hardware implememtation of open end winding based multi level

HARDWARE IMPLEMENTATION OF

OPEN-END WINDING BASED MULTI

LEVEL INVERTER

GROUP MEMBERS

• DHANNYA

• GAYATHRI P V

• SRUTHI K BALAN

• SUVARNA T

SEMINAR GUIDE: CHANDINI. G S

ASST.SEMINAR GUIDE: Dr. SHINY G

COLLEGE OF ENGINEERING,TRIVANDRUM

1OPEN END WINDING BASED MULTILEVEL INVERTER

CONTENTS

AIM OF THE PROJECT

INTRODUCTION

2- LEVEL INVERTER

MULTILEVEL INVERTER AND FEATURES

MULTILEVEL INVERTER WITH OPEN-END WINDING INDUCTION MOTOR

BASIC CIRCUIT DIAGRAM

BLOCK DIAGRAM

COMPONENTS USED

ADVANTAGES

APPLICATIONS


AIM OF THE PROJECT

The objective of the proposed project is to realize an

open-end winding induction motor based multilevel

inverter.

To drive three phase induction motor using dual 2-level

inverters.


INTRODUCTION

What is an inverter?

Converts DC to AC power.

Vintage inverters realized with SCRs.

Nowadays BJT,MOSFET and IGBT replaced SCR.

Inverter does not produce any power, power is provided

by DC source.


2-LEVEL INVERTER


CONTD…

Switching devices of each phase leg are switched

complimentarily.

Pole voltages can assume two values (𝑉𝑑𝑐/2 and 0).

SPWM is most popular control scheme for 2-level

inverters.


MULTI LEVEL INVERTERS AND

FEATURES

MLI produces nearly sinusoidal output.

MLI controls lower order harmonics.

It is realized from number of smaller DC voltage sources.

Consists of power semiconductor and capacitive voltage sources.


CONTD…

Can generate multiple-step voltage waveform.

No.of level = no.of voltage values generated byinverter.

Multilevel voltage source inverter are used in variablespeed drives.


MULTILEVEL INVERTER WITH OPEN-

END WINDING INDUCTION MOTOR

Open-end winding is obtained by opening the neutral point of the stator windings.

Three-level inversion achieved by feeding the open-end winding from both sides with two 2-level inverters.

Two key techniques used as control scheme

1)Sine Triangle PWM (SPWM)

2)Space Vector PWM (SVPWM)


BASIC CIRCUIT DIAGRAM


CONTD…

It uses two 2-level inverters (inverter-1 and inverter-2).

If both the inverters are fed with symmetric DC link, the configuration will act as a 3-level inverter.

Each inverter is capable of assuming 8 states.

Total 64 space vector combinations are possible for dual inverter drive.


CONTD…

𝑉𝐴𝑂 , 𝑉𝐵𝑂 , 𝑉𝐶𝑂 − Pole voltages of Inverter-1.

𝑉𝐴′𝑂′,𝑉𝐵′𝑂′ , 𝑉𝐶′𝑂′ − Pole voltages of Inverter-2.

𝑉𝐴 𝐴′ ,𝑉𝐵 𝐵′ , 𝑉𝐶 𝐶′ − Phase voltages

Phase voltage = pole voltage of inverter 1- pole

voltage of inverter 2


STATE

ON

SWITCHE

S

OFF

SWITCHES

POLE

VOLTAGE

INVERTER-1

POLE

VOLTAGE

INVERTER-2

PHASE

VOLTAGE

1 𝑆4 , 𝑆1′ 𝑆1 , 𝑆4′ 0 𝑉𝑑𝑐/2 −𝑉𝑑𝑐/2

2 𝑆1, 𝑆4′ 𝑆4 , 𝑆1′ 𝑉𝑑𝑐/2 0 𝑉𝑑𝑐 /2

3 𝑆1, 𝑆1′ 𝑆4, 𝑆4′ 𝑉𝑑𝑐/2 𝑉𝑑𝑐/2 0


Let us consider the states of phase leg A and 𝑨′

OPEN END WINDING BASED MULTILEVEL INVERTER 14

BLOCK DIAGRAM

COMPONENTS USED

IGBT MODULE-SKM100GB128D ADAPTER BOARD

DRIVER CARD –SKYPER32R RECTIFIER MODULE

HEAT SINK COOLER FAN

METAL SHEET TRANSFORMER


ADAPTER BOARD

DRIVER CARD

IGBT MODULE


ADVANTAGES

By changing DC link , the topology will function as a 4-level inverter.

Intrinsically improved power quality

Lower voltage distortion

Reduced dv/dt

Lower common mode voltage


APPLICATIONS

Motor drives

Electric vehicle drives

Industrial applications

Train traction


hardware implememtation of open end winding based multi level

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