To solve the problems existing in parameter identification for dielectric response of XLPE power cable, so as to further study the inner link between aging condition of XLPE power cable and dielectric relaxation response, we put forward a method based on the matrix pencil algorithm to identify the equivalent circuit parameters of extended Debye model. Firstly, the Hankel matrix is created by the depolarization current. Then, singular value decomposition for the Hankel matrix is done to discriminate the signal subspace and noise subspace, and the number of equivalent circuit relaxation branches is identified by the singular value. Finally, the equivalent circuit parameters of depolarization current are identified using the number of relaxation branches. The simulation and experimental results show that the method can effectively identify the number of equivalent circuit relaxation branches and parameters of extended Debye model, and the method can reconstruct the depolarization current even with strong noises. The proposed method provides a correct and useful mathematical diagnostic model for evaluating the relaxation response performance of XLPE power cable.
KEY WORDS :XLPE power cable;extended Debye model;depolarization current;parameter identification;matrix pencil;
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