YANG Wenbo, SONG Qiang, LIU Wenhua, et al. Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter[J]. 2018, 44(7): 2205-2212.
YANG Wenbo, SONG Qiang, LIU Wenhua, et al. Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter[J]. 2018, 44(7): 2205-2212.DOI:
提出了一种使用新型的电流单向型MMC与LCC连接构成的混合直流输电系统。构建了单极800 k V/2 500 MW的双端系统模型
对其启动过程、典型故障过程和功率反转过程进行了仿真
结果表明提出的混合系统具有可行性、直流故障清除能力、短时无功支撑能力和双向功率传输能力。
Abstract
A hybrid high-voltage direct-current(HVDC) transmission system composed of line commutated converter(LCC) and modular multilevel converter(MMC) cannot clear a dc-side short fault if the half-bridge MMC is adopted
and has a high cost if the full-bridge MMC is adopted. We proposed a novel hybrid HVDC transmission system composed of LCC and unidirectional current H-bridge MMC in order to solve this problem. An 800 k V/2 500 MW unipolar two-terminal system model was built. The startup
typical faults
and power reversal processes were simulated. The results verify that the proposed hybrid system possesses the feasibility