基于FBD理论的有源滤波器参考电流的自适应检测方法

Adaptive Detection Method for Active Power Filter Reference Current Based on FBD Theory

根据FBD功率理论,非有功电流可以作为有源滤波器的参考电流由其进行彻底补偿。在αβ坐标系下,三相三线系统的电压、电流都可以由一条三维曲线表示。将该电流曲线看作一个实时信号,将其中与电压曲线相关的部分滤除,就达到了非有功电流检测的目的。因此,文中提出一种基于干扰对消原理的有源滤波器参考电流的单神经元自适应检测方法,并将该方法推广到三相四线制系统。该检测方法中仅含有一个自适应滤波器,具有结构简单,计算量小等特点。该方法对系统电压对称性没有要求,能够实现非有功电流的综合检测。

According to FBD theory,non-active power current can be looked as reference value of Active Power Filter(APF) and eliminated by APF effectively.The voltages and currents in three-phase system can be described by a three- dimension curve underαβreference frame.The current curve can be thought as a real-time signal and after filtering the component correlated with voltage curve the non-active power current is achieved.Based on former analysis,a novel adaptive detection method based on single nerve cell for reference current of APF is proposed in this paper.This method is also extended to three-phase four-wire system.The proposed method has only one adaptive filter and has many advantages such as simple structure,more less computation,no demand for symmetry of three-phase line voltage,and so on.