GATE EE 2019 Set 1 — Question 19
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Power Electronics → AC-DC Converters → Controlled Rectifiers (3φ)
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Question
A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current is
Correct answer
(C) 250 Hz
Solution
For a six-pulse thyristor bridge rectifier, the harmonic orders present in the AC input current are given by:The harmonic orders are
The lowest harmonic order is .
The frequency of the harmonic is .
Given fundamental frequency .
Frequency of the lowest harmonic () = .
Therefore, option (C) is the correct answer.
The lowest harmonic order is .
The frequency of the harmonic is .
Given fundamental frequency .
Frequency of the lowest harmonic () = .
Therefore, option (C) is the correct answer.
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