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A modified parallel HVDC convertor for 24 pulse operation

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2 Author(s)
Arrillaga, J. ; Canterbury Univ., Christchurch, New Zealand ; Villablanca, M.

A new concept in power convertor design suitable for large current ratings, such as those used in back-to-back HVDC interconnections, is proposed. It consists of a parallel 12-pulse configuration involving two phase-shifted bridges and a thyristor-tapped interphase reactor. The DC ripple present across the interphase reactor is used to derive a current waveform which, when added to the original phase currents, effectively doubles the converter's pulse number. It is shown theoretically and experimentally that the use of DC-ripple reinjection achieves 24-pulse operation from a conventional 12-pulse HVDC converter configuration

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Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 1 )