A LCC and MMC hybrid HVDC topology with DC line fault clearance capability

Abstract This paper proposes a LCC and MMC hybrid HVDC topology with dc line fault clearance capability suitable for bulk power transmission, in which the rectifier adopts a line commutated converter (LCC) and the inverters adopt two modular multilevel converters (MMCs). Resiliency to dc line faults can be achieved by alpha-retard of the LCC and the high power diodes installed in the overhead line close to the inverters. The start-up process is implemented in two stages. A hybrid HVDC system is modeled in PSCAD/EMTDC to demonstrate the effectiveness of the control system and the start-up scheme. Moreover, simulation results of a dc line fault confirm the feasibility that the fault current paths can be blocked by alpha-retard of the LCC and the installed high power diodes, and the whole system is able to restart after clearance of the transient dc line fault.

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