不同电压等级同杆双回线断线故障分析方法  

Disconnection Fault Analysis of Double Circuit Transmission Line at Different Voltage Levels

作　　者：陆政君 范春菊[2] 赵铎 黄宗启 覃雪梅 LU Zhengjun;FAN Chunju;ZHAO Duo;HUANG Zongqi;QIN Xuemei(China Datang Corporation Science&Technology Research Institute,Nanning 530007,Guangxi Zhuang Autonomous Region,China;School of Electronic Information and Electrical Engineering,Shanghai Jiaotong University,Minhang District,Shanghai 200240,China)

机构地区：[1]中国大唐集团科学技术研究院有限公司,广西壮族自治区南宁市530007 [2]上海交通大学电子信息与电气工程学院,上海市闵行区200240

出　　处：《电网技术》2021年第4期1588-1595,共8页Power System Technology

摘　　要：不同电压等级双回线运行方式复杂,线路间存在复杂的耦合,考虑到目前对断线故障还缺少相应的故障分析研究,因此提出一种不同电压等级同杆双回线断线故障分析方法。根据不同电压等级同杆双回线的解耦思路以及系统阻抗修正方法,画出断线故障时六序分量序网图,针对单回线断线的特殊条件提出序网图的简化版。根据I、II回线正序网有源的特点,列出各序分量方程式。根据断线时的边界条件,在电压约束或者电流约束唯一条件下,画出各复合序网图,进而算出序电流和序电压,但该方法计算复杂,因此提出解方程组法直接计算各序电压和各序电流,进而计算出断口电压和相电流。计算结果与PSCAD仿真结果对比,验证了不同电压等级同杆双回线断线故障分析的正确性。The operation mode of the transmission lines at different voltage levels is complex, and coupling between the lines is complex. So considering that there are no corresponding studies on disconnection fault analysis, a disconnection fault analysis method of double circuit transmission line at different voltage levels is presented. Based on the idea of decoupling and system impedance modifying methods, six-sequence networks in disconnection faults are presented, which can be simplified according to the single-line disconnection fault. Based on that positive sequence network of I& II lines power source, the equations of the sequence components are presented. According to the boundary conditions of disconnection faults, on the condition of unique voltage constraint or current constraint, the integrated sequence networks are presented, and the sequence voltage and the sequence current will be calculated, only to find the very complex algorithm. So the method of solving a set of equations is presented to calculate the sequence voltages and the sequence currents directly, hence the disconnection voltage and current. The comparison of this calculation with the PSCAD simulation proves the correctness of the disconnection fault analysis method of double circuit transmission line at different voltage levels.

关 键 词：不同电压等级 同杆双回线 断线故障 复合序网图 故障分析 

分 类 号：TM721[电气工程—电力系统及自动化]