3 Phase 120 Degree Mode Inverter using matlab simulink

180 Degree Conduction Mode Inverter using matlab simulink

Three-Phase 180 Degree Conduction Mode Inverter

A three phase 180 degree conduction mode bridge type inverter model built up of six MOSFETs, 450 V DC input Supply , Star connected 300 ohm load, six pulse generator,. In this inverter, each MOSFET conducts for 180 degree and hence it is known as three phase VSI.

 

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Angle (Degree)	ON Switches	OFF Switches
0°-60°	M1, M5, M6	M2, M3, M4
60°-120°	M1, M2, M6	M3, M4, M5
120°-180°	M1, M2, M3	M4, M5, M6
180°-240°	M2, M3, M4	M1, M5, M6
240°-300°	M3, M4, M5	M1, M2, M6
300°-360°	M4, M5, M6	M1, M2, M3

A period of 0.02 sec is taken so that the output voltage waveform is of frequency 50 Hz (T=1/f, i.e. 1/50=0.02). 

The pulse width of 50% is taken so that the MOSFET,  M1 conducts from 0 to 0.01 sec .i.e. 0 to 180 degree , as 0 to 0.02 sec is equivalent to 0 to 360 degree , the delay of 0.01 sec means 180 degree delay in electrical degree. 

Similarly the phase delay 

        for    G2 it is 0.01/3 sec, 
        for    G3 it is 0.02/3 sec, 
        for    G4 it is 0.01 sec. 
        for    G5 it is 0.04/3, and 

        for   G6 it is 0.05/3 sec 

And all other parameter kept same as of G1. 

The gate pulse of switches M1, M3, M5 are shown in fig . it can observed from these gate pulse that each switch conducts for 0.01 sec, i.e. 180 degree. 

Gate Pulse of M1, M2 and M3

The output voltage waveform of the three phases obtained after simulation the model is shown In  figure  . 

it can observer from figure that the first phase has phase angle of 0 degree , the second phase – 120 degree and third phase is 240 degree.

FFT Analysis

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Related Post – 

3 Phase 120 Degree Mode Inverter using matlab simulink

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