一种基于改进型ip-iq方法的有源滤波器

在瞬时无功功率理论的基础上,提出一种基于改进型ip-iq谐波电流检测方法的有源滤波器。改进型检测方法用简单的积分、延时加增益环节来代替传统ip-iq方法中的低通滤波器,将检测延时减少到1/6个电源周期。同时这种检测方法还可以推广到单相、三相4线电路和三相不平衡负载的场合中。电流跟踪控制采用滞环比较方式,实际补偿电流能够实时精确跟踪谐波指令电流。采用能量平衡原理实现了逆变器直流侧电压的控制。仿真结果表明,这种有源滤波器能够实时、有效地补偿系统的谐波和无功电流。

Active Power Filter Based on an Improved ip-iq Method

An active power filter with an improved i_(p)-i_(q) harmonics detecting method is proposed based on instantaneous reactive power theory.This improved method substitutes the low pass filter in conventional i_(p)-i_(q) method by simple integration,delay and gain,which can reduce the detecting delay to 1/6 of source period.Meanwhile,this method can also be applied to a single-phase circuit,three-phase four-wire circuit and three unbalanced loads.Hysteresis comparison is used in current tracking control,so that the compensation current follows the harmonic reference signal fast and precisely.Furthermore,DC voltage control is achieved adopting power balance theory.The simulation results verify that the APF can effectively and timely compensate harmonic and reactive currents.