Abstract
Hybrid parallel DC transmission system has both flexible control characteristics of MMC-HVDC and large capacity transmission capacity of LCC-HVDC, which has good economy and practicability. However, the connection of hybrid parallel DC transmission system will bring a series of harmonic problems, so harmonic suppression measures must be taken. This paper firstly introduces the generation mechanism and basic characteristics of LCC-HVDC characteristic and non-characteristic harmonics. Then the causes of MMC-HVDC circulation are analysed. Finally, based on the parallel connection of LCC-HVDC and MMC-HVDC in the same AC bus, a harmonic co-suppression strategy of hybrid parallel DC transmission system is proposed and the simulation verification is carried out. The results show that the strategy can use MMC-HVDC to assist in absorbing the harmonics generated by LCC-HVDC.
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