This paper proposes a characteristic harmonics suppression strategy for the LCC-MMC based HVDC system using the MMC. Firstly, the topology of the LCC-MMC based HVDC system is introduced, in which the sending end converter station adopts the LCC-MMC hybrid converter valves despite of the structure of receiving end converter. Secondly, in the outer voltage loop of the MMC, high pass filters, band pass filters, and notch filters are used to extract the characteristic harmonics of the LCC converter for performance comparison, and they are reverse superimposed onto the reference current. In the inn...
