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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 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 .
FFT Analysis
Related Post –
3 Phase 120 Degree Mode Inverter using matlab simulink
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