有源滤波器中谐波电流自适应预测方法研究

Research on the Adaptive Predictive Algorithm for Harmonic Current in the Active Power Filter

准确、实时地检测出电网电流中的谐波成分是保证有源电力滤波器具备良好工作性能的关键。本文提出一种改进型的基于自适应滤波器的谐波电流预测方法,利用最小均方算法(LMS)对所需检测信号进行预测,通过该方法和基于瞬时无功功率理论方法相结合,可以解决谐波检测中存在的检测精度和检测实时性之间的矛盾。仿真结果证明了该谐波检测方法的有效性。

It is important for the performance of APF(Active Power Filter) that harmonic current in power system is detected accurately and real timely. A modified harmonic current detecting algorithm based on adaptive predictive filter is present in this paper.The least mean square algorithm is used to predict the signals to be detected. The conflict between the detecting accuracy and the real time in harmonic current detection can be solved through combine this algorithm with the method based on instantaneous reactive power theory. The simulation results show its validity.