超高压线路串补电容的微机保护算法

在超高压输电线路系统中,串联电容补偿具有提高输送容量和改善系统稳定性等优点,但由于串补电容的存在导致输电线路继电保护存在一系列问题。根据串补电容对距离保护和零序方向保护影响的理论分析,提出了基于TCSC串补电容的线路微机保护算法。算法利用TCSC的运行参数,考虑了串补电容在暂态过程以及电容运行状态对保护参数整定的影响,以避免TCSC使保护拒动或误动。最后通过仿真运行表明,该算法对于带有不同运行状态的TCSC的输电线路有很强的适应力和可靠性,可以满足线路继电保护的基本要求。

Microprocessor-based protection algorithm in UHV transmission lines with series compensated capacitor

In ultra high voltage transmission system, series compensated capacitor has many advantages such as enhancing the transmission capacity and improving the stability of power system. But series compensated capacitor also generates many problems in protective relaying of transmission lines. In this paper, according to the theoretical analysis of the distance protection and zero-sequence direction protection affected by series capacitor, it is presented that a microprocessor-based protection algorithm based on TCSC capacitor. The algorithm uses the operation parameters of TCSC, which considers the effect of the transient process of series compensated capacitor and the state of capacitor operation to protection parameters setting. So it can avoid protective relaying rejection or malfunction. At last the results of computer simulation confirm that this algorithm has high adaptability and reliability in different TCSC operation, which can satisfy the basic requirements of protective relaying.