[Solved] Illustrate with neat waveform the effect of single commutation – Electrical Engineering And Electronics (MUM-CHEMENG-024)

Single Commutation Failure

A single commutation failure occurs when the current in a phase of the converter fails to commutate properly from one device to another. This results in a distorted output voltage waveform. The waveform for a single commutation failure typically shows a sudden change in the voltage level at the point of failure.

Time	Voltage Waveform
T1	Normal voltage
T2	Sudden drop in voltage due to commutation failure
T3	Recovery to normal voltage

Double Commutation Failure

A double commutation failure happens when two consecutive commutations fail, leading to a more severe distortion in the output voltage waveform. The waveform for a double commutation failure shows two successive sudden changes in the voltage level.

Time	Voltage Waveform
T1	Normal voltage
T2	Sudden drop in voltage due to first commutation failure
T3	Further drop in voltage due to second commutation failure
T4	Recovery to normal voltage

These waveforms illustrate the impact of single and double commutation failures on the output voltage of a converter.