基于导纳矩阵与圆盘估计的多节点直流配电系统谐振稳定性分析方法  

A Method for Resonance Stability Analysis of Multi-bus DC Distribution System Based on Admittance Matrix and Disc Estimation

作　　者：赵文梦 陈鹏伟 姜文伟 陈新[1] 李欢 ZHAO Wenmeng;CHEN Pengwei;JIANG Wenwei;CHEN Xin;LI Huan(Jiangsu Key Laboratory of New Energy Generation and Power Conversion(Nanjing University of Aeronautics and Astronautics),Nanjing 211106,Jiangsu Province,China;State Key Laboratory of DC Power Transmission Technology(Southern Power Grid Research Institute Co.,Ltd.),Guangzhou 510663,Guangdong Province,China)

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),江苏省南京市211106 [2]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663

出　　处：《中国电机工程学报》2023年第16期6242-6254,共13页Proceedings of the CSEE

基　　金：直流输电技术国家重点实验室开放基金项目(SKLHVDC-2021-KF-10)。

摘　　要：为充分利用多节点直流配电系统节点导纳矩阵建模的便利性,同时实现谐振稳定性的高效判定,该文在接口变换器直流阻抗降阶建模的前提下,结合节点导纳矩阵对广义奈奎斯特(Nyquist)判据进行拓展,并应用Ward等值,给出采用特征值谐振频率与阻尼因子的简化判据。进而为满足快速判稳需求,提出圆盘估计和牛顿法迭代相结合的特征值谐振频率(阻尼因子)求解方法。最后,以三端直流配电系统为例,通过对比状态空间特征值轨迹、矩阵广义Nyquist曲线和MATLAB/Simulink时域仿真,验证所提稳定性分析方法的有效性和高效性。In order to make full use of the convenience of the node admittance matrix modeling of the multi-node DC distribution system and realize the efficient determination of resonant stability,this paper extends the generalized Nyquist criterion by combing the node admittance matrix on the premise of the reduced-order modeling of the DC impedance of the interface converter,and uses Ward equivalent to give a simplified criterion applying the eigenvalue resonant frequency and damping factor.Furthermore,in order to meet the needs of rapid stability determination,a solution method of eigenvalue resonant frequency(damping factor)combining disc estimation and Newton iteration is proposed.Finally,taking the three-terminal DC distribution system as an example,the effectiveness and efficiency of the proposed stability analysis method is verified by comparing the eigenvalue trajectories in state space,the generalized Nyquist curves of transfer matrix and the time-domain simulation using MATLAB/Simulink.

关 键 词：直流配电系统 节点导纳矩阵 广义奈奎斯特(Nyquist)判据 阻尼因子 圆盘估计 

分 类 号：TM711[电气工程—电力系统及自动化]