串补线路模型法的改进

在超高压输电线路上装设串联补偿电容,给电网运行带来了很多优点,但却给继电保护装置的整定计算带来了一些问题。用传统方法计算线性方程组,所得结果误差较大,使得算法难以发挥应有的作用。文章从理论上讨论了串补线路模型法在故障暂态过程中几种可能的降阶方法,包括线路模型代入法、误差判别法、谐波判别法、串联电容判别法和实用降阶法,并对这些方法逐一进行误差分析。分析表明采用实用降阶法,具有计算量小,精度高,且不受电容器间隙保护动作情况影响的优点。

An improved module algorithm in series-compensated transmission lines

The series-compensated lines are good for net running in ultra-voltage lines.But it has some limitation for relay setting coordination.The traditional method means large error for calculating linear equation groups, so its application is limited. This paper discusses a few ways to solve the problem. The ways includes module inserting, error distinguishing, wave distinguishing, series compensated and practical de-ladder means. The actual fault analysis show that the practical de-ladder means is good ,the calculation work is minite, the accurate is higher, and cannot be disturbed by compensated gap relay.