电网技术2026，Vol.50Issue(3)：中插96,1223-1233,中插97-中插98,14.DOI:10.13335/j.1000-3673.pst.2025.1329
基于灵敏度与参数耦合量化分析的柔性互联系统小信号稳定性研究
Small-signal Stability Research of Flexible Interconnected Systems Based on Sensitivity and Parameter Coupling Quantification Analysis
摘要
Abstract
Along with the increasing penetration of power electronics in distribution networks,small-signal stability issues,such as wide-band oscillations,have become increasingly severe.This paper focuses on a power-converter-based flexible interconnection system for distribution networks and investigates its small-signal stability.Firstly,based on the established small-signal impedance model of the DC side,Million's Theorem is used to obtain the parallel equivalent circuit.Subsequently,the Nyquist criterion is applied to assess stability and determine the corresponding stability boundary.Subsequently,based on a sensitivity analysis of the DC-side impedance transfer function,a quantitative sensitivity index is constructed using the Hco norm.Furthermore,a quantitative index for multi-parameter coupling is established using the Hessian matrix.The coupling effects among control parameters are classified as synergistic and antagonistic,providing a scientific basis for adjusting control parameters.Finally,frequency scanning is performed on the DC-side impedance of the studied system to validate it.Simulations are conducted to verify the stability region,first-order sensitivity coefficients,and multi-parameter coupling results,demonstrating the effectiveness of the proposed analytical method.关键词
柔性互联/直流侧阻抗/H∞范数/灵敏度分析/参数耦合Key words
flexible interconnection/DC-side impedance/H∞ norm/sensitivity analysis/parameter coupling分类
信息技术与安全科学引用本文复制引用
王一晗,潘国清,韩民晓,王子厚..基于灵敏度与参数耦合量化分析的柔性互联系统小信号稳定性研究[J].电网技术,2026,50(3):中插96,1223-1233,中插97-中插98,14.基金项目
苏州市关键核心技术"揭榜挂帅"项目:"新型电力系统配网柔性调控设备研发"(SYG2024048).Project Supported by Suzhou Key Core Technology"Challenge and Response"Project:"Research and Development of Flexible Control Equipment for New Power System Distribution Network"(SYG2024048). （SYG2024048）
