基于瞬时值比较的电流型有源滤波器谐振抑制方法

Resonance Suppression Method of Current Source Active Power Filter Based on Instantaneous Comparison Control

有源电力滤波器是一种应对电网谐波污染的有效手段。本文提出了一种基于瞬时值比较的电流型有源电力滤波器控制方法。在此基础上,针对有源滤波器的控制方式引起电流谐振的现象,提出了基于电网谐波电压和谐波电流的有源阻尼方法。当有源电力滤波器采用检测负载电流的工作方式时,如果负载电流包括容性电流,则该系统可能存在谐振危险,影响系统的稳定和谐波补偿效果。本文通过检测电网电压、网侧及负载侧的电流,采用网侧电压谐波和电流谐波双重阻尼反馈控制,保证有源滤波装置可以避免发生谐振,获得最理想的谐波补偿效果。仿真和实验结果证明了所提出的电流型有源电力滤波器控制方法的有效性。

Active power filter is an effective means to deal with the harmonic pollution in the power grid. This paper presents a current control method based on instantaneous comparison for active power filter. On this basis, according to the current resonance phenomenon caused by the active filter control, this paper presents a control method based on the harmonic voltage and harmonic current active damping. When active power filter works by detecting the load current, if the load current includes a capacitive current, then the system may present risk of resonance effect, which affect the system stability and harmonic compensation. Through detecting of the supply voltage, supply current and load side current, this paper adopts double feedback damping control based on the voltage harmonic and current harmonic to avoid the occurrence of resonance system and ensure the optimal harmonic compensation effect. The simulation and experimental results prove that the proposed current control method for active power filter is effective.