基于小波模极大值理论的HVDC输电线路行波故障定位方法的研究

Research of HVDC transmission line traveling-wave fault location method based on wavelet modulus maxima theory

根据行波定位的特点,介绍了一种基于小波模极大值理论的双端行波故障定位的方法,以及这种方法在HVDC输电线路行波故障定位中的应用和实现方案。用PSCAD(Power Systems Computer Aided Design)和Matlab软件进行了单极HVDC系统仿真分析,得到了发生故障后初始电流行波波头到达两侧的精确时间,进而得出了故障点到达逆变侧母线的距离。结果表明,用小波变换的方法可准确识别电流行波波头,实现HVDC输电线路高度精确的故障定位。

According to the features of traveling-wave fault location, this paper describes the double terminal traveling-wave fault location method which based on the wavelet modulus maxima theory and application and realization of HVDC transmission line traveling-wave fault location. A single-pole HVDC system is simulated by using the PSCAD and MATLAB software, so the distance between inverter＇s bus and fault location is obtained. The result indicates that by using the wavelet theory, the wavefront of the current traveling-wave can be accurately distinguished, thereby the accurate fault location can be realized.