高压直流输电系统混合直流滤波器性能研究

A Study of Hybrid DC Filter for HVDC System

由于技术经济的原因 ,在高压直流输电系统中采用有源滤波器和无源滤波器构成的混合直流滤波器是未来的发展方向。首先探讨了混合直流滤波器的一种实用原理接线 ,即有源电力滤波器串接在原先并联的无源滤波器下方的方式 ,并在此基础上分析它的谐波等效电路 ,以幅频特性为指标分析其稳态滤波特性 ,对控制方法提出了改进 ,最后对该混合直流滤波器的稳定性作了理论分析。结果表明 ,有源滤波器的装设有效地改进了滤波效果 ,而且也提高了系统的稳定性。

Because of economic and technical reasons,hybrid DC filter,which is composed of active filter and passive filter,will widely adopted in HVDC system.Based on the discussion of a practical connection way of hybrid DC filter its equivalent harmonic circuit is analyzed,in which an active filter is connected in series with a parallel passive filter.Its steady characteristic is also analyzed with the amplitude frequency characteristic as its index.The improvement of control method is proposed.Its stability is theoretically studied.The result shows that the filter performance and system stability are improved by the use of an active power filter.