Series Connection of <scp>LCC</scp> and Full Bridge <scp>MMC</scp> With <scp>DC</scp> Fault Ride‐Through Capability for Lightweight <scp>HVDC</scp> Transmission

ABSTRACT To address the challenges associated with the high cost and large footprint of high‐voltage direct current (HVDC) stations, this paper proposes a lightweight converter topology based on a hybrid configuration of a line‐commutated converter (LCC) and a modular multilevel converter (MMC) with full‐bridge submodules. In the proposed scheme, the LCC is primarily responsible for active power transmission, while the MMC provides reactive power support and harmonic filtering, thereby fully leveraging the complementary advantages of both converters. The LCC operates under dc current control with a minimum firing angle strategy, whereas the MMC functions in STATCOM mode with active filtering capabilities. Under DC fault conditions, both converters are capable of reducing their dc output voltage to zero without pulse blocking, thereby achieving dc fault ride‐through. The performance of the proposed topology is validated through real‐time simulation.