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In case of sinusoidal pulse width modulation with MI < 1, if the number of pulses per half cycle (N) = 5, then

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in Power Electronics by (27.1k points)
In case of sinusoidal pulse width modulation with MI < 1, if the number of pulses per half cycle (N) = 5, then

(a) harmonics of order 5 and 7 become significant

(b) harmonics of order 5 and 7 are eliminated

(c) harmonics of order 9 and 11  become significant

(d) harmonics of order 9 and 11 are eliminated

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Question is taken from PWM Inverters-4 in portion Inverters of Power Electronics

1 Answer

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by (45.1k points)
Correct choice is (c) harmonics of order 9 and 11  become significant

Best explanation: For MI less than one, largest harmonic amplitudes in the output voltage are associated with harmonics of order 2N (+/-) 1. Thus, by increasing the number of pulses per half cycle (N), the order of the dominate harmonic can be raised, which can be filtered out easily.

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