一种快速评估多馈入直流系统换相失败风险的方法  

A Fast Assessment Method for Evaluating Commutation Failure Risk of Multi-infeed HVDC Systems

作　　者：邵瑶[1] 汤涌[1] 

机构地区：[1]电网安全与节能国家重点实验室(中国电力科学研究院),北京市海淀区100192

出　　处：《中国电机工程学报》2017年第12期3429-3436,共8页Proceedings of the CSEE

基　　金：国家电网公司科技项目(XT71-16-047)~~

摘　　要：快速并准确地评估受端系统交流故障导致多馈入直流系统换相失败的风险,对于保障大电网的安全稳定运行具有重要意义。在多馈入交互作用因子(multi-infeed interaction factor,MIIF)定义的启发下,提出了交直流系统电压耦合作用因子(AC-DC voltage coupling factor,ADVCF)的概念,并基于节点阻抗矩阵推导出ADVCF的简便计算公式。通过最小熄弧角判断标准推导出临界交直流系统电压耦合作用因子(critical ac-dc voltage coupling factor,CADVCF)指标的通用表达式,基于CADVCF提出了一种快速评估多馈入直流系统换相失败风险的方法:受端系统某交流母线发生三相短路故障时,如果某回直流与该交流母线间的ADVCF大于CADVCF,则该回直流会发生换相失败。实际大电网的分析结果证明了所提评估方法的快速性和准确性。Quickly and accurately assessing the risk of commutation failure in multi-infeed （high voltage direct current,HVDC）systems when faults occurring at the receiving- end AC system, have great significance to ensure the safe and stable operation of large power grids. Inspired by the definition of multi-infeed interaction factor （MIIF）, the concept of AC- DC voltage coupling factor （ADVCF） was proposed. Based on the node impedance matrix, a simple calculation formula of ADVCF was derived. The calculation formula of the critical AC-DC voltage coupling factor （CADVCF） was derived by the minimum extinction angle criteria. A method based on CADVCF to fast evaluate commutation failure risk of multi- infeed HVDC system was proposed： when a three-phase short- circuit fault is occurring at an receiving-end system AC bus, if the ADVCF between one DC system and the AC bus is larger than the CADVCF between them, commutation failure will occur in the DC system. The simulation results of the actual large-scale system prove the speediness and accuracy of the proposed assessment method.

关 键 词：多馈入直流输电系统 换相失败 多馈入交互作用因子 交直流系统电压耦合作用因子 临界交直流系统电压耦合作用因子 

分 类 号：TM71[电气工程—电力系统及自动化]