open end winding based multilevel inverter

1. 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

2. 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
2OPEN END WINDING BASED MULTILEVEL INVERTER

3. 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.
3OPEN END WINDING BASED MULTILEVEL INVERTER

4. 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.
4OPEN END WINDING BASED MULTILEVEL INVERTER

5. 2-LEVEL INVERTER
5OPEN END WINDING BASED MULTILEVEL INVERTER

6. 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.
6OPEN END WINDING BASED MULTILEVEL INVERTER

7. 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.
7OPEN END WINDING BASED MULTILEVEL INVERTER

8. CONTD…
Can generate multiple-step voltage waveform.
No.of level = no.of voltage values generated by
inverter.
Multilevel voltage source inverter are used in variable
speed drives.
8OPEN END WINDING BASED MULTILEVEL INVERTER

9. 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)
9OPEN END WINDING BASED MULTILEVEL INVERTER

10. BASIC CIRCUIT DIAGRAM
10OPEN END WINDING BASED MULTILEVEL INVERTER

11. 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.
11OPEN END WINDING BASED MULTILEVEL INVERTER

12. 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
12OPEN END WINDING BASED MULTILEVEL INVERTER

13. 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
13OPEN END WINDING BASED MULTILEVEL INVERTER
Let us consider the states of phase leg A and 𝑨′

14. OPEN END WINDING BASED MULTILEVEL INVERTER 14
BLOCK DIAGRAM

15. COMPONENTS USED
IGBT MODULE-SKM100GB128D ADAPTER BOARD
DRIVER CARD –SKYPER32R RECTIFIER MODULE
HEAT SINK COOLER FAN
METAL SHEET TRANSFORMER
15
OPEN END WINDING BASED MULTILEVEL INVERTER

16. ADAPTER BOARD
DRIVER CARD
IGBT MODULE
16OPEN END WINDING BASED MULTILEVEL INVERTER

17. 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
17OPEN END WINDING BASED MULTILEVEL INVERTER

18. APPLICATIONS
Motor drives
Electric vehicle drives
Industrial applications
Train traction
18OPEN END WINDING BASED MULTILEVEL INVERTER