基于直流电压跌落因子的换相失败判断方法  

Assessment Method for Evaluating Commutation Failure Based on DC Voltage

作　　者：张潮 ZHANG Chao(State Grid Taizhou Power Supply Company,Taizhou,Jiangsu 225300,China)

机构地区：[1]国网泰州供电公司,江苏泰州225300

出　　处：《东北电力技术》2020年第8期20-25,共6页Northeast Electric Power Technology

摘　　要：目前直流换相失败主要靠暂态时域仿真判断,计算量大,效率较低,难以满足复杂的交直流电力系统规划要求。将节点阻抗矩阵扩展至有源节点内部,提出了扩展阻抗矩阵的概念,并在此基础上提出了直流电压跌落因子,结合电压型及熄弧角型换相失败判断标准可以快速判断交流故障后直流是否发生换相失败,仿真分析验证了该方法的有效性,可以用于系统规划运行领域。At present,the problem of whether commutation failures of DC transmission system happen mainly depends on transient time domain simulation.But the efficiency of the method is low because of the large calculation load and it can't meet the requirements of complex AC/DC power system planning.The node impedance matrix is extended into the active node and the concept of extended impedance matrix is proposed.On this basis,DC voltage drop factor(DCVDF)can be defined.By combination of DCVDF and minimum voltage criteria and minimum extinction angle criteria,whether commutation failures happen after AC failures can be quickly determined.The simulation results proveds the accuracy and validity of the proposed method and it can be used for power system planning.

关 键 词：交直流系统 交直流电压耦合因子 扩展阻抗矩阵 直流电压跌落因子 换相失败 

分 类 号：TM721[电气工程—电力系统及自动化]