www.stmjournals.comSTM JOURNALSScientific Technical Medical

Journal of

May-August 2014

ISSN: 2321-4244

Power Electronics & Power Systems

JoPEPS

üDesign and Simulation of IRFOC

üMitigation of Flicker & Harmonics in Grid Connected DFIG

üSingle-Input Fuzzy Logic Controllers for Separately Excited DC Motor

üTime and Frequency Response of Transformer Windings

üControl of Induction Motor Drive

üEvaluation of Reliability in Five-Phase Induction Motor

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Power Electronics & Power Systems. The intension of JoPEPS is to create an atmosphere that

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Systems.

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Dr. Archana Mehrotra

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Director's Desk

STM JOURNALS

1. Design and Simulation of IRFOC for SPWM Inverter-fed Induction Motor Considering Core Loss and Stray Load Loss Mohammad Abdul Mannan, Md. Ehtashamul Haque, Rupak Kanti Dhar 1

2. Mitigation of Flicker and Harmonics in Grid Connected DFIG for Power Quality Improvement Sanjeev Kumar Bhalla, R. K. Jarial, Y.R. Sood 12

3. Single-Input Fuzzy Logic Controllers for Efficiency Maximized Separately Excited DC MotorMohammad Abdul Mannan, Toshiaki Murata, Junji Tamura 24

4. The Time and Frequency Response of Shielded Transformer WindingsMohamed M. Saied 33

5. Direct Power Control of Induction Motor DriveAbolfazl Halvaei Niasar, Hossein Rahimi Khoei 48

6. Evaluation of Reliability in Five-Phase Induction Motor Operated at Low Speed by V/F Control Method using FPGAManjesh 56

ContentsJournal of Power Electronics & Power Systems

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print)

Volume 4, Issue 2

www.stmjournals.com

Design and Simulation of IRFOC for SPWM

Inverter-fed Induction Motor Considering Core

Loss and Stray Load Loss

Mohammad Abdul Mannan, Md. Ehtashamul Haque*, Rupak Kanti Dhar Department of Electrical and Electronic Engineering, American International University-Bangladesh,

Kemal Ataturk Avenue, Banani, Dhaka-1213, Bangladesh

Abstract The principle of field oriented control (FOC) or vector control (VC) of induction motors

(IMs) is based on the control of both the magnitude and the phase of each phase current

and voltage to achieve the decoupling control strategies between flux and torque. To control the flux and the torque precisely based on the FOC, core losses (CL) and stray

load losses (SLL), which are generally neglected, should be considered in the mathematical model of IM to design the controller. In order to achieve the precise flux

and torque control of IM, some of literatures have proposed to detuning method for FOC

of IM to compensate the effects of CL and SLL. But it has seen that the mathematical modeling of detuning process is very complex which makes the complexity in the case of

implementation also. In this paper, a novel FOC of IM with consideration of both CL and

SLL is proposed. In this novel FOC of IM includes the decoupling control strategy which is easier than the detuning strategy. The effectiveness of proposed FOC of IM considering

CL and SLL has been verified by the simulation work which has been done by using Matlab/Simulink. The simulation results show that the speed control with decoupling of

flux and torque control for high performance of IM with considering CL and SLL based

the proposed FOC can be achieved.

Keywords: Induction motor, Core loss, Stray Load loss, Field-oriented control,

PI controller

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print)

Volume 4, Issue 2

www.stmjournals.com

Mitigation of Flicker and Harmonics in Grid Connected

DFIG for Power Quality Improvement

Sanjeev Kumar Bhalla1*, R. K. Jarial

2, Y.R. Sood

2

1School of Electronics & Electrical Engineering, Lovely Professional University, Phagwara,

Punjab, India 2Department of Electrical Engineering, National Institute of Technology, Hamirpur, India

Abstract This paper focuses on the mitigation of voltage harmonics and flicker of a grid connected

doubly fed induction generator for wind energy conversion system. The harmonics have

been mitigated by an active series filter and flicker levels have been minimized by optimal control of wind turbine output reactive power. The effectiveness of the proposed

mitigation strategies has been analyzed for various grid conditions and different wind speeds. The flicker levels and voltage harmonics have been successfully reduced as per

prescribed standards. The proposed system thus ensures that voltage impurity is not

passed on to the grid and high power quality is maintained.

