电力系统谐振抑制可行域评价与有源阻尼器重塑阻抗设计OA

With the increasing prevalence of power electronic devices in power systems,the characteristics of system resonance are becoming more diverse.Existing resonance suppression strategies are usually designed for specific scenarios closely related to the impedance frequency-magnitude characteristics.It is challenging to unify the effectiveness of resonance suppression in various resonance scenarios,and there is a lack of evaluation methods for the effectiveness of suppression strategies in various scenarios.In this paper,based on the changes in node impedance before and after resonance suppression,the feasible region of local/remote resonance suppression is proposed to achieve a unified evaluation of the effects of resonance suppression strategies in the system on changing the amplitude of resonance impedance.The equivalent impedance of the resonance suppression link is decoupled from the system impedance,avoiding the complex matrix inversion required for each resonance suppression strategy in the system impedance calculation,thus simplifying the evaluation process.Meanwhile,the relative feasible region and the ideal feasible region are defined to provide guidance for selecting more appropriate resonance suppression strategies and parameters.On this basis,this paper proposes an impedance reshaping design method for the active damper based on the ideal feasible region of resonance suppression.This method involves parameter design of impedance reshaping in various resonance scenarios,thereby achieving global resonance suppression for multiple nodes in the system.Finally,simulation models and hardware-in-the-loop simulation platforms are constructed to verify the effectiveness of the proposed evaluation method and impedance reshaping.