Network impedance reconstruction method for high-frequency resonance mitigation in cabled distribution systems

Abstract

The increasing proportion of cables and power electronic equipment leads to frequent high-frequency resonance in distribution systems. To address this issue, this paper proposes a network impedance reconstruction method for high-frequency resonance mitigation. The main contributions and improvements of this study include: (i) introducing a passive damping scheme from the network side to achieve resonance mitigation by reconstructing the utility impedance characteristics and disrupting the network parameter conditions, (ii) establishing multiple assessment criteria of the network side, such as the harmonic current amplification factor, Bode plot of the system function, and root locus, to comprehensively evaluate the efficacy of resonance mitigation, and (iii) presenting several technical and economic indexes for the multi-objective optimization of passive damping parameters to promote the resonance mitigation effect. Moreover, the performance of the proposed method is verified by a field case study of an industrial park distribution system. The results demonstrate that the proposed method enables the resonance frequency shift and resonance peak reduction, thereby effectively mitigating high-frequency resonance.