To mitigate the impact of singular values in voltage and current signals on regression results and achieve a more accurate delineation of harmonic responsibilities for both the system and users,this paper proposes a method for calculating system harmonic impedance based on partial least squares(PLS)equivalent weight regression.Utiliz-ing harmonic voltage and current data from common connection points,the paper formulates a regression equation containing the sought-after parameters.The PLS is then employed to determine regression coefficients,which corre-spond to the harmonic impedance and harmonic voltage on the system side.These coefficients are used as initial val-ues for iterative equivalent weight calculations.Then,the user's harmonic emission level is deduced based on the it-erative results.This approach overcomes the drawbacks of using the least squares solution as an initial value for it-erative calculations,enhancing the precision of user's harmonic emission level calculations.The accuracy of the proposed method is validated through simulation analysis in case studies.
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