基于广义积分器的谐波电流检测方法研究

针对四桥臂有源电力滤波器的谐波检测环节,提出了一种基于广义积分器的谐波电流检测方法,分析了该检测方法的检测原理及参数k的变化对谐波电流检测效果的影响。仿真结果表明,当电网频率稳定时,该检测方法可准确地提取谐波电流中的基波分量;参数k影响检测的快速性和精确性,应合理设置;该检测方法结构简单,易于实现,对于电网电压畸变、电网频率波动及三相负载不平衡的情况有一定的适应性。

Research of harmonic current detection method based on generalized integrator

In view of harmonic detection link of four-leg active power filter,the paper proposed a harmonic current detection method based on generalized integrator,and analyzed detection principle of the detection method and influence on detection effect of harmonic current by change of parameter k.The simulation result shows that the detection method can extract fundamental component of harmonic current when frequency of power network is stable;the parameter k influences on rapidity and accuracy of detection,so it should be set reasonably;the detection method has certain adaptability to distortion of power voltage,fluctuation of power frequency and unbalance of three-phase load with simple structure and being easy to realize.