改进的单相谐波和无功电流检测算法

基于瞬时无功功率理论的谐波和无功电流检测方法是目前有源滤波装置中广泛采用的检测方法。在分析基于瞬时无功功率理论的单相谐波和无功电流检测算法后,考虑到电网谐波的特点,提出一种改进的方法,在不增加滤波器阶数的前提下,通过增加一个延时,以去除3次和3次倍数谐波的影响,同时提高低通滤波器的截止频率,使总的动态响应时间比改进前缩短了1/3个周期。给出了各种典型复杂谐波状况下的仿真验证。

Improved Method of Detecting Harmonic Currents in Single-phase Circuit

The detection method based on the instantaneous reactive power theory is popularly applied in active power filter(APF) device.An improved harmonic detection algorithm in single-phase circuit based on the instantaneous reactive is proposed,in which a time-delay circuit is used to reducing the delay-time of the lower-pass filter.The influence of the 3k harmonic would be clear by the time-delay circuit,so the total delay-time of the improver method is more less.Theoretical analysis and simulation prove that th...