Multilevel Inverter Simulation Using Psim

8/13/2019 Multilevel Inverter Simulation Using Psim

1/41

Simulation of Multilevel Inverter

Using PSIM

Darshan.S.Patel

M.Tech (Power Electronics & Drives)

Assistant Professor

Department of Electrical EngineeringSankalchand Patel College of Engineerig-Visnagar

E-mail:[email protected]

URL:www.darshanspatel.weebly.com


2/41

Why Multilevel Inverter?

The Voltage source Inverters Produce an output voltage or a

current with level either 0 or Vdc,known as two level inverter.

Two obtain a quality output voltage waveform with minimum

amount of ripple content, they require high switching frequency

along with various PWM Techniques.


3/41

This two level inverters have some limitations

in operating at high frequency mainly due to

switching losses and constraints of device

ratings.Multilevel inverter present a new set of

features that are well suited for use in reactive

power compensation.

It is east to produce high power, high voltage

with the multilevel structure.


4/41

Two Level

Three Level


5/41

Multilevel Inverter Topologies

Neutral point clamped or Diode clamped

topology.

Cascaded H-Bridge topology.

Flying capacitor or Capacitor clampedtopology.


6/41

Diode Clamped Inverter

m-level inverter con sists of

For Single Phase:

(m-1) capacitors

2(m-1) Switching devices

(m-1)(m-2) clamping diodes


7/41

Three Phase Three Level Diode Clamped Inverter


8/41

Simulation of Diode Clamped Inverter


9/41


10/41

ComponentsTool Box /

Library browserBlock Parameters

Input Voltage Elements /Sources/Voltage DC voltage source Amplitude =100

Power Switch Elements Power/Switches IGBT Default

Sinusoidal Wave

1/2/3 Elements /Sources/Voltage Sine

Peak Amplitude = 0.8

Frequency = 50

Phase angle = 0,-120,-240

DC offset = 1

Triangular Wave 1,3,5Elements /Sources/Voltage Triangular

V peak to peak = 1

Frequency = 2000

Duty cycle = 0.5

DC offset = 1Phase Delay = 0

Triangular Wave 2,4,6Elements /Sources/Voltage Triangular

V peak to peak = 1

Frequency = 2000

Duty cycle = 0.5

DC offset = 0

Phase Delay = 0

Load Elements/ Power/RLC Branches Resistor Resistance(Ohm) =20k

Inverter Elements /Controls/Logic Elements NOT Gate Default

On control Elements/Others/ Switch

controllers ON OFF Controller Default

Comparator Elements /Controls/Comparator Comp Default


11/41


12/41

Full Bridge Inverter


13/41

SPWM


14/41


15/41

Cascaded H Bridge Inverter

Each H-bridge must have an isolated DC supply -usually derived from an

isolated AC supply via a diode bridge

Each bridge can produce +Vdc, 0, -Vdc independently


16/41

Three Phase Three Level Inverter


17/41

17

One phase of cascaded H bridge inverter consists of3-1/2 = 2/2 = 1 Identical H Bridges

Phase-A


18/41

18

Three-level inverter needs both a carrier and a reference. Inthis case the number of triangular carriers is equal to m-1,where

m is the number of voltage levels.

For a three-phase three-level inverter this means that twotriangular carriers and one sinusoidal reference are needed.

Phase shifting on any two adjacent carrier waves is given by

cr= 360/(m 1)

= 360/(3-1)

= 360/2

= 180


19/41

19

Simulation of Three Phase Three Level CHB Inverter

Cascaded H bridge Inverter

PWM Controller

Load


20/41

Components Tool Box /

Library browser

Block Parameters

Sinusoidal Wave

a/b/c

Elements /Sources/Voltage Sine Peak Amplitude = 0.8

Frequency = 50

Phase angle = 0/120/240

DC offset = 0

Triangular Wave 1/2 Elements /Sources/Voltage Triangular V peak to peak = 1

Frequency = 2000

Duty cycle = 0.5

DC offset = -1/0

Phase Delay = 0/180


Frequency = 2000

Duty cycle = 0.5

DC offset = -1/0

Phase Delay = 120/300


Frequency = 2000

Duty cycle = 0.5

DC offset = -1/0

Phase Delay = 240/60


21/41

21


22/41

22

Gate Pulses


23/41

23


24/41

Carrier Based PWM Schemes

It classified into two categories

1.Phase Shifted Carrier PWM method (PSPWM)

2. Level Shifted PWM methods

In Phase Disposition (IPD)

Alternative Phase Opposition Disposition

(APOD)

Phase Opposition Disposition (POD)


25/41

25

Phase Shifted ModulationTriangular carriers required

m-1=6

where m= voltage level

All the triangular carriers have

the same frequency and the same

peak to peak amplitude.

There is a phase shift between

any two adjacent carrier waves,

given by

cr= 360/(m

1)

Here cr= 360/6

= 60


26/41

26


27/41

27


28/41

28

ate Pulses for Upper Switches


29/41

29


30/41


31/41

31

evel Shifted Modulation(A) In Phase Disposition (IPD)


32/41

32


33/41

33

Line to neutral Voltage waveform(Van)


34/41

34

(B) Phase Opposition Disposition (POD)


35/41

35


36/41

36



37/41

37

(C) Alternate Phase Opposition Disposition


38/41

38


39/41

39



40/41

1.Jos Rodrguez, Jih-Sheng Lai, and Fang Zheng Peng, MultilevelInverters: A Surveyof Topologies, Controls, and Applications,IEEE Transactions on Industrial Electronics,

Vol. 49, No. 4, August 2002, pp.724-738.

2.Darshan Patel ,Dr. R Saravanakumar, Dr K.K.Ray, R.Ramesh A Review of Various

Carrier Based PWM Methods for Multilevel Inverter ,IICPE 2010,India International

conference on Power Electronics .January 28-30,2011,at Netaji Subhas Institute of

Technology-New Delhi by IEEE Power Electronics Society and this Paper Published in

IEEE Explore Digital Library INSPEC Accession Number: 11873778, Digital Object

Identifier:10.1109/IICPE.2011.5728059

3.Darshan Patel, Dr. R Saravanakumar, Dr K.K.Ray, R.Ramesh Design and

Implementation of three Level CHB inverter with phase shifted SPWM using

TMS320F24PQ, IICPE 2010, India International conference on Power Electronics.January 28-30,2011,at Netaji Subhas Institute of Technology-New Delhi by IEEE Power

Electronics Society and this Paper Published in IEEE Explore Digital Library INSPEC

Accession Number: 11873860, Digital Object Identifier:10.1109/IICPE.2011.5728
http://dx.doi.org/10.1109/IICPE.2011.5728059http://dx.doi.org/10.1109/IICPE.2011.5728059http://dx.doi.org/10.1109/IICPE.2011.5728059http://dx.doi.org/10.1109/IICPE.2011.5728059


41/41

Documents

Multilevel Inverter Simulation Using Psim