张怡静,丁浩寅,时艳强,黄志光,钟伟伦,徐波
ZHANG Yijing,DING Haoyin,SHI Yanqiang,HUANG Zhiguang,ZHONG Weilun,XU Bo

• 1:国家电网有限公司华东分部
• 2:上海电力大学电气工程学院

摘要(Abstract)：

为了深入分析VSC-HVDC（基于电压源换流器的高压直流输电）系统宽频振荡失稳的机理并快速准确评估系统的稳定性，提出一种基于z域阻抗的建模方法和稳定性判据。首先，基于精确离散化的方法，分别建立了考虑锁相环、电流内环和电压前馈控制的电压源型变流器z域阻抗模型，以及交流电网在全局坐标系下的z域阻抗模型。然后，基于盖尔圆定理提出广义禁区判据，分析了锁相环和线路阻抗对系统稳定性的影响。最后，搭建VSC-HVDC仿真系统进行分析，证明了所提广义阻抗判据的有效性。
To delve into the mechanism behind wideband oscillation instability in voltage source converter based high voltage direct current(VSC-HVDC) transmission system and swiftly assess system stability with precision, a modeling method and a stability criterion based on z-domain impedance are proposed. Firstly, employing precise discretization techniques, a z-domain impedance model is established for voltage-source converters considering phaselocked loops(PLLs), inner-current loop, and voltage feedforward control, along with a z-domain impedance model for AC grids in a global coordinate system. Subsequently, a criterion for generalized forbidden zone is proposed using Gershgorin circle theorem to analyze the impact of phase-locked loops and line impedances on system stability.Finally, simulation analysis is conducted on the VSC-HVDC system to demonstrate the effectiveness of the proposed generalized impedance criterion.

关键词(KeyWords)： 宽频振荡;VSC-HVDC;稳定性分析;阻抗模型;离散化
wideband oscillation;VSC-HVDC;stability analysis;impedance model;discretization

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司华东分部科技项目（52080023002J）

作者(Author): 张怡静,丁浩寅,时艳强,黄志光,钟伟伦,徐波
ZHANG Yijing,DING Haoyin,SHI Yanqiang,HUANG Zhiguang,ZHONG Weilun,XU Bo

DOI: 10.19585/j.zjdl.202407012

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