电力谐波检测迭代变权最小二乘快速基波提取方法

Rapidly Fundamental Wave Detection of Electric Power Harmonic Detection Based on Iteration Variable Weight Least Square Algorithm

电力有源滤波器是电力谐波治理的主要设备。提出一种迭代变权最小二乘支持向量机检测的电力电流基波检测算法,结合结构风险最小和均方最小求解基波系数,可以避免不必要的谐波检测,检测参数降低至2个,加快了检测速度。该方法具有检测精度高、计算量小、抗干扰能力强的特点。根据基波半周期对称性,构造检测信号,将检测时滞缩短至半基波周期。通过仿真检验该算法的检测精度,其相对误差在±0.02%内,分析了基波信号突变及谐波信息突变对检测的影响。仿真结果表明了该方法在较大干扰下基波检测的有效性。

Electric power active power filter is the main equipment used in electric power harmonic control. An Iteration Variable Weight Least Square Algorithm was proposed to rapidly detect fundamental wave of electric power current, which are much advantage such as minimum structure risk and minimum mean square, avoiding to detect unnecessary harmonic, reducing required detection parameters to 2, accelerating detection speed etc.. The algorithm is of high precision, small calculation, and strong anti-interference. Moreover, the testing signal was constructed by the half cycle symmetry of fundamental wave, to short detective delay to a half period. The accuracy of the algorithm was investigated through simulation and the relative errors of all parameters are within ±0.02%. The impact was analyzed on fundamental wave detection when the fundamental wave and/or harmonic signals was mutated. The Simulation results show that the method is availability of detecting for the fundamental wave in the larger interference.