This document summarizes Preetam Jadhav's final seminar presentation on voltage source inverters. The presentation covers types of inverters including current source inverters and voltage source inverters. It then discusses different types of voltage source inverters such as multilevel diode neutral point clamped inverters and cascaded H-bridge inverters. The presentation also examines control systems, filter types, modulation schemes and excitation modes for voltage source inverters. Finally, it reviews conclusions and references presented in the seminar.

1. Welcome

2. Dr.Budhajirao Mulik College Of Agricultural Engineering
And Technology
Mandki-Palvan
Final Seminar
On
Stimulation Of Voltage Source Inverter
Presented By,
Jadhav Preetam Waman
ENMPU150745

3. POINTS TO BE COVERED
 Introduction
 Types of Inverters
 Types of VSIs
 Control Systems
 Types of Filters
 Modulation Schemes
 Modes of Excitation
 Summery

4. INTRODUCTION
 Distributed generation is an alternative source
 Sensible solution
 Conversion of DC to AC
 VSIs for commercial as well as industrial purpose
 Smooth and steady waveform

5. INVERTER
 Types of inverter
 Current source inverter
 Voltage source inverter
 Z-source inverter

6. DIFFERENCE BETWEEN VSIS AND CSIS
VSIs CSIs
VSI is fed from a DC voltage
source having small or negligible
impedance
CSI is fed with adjustable current
from a DC voltage source of high
impedance
Input voltage is maintained
constant
The input current is constant
Inductors are used Capacitors are used
VSI requires feedback diodes CSI does not require any feedback
diodes

7. TYPES OF VSIS
 Multilevel diode neutral point clamped inverter
 Multiple capacitor clamped inverter
 Cascaded H-Bridge inverter
 Two level three phase VSIs
 Three phase Four-leg VSIs

8. MULTILEVEL DIODE NEUTRAL POINT CLAMPED
INVERTER
 Features four switches and six diodes
 The semiconductors are clamped to the neutral point
 DC is converted into AC
 Use of half bride stimulates the voltage
 Mainly used in three phase PV inverters or UPS
NPC

9. MULTIPLE CAPACITOR CLAMPED INVERTER
 Consist of diodes, capacitors and switching devices
 Each leg consist of switching device
 Limbs consist of cells connected in series
 Each cell consist of two switch and a capacitor
 Capacitor float due to potential

10. CASCADED H-BRIDGE INVERTER
 Used for single phase as well as three phase inverter
 A H-bridge is used consisting combination of switches
and diodes
 Each cell consist of four switch and four diodes

11. TWO LEVEL THREE PHASE VSIS
 Coverts DC to AC
 It consist of six switches or MOSFETs
 These are generally connected in grid with output filters
such as LC or LCL filters

12. THREE PHASE FOUR-LEG VSIS
 Similar as two level three phase VSIs
 Consist of 8 switches or MOSFETs
 An extra leg is introduced from a pair of switch which
acts as a neutral
 These are generally connected in grid with output filters
such as LC or LCL filters

13. CONTROL SYSTEMS
1. Analog control System
• Representation of time is assumed to have infinite
precision
• Designed without using computers, microcontrollers
or any program
• Capacitors are generally used
• Slow processing speed

14. 2. Digital Control System
• Digital signals are analyzed
• Needs finite precision and extra attention
• Digital controller are implemented
• Relatively easier using software
(IEEE Trans. Power Electron. 2013)

15. TYPES OF FILTERS
 L - Filter

16.  LC Filter

17.  LCL Filter

18. MODULATION SCHEMES
 Triangular Comparison Based PWM
 Space Vector Based PWM
 Voltage Look-up Table Based PWM

19. MODES OF EXCITATION
1. 36˚
2. 72˚
3. 108˚
4. 144˚
5. 180˚
6. 216˚
7. 252˚
8. 288˚
9. 324˚
10. 360˚

20. CONCLUSION
 Several new hybrid topologies can be designed through
the combinations of three main MLI topologies
 PWM strategies that generate switching frequency at
fundamental frequency are also introduced the switching
devices of the higher voltage modules to operate at high
frequencies

21. REFERENCES
 Blaabjerg et al.(2006) Overview of control and grid
synchronization.
 Liang et al.(2009) four-wire inverters.
 Miret et al.(2013) Control scheme with voltage support
capability.
 M.A Inayathullaah (2014) Stimulation of five phase
inverter
 Patel et al.(1973) Generalized techniques of harmonic
elimination.
 Rodriguez et al.(2002) Multilevel inverters, IEEE Trans.
Ind. Electron

22. THANK YOU