注入式混合型有源电力滤波器谐波检测方法研究

Research of the Harmonic Detection Method of the Hybrid Active Power Filter Based on Injection Circuit

首先分析了注入式混合型有源电力滤波器的结构及工作原理,针对有源电力滤波器的工作性能很大程度上取决于对谐波电流高精度、实时的检测,提出一种基于瞬时无功功率理论ip-iq谐波检测算法的改进算法,采用最小均方(LMS)自适应滤波器作为检测电路中的低通滤波器。可以更快地检测出谐波电流的指令信号,具有更好的稳态检测精度。利用MATLAB对其进行建模和仿真,验证了谐波电流检测算法的正确性和有效性。

This paper analyses the structure and working principle of the hybrid active power filter based on injection circuit at first. According to the worl~ performance of the hybrid active power filter largely depends on high precision and real-time detection of the harmonic current, An improved harmonic detection algorithm based on the instantaneous reactive power theory is proposed, in which the least mean square{LMS } adaptive filter is used as the low-pass filter in the detection circuit. This algorithm can detect the instruction signals of the harmonic current much faster than the traditional algorithm, has better steady-state detection accuracy. The simulation results show that the harmonic current detection algorithm and current control algorithm is correct and effective.