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Multi-harmonic sources identification method for distribution network based on mutual information

SHU Chao-Jun;WANG Ya;CUI Hao;LUO Chun-lin;College of Electrical Engineering and Information Technology,Sichuan University;  
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 mutual 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 order 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.
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