多馈入直流输电系统换相失败研究综述

常规高压直流输电系统存在换相失败的风险。对于多馈入直流输电系统而言，由于各交直流系统间的互相作用影响，单个直流回路发生换相失败可能会引起多条直流回路同时或者相继发生换相失败，给电网的安全稳定运行带来威胁。从换相失败的机理出发，引入多馈入交互作用因子来分析多馈入直流输电系统发生换相失败的影响因素和判据，总结了目前抑制换相失败的手段和策略，最后指出了在数学模型、换相失败耦合机理和抑制措施方面值得更深入的探讨和研究。

Research on Commutation Failure in Multi-feed HVDC Transmission System

HVDC transmission systems present a risk of commutation failure. For multi-infeed HVDC transmission systems, due to the interaction between AC and DC systems, the commutation failure of a single inverter station may cause multiple inverter stations to fail at the same time or in succession, which poses a threat to the safe and stable operation of the power grid. Based on the mechanism of commutation failure, the multi-infeed interaction factor was introduced to analyze the influencing factors and criteria of commutation failure in multi-infeed HVDC transmission systems, and the current methods and strategies for suppressing commutation failure were summarized. Finally, it pointed out that the mathematical model, the commutation failure coupling mechanism and the suppression measures were worthy of further discussion and research.