直流滤波器电容器塔的在线监测方案初步探讨

近年电力系统迅速扩大,同时随着高压直流输电技术上取得的突破和交流输电缺陷的进一步凸显,为高压直流输电的广泛应用铺平了道路。直流滤波器电容器塔作为直流输电系统的重要组成部分发挥着重要作用,他可以滤除直流侧的谐波,减少不利影响。在电容器塔的实际运行过程中常发生保护误动的情况,而停电检测又检测不到问题,如此往复影响输电线路的正常运行。基于上述问题,本文提出了对电容器塔进行在线监测的方案,通过监测电容器的端电压和流过的电流,计算电容器的电容值,实时监测电容器的运行状态。根据电容器的运行状态可以提前分析电容器的运行走势,及时开展预防工作,避免不必要的损失。

Preliminary Discussion of On-line Monitoring Scheme for DC Filter Capacitor Tower

Rapid expansion of electrical power system in recent years and,at the same time,the break-through of HVDC transmission technology and further defect prominent of AC power transmission has paved the way for the wide application of HVDC transmission system. As an important part of HVDC sys-tem,DC filter capacitor tower plays an important role,not only in filtering the harmonic in DC side, but also in reducing the adverse effects. The malfunction of the protection is often occurred in the actual operation of the capacitor tower and the problem cannot be detected with power off and the normal operation of the transmission line is affected by the repeating effect. Based on the above issues,the on-line monitoring scheme for capacitor tower is proposed in this paper to calculate capacitance of capacitor and real-time monitor the operation status of capacitor by way of monitoring end voltage and the flow current of capacitor. The operation trend of the capacitor can be analyzed in advance in accordance with the operation status of the capacitor,develop preventive work timely and avoid unnecessary loss.