基于积分方程的互感线路参数带电测量研究

Study of live line measurement of parameters of transmission lines with mutual inductance based on integral equations

首先简要回顾了通常得到输电线路参数的三种方法,然后在增量法的基础上提出了基于GPS和积分方程的互感线路参数带电测量的新方法——积分法。该方法是将互感线路的伏安特性方程转化为积分形式, 并采用了最小二乘法求解方程组,同时得出各线路的零序自阻抗及线路间的零序互阻抗。文中给出了详细的数学模型和数字仿真结果以及软件算法流程图,介绍了模拟实验过程,并将积分法与增量法的计算结果进行时比,结果表明积分法的测量结果是精确可信的。与增量法相比,该方法具有一定的滤波作用,一定程度上可以抑制高频分量,进行测量时一般不需额外提供测量用电源,方式更为省时省力。

The conventional methods of measuring transmission lines parameters were briefly reviewed and a new integral equation method of live line measurement of transmission lines＇ mutual inductance parameters was proposed, The new method turned the voltampere characteristic equation of transmission lines into an integral form, then used least square method to solve the equations and got the zero-sequence parameters, The principle and corresponding mathematical models of the new method were explained, Moreover, digital simulation results with the new methods were shown and the software algorithms was deduced. Finally, an experiment was introduced and the comparison between the incremental method and the integral equation method was given, Experiment results showed that the new method is accurate and believable, Compared with incremental approach, the new method can suppress the high-frequency parts and this method seldom need an extra power,