In the HVDC system, the ac harmonics which gets effectively eliminated with 12 pulse bridge converters are

This question was previously asked in
UPPSC AE Electrical 2019 Official Paper I (Held on 13 Dec 2020)
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  1. Triplen harmonics
  2. Triplen and 5th harmonics
  3. Triplen, 5th and 7th harmonics
  4. 5th and 7th harmonics

Answer (Detailed Solution Below)

Option 4 : 5th and 7th harmonics
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In a HVDC system, 12 pulse bridge converters can eliminate 5th and 7th harmonics because the order of the harmonics for 6 – Pulse Bridge and 12 – pulse bridge converters are

(6 k ± 1) respectively.

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