配电网系统背景谐波衰减控制研究

RESEARCH OF NOVEL BACKGROUND HARMONIC MITIGATING STRATEGY IN DISTRIBUTION POWER SYSTEM

在射线型配电网末端安装动态调节增益的有源滤波器只能抑制谐波的放大现象,不能实现对谐波的有效衰减,且可能引起电压谐振。基于以上问题,提出分频动态增益调节的有源滤波器(discrete frequency automaticgain tuning active filter,DFAGTAF)最优安装位置的谐波衰减方案,得出在距谐波源最近的各次谐波的谐振峰值处为DFAGTAF的最优安装位置。该方案不仅可对有源滤波器安装点谐波进行有效衰减,同时对线路其他位置也能实现良好的谐波衰减效果,且对配电线参数的改变以及非线性负载的切入具有较强的鲁棒性。仿真和实验结果均验证了该方案的正确性和有效性。

With the use of abundant power electronic devices, the resonance phenomenon in power system becomes one of attention focuses. The Automatic Gain Tuning of active filter installed at the end of the radial distribution network can only suppress the harmonic amplification phenomenon, but cannot mitigate the harmonics effectively, and may cause voltage resonance. Based on the above problems, discrete frequency automatic gain tuning active filter （DFAGTAF） of the optimal installation position about harmonic suppression program was put forward, namely the position of the resonance peak of every harmonic waves being the closest to the harmonics source for DFAGTAF of the optimal installation position. The program can not only realize effectively the harmonic amplification phenomenon mitigation in active filter installation point, but also can achieve great harmonic mitigation effect in all of other positions on line, and the change of the parameters of the distribution line and nonlinear load cuts have stronger robustness. The simulation and experimental results verify the correctness and effectiveness of the program.