注入式混合型有源滤波器研究

提供了一种大容量、低成本的注入式混合型有源滤波器以适用于高压系统同时进行谐波抑制和无功补偿,其中,利用大容量无源滤波器实现谐波抑制和无功补偿;采用有源滤波器改善系统滤波效果并阻尼无源滤波器与系统阻抗之间的串、并联谐振。讨论了采用检测电网电流的控制策略时,注入式混合型有源滤波器的工作原理,其基本思想是通过对有源部分进行适当控制来等效增大电网支路的谐波阻抗。从抑制电网阻抗与无源滤波器之间的串、并联谐振,改善无源滤波器的滤波效果以及提高整个系统的鲁棒性3个方面详尽分析了注入式混合型有源滤波器的稳态补偿特性。相关仿真结果及工程应用效果均证明了该混合型有源滤波器对于同时进行谐波抑制和无功补偿的可行性。

Study of injection-type hybrid active power filter

A high-capacity,low-cost ITHAPF(Injection Type Hybrid Active Power Filter) suitable for both harmonic suppression and reactive power compensation in high-voltage power system is proposed,which applies high-capacity PFs(Passive Filters) for harmonic suppression and reactive power compensation and APF(Active Power Filter) for filter performance enhancement and PF-system re-sonance damping.Its functional principles are discussed in detail,which applies the control strategy of grid current detection and controls APF to equivalently enhance the harmonic impedance of grid branch.Its steady-state compensation characteristics are analyzed in PF-system resonance damping,filter performance enhancement and system robustness improvement.Simulation and applications have verified its effectiveness in both harmonic suppression and reactive power compensation.