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In a 3-phase VSI operating in square-wave mode, the output line voltage is free from

(a) 3rd harmonic

(b) 7th harmonic

(c) 11th harmonic

(d) 13th harmonic

I have been asked this question during an online interview.

I want to ask this question from Current Source Inverters in portion Inverters of Power Electronics

1 Answer

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by (45.1k points)
Right choice is (a) 3rd harmonic

Best explanation: The line voltage is the difference of two phase voltages, the 3rd harmonic gets cancelled out, though it is present in the phase voltages.

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