Parameters Identification for Extended Debye Model of XLPE Cables Based on Sparsity-Promoting Dynamic Mode Decomposition Method

To identify the parameters of extended Debye model XLPE cables, and therefore evaluate insulation performance samples, sparsity-promoting dynamic mode decomposition (SPDMD) method was introduced, as well basics processes its application were explained. The amplitude vector based on polarization current first calculated. Based non-zero elements vector, number branches including coefficients time constants each branch derived. Further research parameter identification cables at different aging stages SPDMD carried out to verify practicability method. Compared with traditional differential method, simulation experiment indicated that can effectively avoid problems such relaxation peak being unobvious, possessing more accuracy during identification. And due less affected by measurement noise than depolarization current, results spectral line proved be better reflecting response characteristics dielectric. In addition, domain test converted into frequency domain, then used obtain dielectric loss factor spectrum insulation. integral a condition cable.