高电压技术2024，Vol.50Issue(11)：4802-4811,10.DOI:10.13336/j.1003-6520.hve.20240393
基于势能界面的带锁相环变流器暂态同步稳定裕度评估
Transient Synchronizing Stability Margin Assessment of Phase-locked Synchronous Inverter Based on Potential Energy Boundary Surface
摘要
Abstract
The issue of transient synchronization stability of phase-locked loop(PLL)synchronized converters connected to weak power grids is one of the main challenges in power systems with a high proportion of renewable energy.This pa-per,based on the dynamic process analysis of PLL-controlled converters under large disturbances,proposes an assessment method for the transient synchronization stability margin of such converters.This method is based on the transformation of virtual kinetic and potential energy during the acceleration and deceleration processes of the PLL.By extending the virtual power angle trajectory to approximate the boundary of the PLL dynamic system's stable domain and using the critical potential energy at the boundary exit point as an approximation of the local stability boundary,the stability margin is defined by calculating the distance between the PLL energy after fault recovery and the critical potential energy inter-face.The proposed method can be adopted to effectively assess the transient synchronization stability margin of phase-locked control converters.Compared to the results of existing methods,the evaluation results are closer to the true stability boundary,meeting the quantitative analysis needs for converter-driven stability in power systems.The correct-ness of the conclusions is verified by building and calculating a simulation model in MATLAB/Simulink.关键词
锁相环同步/电压源型变流器/暂态同步稳定/势能/轨迹延拓/稳定裕度Key words
phase-locking loop synchronization/voltage source converter(VSC)/transient synchronizing stability/po-tential energy/trajectory continuation/stability margin引用本文复制引用
鲍颜红,吴峰,任先成,张金龙,徐泰山..基于势能界面的带锁相环变流器暂态同步稳定裕度评估[J].高电压技术,2024,50(11):4802-4811,10.基金项目
国家电网有限公司总部科技项目(5100-202140498A-0-5-ZN).Project supported by the Headquarters Science and Technology Project of SGCC(5100-202140498A-0-5-ZN). （5100-202140498A-0-5-ZN）
