基于互信息的配电网多谐波源识别方法

摘要

针对配电网非线性负荷谐波污染责任划分,及多谐波源位置判定方法中存在的问题,提出一种基于互信息的多谐波源识别方法.首先,测量PCC点谐波电压,通过独立分量分析估计出谐波电流的大小;然后,利用Copula熵法估计谐波电流和谐波电压之间的互信息,依据互信息的值识别出多谐波源;最后,在 IEEE 14节点系统上进行仿真测试,测试结果表明:在网络参数未知的情况下,该文所提方法能准确定位多个谐波源,可以作为区分实际谐波污染责任的新判据.%According to the existing problems of dividing the nonlinear load harmonic pollution liability and locating the multi-harmonic sources method,a multi-harmonic sources identification method based on mutual information(MI) was proposed in this paper.First,the harmonic voltage at point of common coupling(PCC)point was measured,and the magnitude of the harmonic current was estimated by independent component analysis(ICA).And then,the mu-tual information between the harmonic current and the harmonic voltage of the busbar was calculated by using the Copula entropy.On the basis of mutual information value,the multi-harmonic sources was identified.Finally,in or-der to verify the validity of the proposed method,simulation test on IEEE14 bus system was carried out.The results show that under unknown network parameters,the method can accurately locate the multi-harmonic sources,which can be used as a new criterion to distinguish the actual harmonic pollution liability.