, which is operated inboth torque and speed control modes, and simulated results

indicate that the performance of the machine is comparable to existing techniques. The proposed

technique is simple to implement, cost effective with low component count, and can be easily

adapted to applications such as PM synchronous motor drives or loads, which require a single to

3-phasepower conversion.






CONTACT NO.: 91-9176696486.


REAL-TIME LOAD COMPENSATION BY USING A

CASCADED MULTILEVEL INVERTER-BASED STATCOM

ABSTRACT :

A delta-connected static synchronous compensator (STATCOM) is proposed for real-time load

compensation of unbalanced load. The structure of the STATCOM is a multilevel cascaded full

H-bridge inverter which is suitable for high-voltage, high-power applications. First, use of the

symmetrical components method derives the control algorithm of the STATCOM. The

STATCOM is then built in theMatlab/Simulink environment. Finally, simulation results indicate

that the proposed delta-connected STATCOM is effective for real-time load compensation of

unbalanced loads.






CONTACT NO.: 91-9176696486.


MODELING AND CONTROL OF DIRECTLY CONNECTED

AND INVERTER INTERFACED SOURCES IN A MICROGRID

ABSTRACT :

There has been a keen interest on Distributed Generation (DG) due to their restricted

goals of meeting local loads and improving reliability of the overall system. Microgrids (MGs)

are connected to the main grid through a Point of Common Coupling which separates the former

from the latter. At the time of an intentional islanding or fault at the grid level, a microgrid is

able to disconnect itself from the rest of the grid and operate by itself. A microgrid may contain

both directly connected and inverter interfaced sources with different control configurations.

When disconnected or islanded from the main grid there are various approaches to share the

load, one of them being master-slave control where a storage device may become the reference






CONTACT NO.: 91-9176696486.


DG to set the nominal voltage and frequency. When the main grid is brought back to normal

operation, the microgrid is able to resynchronize itself to the main grid only when it meets

certain conditions so as to avoid transients. All the micro sources, power electronics and their

control with power management were developed in Matlab/Simulink.

MODELING AND ANALYSIS OF AN ELECTRONIC LOAD

SENSING PUMP

ABSTRACT :

This paper describes the modeling and analysis of the dynamics of an electronic load

sensing hydraulic system consisting of a load sensing pump, a flow control valve, a hydraulic

cylinder and an effective mass representing the linkage inertia. Load sensing hydraulic circuits

are prone to instabilities and frequently require hydraulic filters in the form of orifices and

control volumes to remove unwanted oscillations. Closed loop controllers for such systems are






CONTACT NO.: 91-9176696486.


difficult to design due to the nonlinearities and high order transfer functions. In this paper a

linear model is derived from equations of motion, and validated against a nonlinear simulation

model based on MATLAB. Then, a third order model is derived that can be used for controller

design.

A NOVEL TEMPERATURE ESTIMATION METHOD FOR

SOLAR CELLS

ABSTRACT :






CONTACT NO.: 91-9176696486.


In this paper, an effective approach for estimating the operating temperature of a

photovoltaic (PV) module is presented. The developed method is simple and does not need any

additional hardware. The proposed approach uses an analytical formula to derive the temperature

from the maximum power point (MPP) voltage and current. The effectiveness of the new method

is investigated through some conducted simulations in MATLAB/Simulink environment and its

validity is verified by experiment on REC-AE220 solar modules.




CONTACT NO.: 91-9176696486.


A NEW BOOST TYPE CASCADED INVERTER WITH SINGLE

DC SOURCE

ABSTRACT :

Cascaded multilevel inverters with Y connection or Delta-connection have been proposed

for high voltage applications. However, these topologies always require isolated transformers for

each inverter cell, which makes cost high and wiring complex. Furthermore, system weight and

volume also increase accordingly. This paper presents two new types of boost type delta-

connection cascaded inverters with only a single DC source. Based on it, a suitable voltage

control with PWM modulation is also proposed to improve the inverter control performance and

DC capacitors voltage fluctuation. Verification has been carried out by simulation

with MATLAB.


matlab 2012 ieee projects

Education

power systems

power qualityimprovement

reactive power

poor quality of power

needed active power

power electronic converters

power factor correction

poor quality power supply