Keywords: Doubly Fed Induction Generator (DFIG), Wind Energy Conversion

Systems (WECS), Power Quality (PQ), Active Series Filter (ASF), Pulse Width

Modulation (PWM), Point of Common Coupling (PCC)

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics and Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print)

Volume 4, Issue 2

www.stmjournals.com

Single-Input Fuzzy Logic Controllers for Efficiency

Maximized Separately Excited DC Motor

Mohammad Abdul Mannan1*, Toshiaki Murata

2, Junji Tamura

2

1Dept. of EEE, American International University – Bangladesh, 83/B Road 14 Kemal Ataturk

Avenue, Banani, Dhaka, Bangladesh 2Dept. of EEE, Kitami Institute of Technology, 165Koen-cho, Kitami, Hokkaido, Japan

Abstract In this paper, three single-input fuzzy logic controllers are designed to control field

current, armature current and speed of efficiency maximized separately excited DC

motor. The necessary of field controller is to maximize the efficiency by tracking the optimized field current for different operating points. In contrary to the conventional

fuzzy logic controller which requires at least two inputs variables and nine rules, the

proposed controller requires one input and seven rules. However, the performance of the controller is not degraded. The proposed single-input fuzzy logic controllers can be

realized by using a simple look-up table which makes faster fuzzy calculation even using an inexpensive digital processor. Using the Matlab/Simuink simulations, it can be shown

that the proposed controller exhibits good performance by reducing the steady-state

error, and overshoot problems and robustness under the variation of load torque.

Keywords: Single-input fuzzy logic controller, efficiency maximization, field current

controller, armature current controller, speed controller, separately excited DC

motor

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics & Power Systems ISSN: 2249-863X(online), ISSN: 2321-4244(print)

Volume 4, Issue 2

www.stmjournals.com

The Time and Frequency Response of Shielded

Transformer Windings

Mohamed M. Saied* IEEE Senior Member, Professor (Emeritus), Independent Researcher, Giza, Cairo, Egypt

Abstract A distributed-parameter model is presented for the transient and frequency analysis of

power transformers’ windings in the presence of electrostatic shielding, a technique occasionally applied for improving their initial voltage distribution. The s-domain

solution takes into account the windings’ circuit parameters with special emphasis on the

additional distributed capacitances between the windings’ conductors and the conducting

shield which is connected to the windings’ line terminal. The closeness of the resulting

initial voltage profile to the ideal case of uniform distribution is suggested as a criterion for assessing the achieved improvement in the windings’ voltage stresses. This leads to

the determination of the optimal shielding arrangement. The sensitivity of the modified initial and transient responses to step and double-exponential voltage stimuli is

investigated. Moreover, the resulting change in the windings’ series and parallel

resonance frequencies is also addressed.

Keywords: Power transformers, equivalent circuit, power system transients,

transformer winding, shielding, distributed parameters, initial voltage distribution,

high-frequency model, frequency response, resonance

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics & Power Systems ISSN: 2249-863X (online), ISSN: 2321-4244 (print)

Volume 4, Issue 2

www.stmjournals.com

Direct Power Control of Induction Motor Drive

Abolfazl Halvaei Niasar*, Hossein Rahimi Khoei

Department of Electrical & Computer Engineering, University of Kashan, Kashan, Iran

Abstract Different variable frequency strategies have been developed for control of induction motors

including V/f scalar control; field oriented control (FOC), and direct torque control (DTC). Recently, direct power control (DPC) has been developed to control dual-fed induction

generators (DFIGs) and permanent magnet synchronous generators (PMSGs). In this paper, DPC is employed for speed control of induction motors fed by a voltage source

inverter. DPC is basically similar to DTC method in structure and response. Moreover, the

measuring of feedback power is easier than prediction of feedback torque in DTC and there is no need to model parameters of the motor. Simulation results are presented in order to

demonstrate the effectiveness of the proposed DPC technique.

Keywords: Induction motor drive, speed control, direct power control, hysteresis

control

JoPEPS (2014)© STM Journals 2014. All Rights Reserved

Journal of Power Electronics & Power Systems ISSN: 2249-863X (online), ISSN: 2321-4244 (print)

Volume 4, Issue 2

www.stmjournals.com

Evaluation of Reliability in Five-Phase Induction Motor

Operated at Low Speed by V/F Control Method

using FPGA

Manjesh* Department of Electronic Science, Bangalore University, Bangalore, Karnataka, India

Abstract This paper presents the study of performance and reliability evaluation of five-phase

induction motor by finding various parameters in the induction motor. Induction motors have increased demand for low cost and size, simple construction, least maintenance,

operational simplicity and brush-less construction with cage rotor. Industrial applications demand high efficiency, and reliable and long life-time electrical machines.

The fault modes of induction machines are very complex; many researchers are plagued

to find fault evidences for reliability verifications. The reliability evaluation has been studied with various parameters, like efficiency, line current, working of motor with

variable voltage with fixed frequency and measurement of torque at various loads.

Harmonics have major effect on reliability of the motor, because the heat generated in the five-phase induction motor due to harmonics [1, 2] leads to probability of failure in

the induction motor. The temperature at various parts of the five-phase induction motor has been estimated experimentally to evaluate the reliability of the Induction motor

presented in this paper.

Keywords: Five phase, conduction mode, induction motor drive, PWM, EMI