电力系统保护与控制2025，Vol.53Issue(14)：59-68,10.DOI:10.19783/j.cnki.pspc.241336
多换流器系统离散状态空间模型的模态分析法
Modal analysis method for discrete state-space model of multi-converter systems
摘要
Abstract
Modal analysis conducted in the continuous frequency domain can identify the dominant nodes that influence the weakly damped modes in a system.However,as the number of converters increases,the system exhibits high-order dynamic characteristics,posing significant challenges to modal identification and quantitative analysis.To address this,a stability quantitative evaluation method based on a discrete state-space model is proposed.First,referring to the electromagnetic transient simulation modeling principles,an equivalent circuit model in the discrete domain is established.Numerical computation and modeling analysis are then carried out by computers,effectively avoiding the computational burden associated with symbolic variable operations in continuous frequency domain analysis.Second,the system modes are solved from the discrete-time model derived from the equivalent circuit.Node participation factor analysis is performed according to the frequency domain model of the discrete node admittance to identify the weak points of the system.Finally,combined with the chain rule,the sensitivity of system modes to converter parameters is quantified,enabling targeted parameter optimization to improve system performance.The study demonstrates that this analysis framework provides an efficient and reliable approach for stability evaluation of complex systems.关键词
模态灵敏度/节点导纳矩阵/离散域/小信号稳定/多换流器系统Key words
modal sensitivity/nodal admittance matrix/discrete domain/small-signal stability/multi-converter system引用本文复制引用
费思媛,高晨祥,汪可友,徐晋,秦世耀..多换流器系统离散状态空间模型的模态分析法[J].电力系统保护与控制,2025,53(14):59-68,10.基金项目
This work is supported by the National Key Research and Development Program of China(No.2022YFB2402800). 国家重点研发计划项目资助(2022YFB2402800) （No.2022YFB2402800）
