采用FBD电流检测法的三相四线APF

Three-phase four-wire APF based on FBD-method current detection

为使有源电力滤波器(APF)更加有效地应用于三相四线制系统中,对FBD法基本原理进行了详细的介绍,阐述了基于FBD法的三相四线制并联型APF电流检测算法,通过建立相应的单位参考电压矢量,分别对三相四线制系统中的无功电流、谐波电流、零序电流进行检测。对三相四线制APF的主电路拓扑结构及系统原理进行了研究。分析了直流侧电压取值的原则和直流电容容量的选择依据,给出了功率器件的电压等级和容量确定方法,分析了输出电抗器的参数选择依据,给出了控制系统的基本构成。针对谐波问题严重的工业现场,对装置进行了工程现场应用,工程应用结果证明了该系统的可行性和有效性。

For the more effective application of APF（Active Power Filter） in three-phase four-wire system, the basic theory of FBD method is introduced and the FBD-method-based real-time current detection is presented. The reactive current ,harmonic current and zero-sequent current of three-phase four-wire system are detected by establishing unit reference voltage vectors. The main circuitry and system principle of APF are researched,the selection rules of DC voltage and DC capacitor are analyzed,the ways to determine the voltage and capacity of power components are presented ,the selection principle of output reactor introduced and the structure of control system is given. The application in the industrial field with serious harmonic problem shows its feasibility and validity.