基于新相模变换的可控串补线路行波测距方法

A Novel Phase Module Transform-based Travelling Wave Fault Locating Method for TCSC Transmission Lines

含TCSC的输电线路故障测距是较为困难的问题,困难之处在于:TCSC的数学建模较为困难、TCSC安装处存在波阻抗不连续以及MOV启动和保护动作会对行波测距产生影响。此文在理论分析的基础上,提出了一种基于小波理论和新的相模变换的双端行波测距方法。利用搭建的含TCSC输电线路的电磁暂态模型,在经典N和Q值下TCSC动态和稳态工作条件下,针对不同故障位置、不同故障类型、不同过渡电阻和不同故障初相位等各种故障进行仿真,提取了线路两端电流行波的线模分量,并利用小波分析模块分析结果。仿真结果证实了该双端测距方法的有效性,TCSC的存在未影响到该行波测距方法的准确性。

It is rather difficult for TCSC transmission lines to locate the fault occurred. The difficulties are the hardness of establishing the TCSC model, the surge impedance discontinuity of TCSC, the influence of MOV＇s and its protection＇ s operation on fault locating of the travelling wave. On the basis of the theoretical analysis, a wavelet theory and novel phase module transform - based two - terminal fault locating method has been presented in this paper. The electromagnetic transient simulation model established for the TCSC lines is used to obtain the components of the current travelling wave on the two terminals of the lines under both dynamic and static operating conditions of TCSC at typical λ and Q values by simulating different faults according to different fault locations and types, different transient resistances and different fault initial phases. Then the results are analyzed by using the wavelet module. The simulation results have confirmed the effectiveness of the two- terminal fault locating method and proved that the structural characteristic of TCSC has no influence on the accuracy of the presented fault locating method.