基于灰色预测理论的并联型混合电力有源滤波器研究

Study of hybrid filter connected in series APF with PF based on grey prediction control

并联型混合有源滤波器应用于电力系统可以动态抑制电网谐波,但由于有源滤波器控制延时影响而无法进行完全电流补偿。提出采用灰色模型来实现无时延预测控制,并将其应用于并联型混合有源滤波器有效补偿非线性负载中的谐波电流。文中具体分析了并联型混合电力有源滤波器的谐波检测原理、灰色预测控制策略及PWM滞环比较控制策略,在EMTDC平台建立基于灰色预测控制策略的并联型混合有源滤波器仿真模型进行测试,仿真结果表明采用灰色预测控制策略的并联型混合有源滤波器有较好的谐波抑制和无功补偿的性能。

Hybrid parallel active filter is considered as an effective method for the dynamic suppression of power system harmonic. However, the hybrid active filter system is sensitivity to the delay control and difficult to compensate completely the harmonic current of nonlinear load. In this paper, a hybrid active filter with grey prediction controller is proposed for the harmonic compensation. The grey prediction control strategies as well as the harmonic detection are analyzed, and current hysteresis comparison control method is developed. A simulation model of hybrid active filter based on EMTDC is presented. The simulation results show that the PHAPF with grey prediction controller gives a satisfactory performance in harmonic and reactive power compensation.