新型相模变换矩阵在行波保护中的应用

Application of a New Model Transformation Matrix in the Traveling Wave Protection

分析了电网电压等级的提高对继电保护和断路器动作速度提出的更高要求,指出电力系统为了适应变化趋势,继电保护的运算将会以相模变换代替对称分量变换;研究了基于小波分析的超高压输电线路行波保护,将新型相模变换矩阵对故障行波电流电压信号进行解耦,并和常用的相模变换矩阵仿真结果进行比较。实例分析表明:该算法在行波保护中具有很高的应用价值,能够反映所有故障类型;相模变换矩阵在电力系统继电保护中将具有广泛的应用前景。

This paper explores higher requirements for relay protection and circuit breakers＇ operating speed as raised with increase of the voltage rating in power grids, and for the power system to adapt itself to the changing trend, the paper points out that relay protection operation should be performed in time domain, and instead of symmetrical component transformation, phase mode transformation will be the development trend. The paper studies the travel wave protection of the UHV transmission line based on the wavelet decomposition, decoupling the fault traveling current and voltage signal by new modal transformation matrix, and then comparing the results with the simulation results used in the common model transformation matrix. The example analysis shows that the algorithm is highly valuable in the application in the traveling wave protection and the phase mode transformation matrix that can reflect all types of faults in power system protection will has a broad prospect of application.