基于瞬时无功理论的谐波电流检测法原理及内在联系探究

Research on Principles and Internal Relations of Harmonic Extraction Based on Instantaneous Reactive Power Theory

从数学角度推导3种检测方法(p-q法、ip-iq法、d-q法)所用变换的本质,在电网电压无畸变时,3种谐波电流检测方法是等同的,都能对非线性负载产生的谐波电流进行有效补偿,只是延迟稍有不同。当电网电压发生畸变时,p-q法在电网电压为非理想电压下检测误差很大,而另2种方法由于检测的是电源正序基波分量的正余弦单位矢量,故理论上电压的畸变对检测不产生影响。

The essential aspect of the transform which is used in the three harmonic extraction methods （p-q, ip-iq, d-q） is brought out from the angle of mathematics. The effect of the three harmonic extraction methods is similar when the electric voltage of charged barbed wire net have no mutation and they can compensate the harmonic which is produced by non-liner load effectively. The two delays have little dissimilarity. When electric voltage is aberrant, the p-q method has a big examination error margin under the no- ideal electric voltage and the mutation of electric voltage doesn＇t influence the examination of the other two methods, for they examine the positive-cosine unit vector of positive preface of the basic wave.