基于临界阻抗边界的多馈直流系统同时故障风险评价.pdfVIP

第 37 卷 第 3 期 电 网 技 术 Vol. 37 No. 3 2013 年 3 月 Power System Technology Mar. 2013 文章编号：1000-3673 （2013 ）03-0874-05 中图分类号：TM 721 文献标志码：A 学科代码：470·4051 基于临界阻抗边界的多馈直流系统 同时故障风险评估 陈政，周保荣，洪潮，金小明 （南方电网科学研究院，广东省广州市 510080 ） Critical Impedance Boundary-Based Risk Assessment on Simultaneous Faults in Multi-Infeed DC Transmission System CHEN Zheng, ZHOU Baorong, HONG Chao, JIN Xiaoming (CSG Electric Power Research Institute, Guangzhou 510080, Guangdong Province, China) ABSTRACT: At present the risk assessment on simultaneous 关键词：多馈直流；节点阻抗；换相失败；同时故障；风险 faults occurred in multi-infeed DC transmission system is 评估 mainly performed by use of time-domain transient simulation 0 引言 tolls. In view of heavy computational burden and long computation time, it is difficult to meet flexible and changeable 在多馈直流输电系统中，当受端交流系统发生 application requirements of power system planning and 故障时，将可能导致多回直流同时发生换相失败， operation. Leading in the definition of nodal voltage 甚至出现多回直流输送功率中断，严重危及电网运 influencing factor (VIF), the expression of nodal impedance 行安全。准确评估多馈直流输电系统同时发生换 matrix for bus voltage drop ratio of converter substation is 相失败、功率中断等故障风险是电网规划运行的 derived, and taking critical voltage drop threshold as criterion, the boundaries of critical fault impedances of converter stations 重要问题。目前多馈直流输电系统同时故障风险 are determined and according to overlap of critical fault 评估主要依赖时域暂态仿真扫描计算来确定，该 impedance boundaries of converter stations the risk assessment 方法计算量大，耗时长，难以满足系统规划运行 of simultaneous f