摘要
准确获取输电线路故障点的关键暂态信息,对线路故障原因辨识及线路改造方案的制定都有重要意义。在分析不同类型短路故障行波的基础上,对输电线路不对称短路故障关键暂态信息的获取方法进行了研究。首先利用反演理论,推算出所需的故障点暂态电流波形。结合短路故障类型,构建了基于故障点模量电流幅值、故障角及故障电阻的数学模型并采用改进萤火虫算法(improved firefly algorithm,IFFA)进行求解。仿真结果表明,该方法可准确重现故障点的故障行波,实现关键暂态故障数据的挖掘,有望为输电线路不对称接地故障的故障原因辨识及线路改造提供帮助。
Obtaining key transient information at fault points accurately is of practical significance in failure-cause identification and rebuilding plan formulation for transmission line. By analyzing current traVeling wave for different earth faults, the paper proposed an method for excavating key transient information during unsymmetrical earth fault. With inversion theory, required transient current traveling wave at fault points could be obtained. Combining with fault type, a mathematical model of current amplitude, fault angle and fault resistance was constructed. Furthermore, improved firefly algorithm was adopted to solve model parameter. Simulation results demonstrated that the proposed method could contribute to reproduce traveling wave at the fault points and excavate the key transient fault information accurately, providing help for identification of failure cause and reconstruction of transmission line
出处
《电网技术》
EI
CSCD
北大核心
2017年第8期2702-2708,共7页
Power System Technology
基金
国家自然科学基金项目(51307109)~~
