多直流馈入电网连锁故障风险量化评估分析综述 An Analysis and Summary of Quantitative Risk Assessment about Cascading Failures of Multi-Infeed Direct Current Power System

多直流馈入电网在解决电能的长距离传输和负荷中心的电力短缺问题的同时，也可能导致所接入的交直流系统出现连锁故障问题。首先，本文从连锁换相失败、直流闭锁、交直流系统故障后的暂态稳定问题、换相失败后直流功率的恢复四个故障阶段出发，简要分析了各个阶段的故障原因和影响因素。然后，针对连锁换相失败与系统暂态失稳两方面，分析并总结了相应评估指标和量化评估方法。最后，结合目前多直流馈入电网的最新发展要求，分析不同方法的优劣性，并对连锁故障风险量化评估的研究方向做出展望。 Multi-infeed DC power system plays an important role in dealing with the long-distance power transmission and the power shortage in load center. But it also may lead to the cascading failures of the relevant AC/DC systems. Firstly, this paper briefly analyzes fault causes and influence of successive eras on the basis of chain of commutation failure, DC block, transient stability after the system fault of AC/DC and recovery of DC power after commutation failure. Then, in aspect of chain of commutation failure and transient instability, the corresponding evaluation indexes and quantitative evaluation methods are analyzed and summarized. At last, combined with the latest development requirements, this paper analyzes advantages and disadvantages of different methods and makes expectation about research direction of the quantitative evaluation.