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
鲍颜红 1吴峰 2任先成 1张金龙 1徐泰山1
作者信息
- 1. 南瑞集团有限公司(国网电力科学研究院有限公司),南京 211106;电网运行风险防御技术与装备全国重点实验室,南京 211106
- 2. 南瑞集团有限公司(国网电力科学研究院有限公司),南京 211106;电网运行风险防御技术与装备全国重点实验室,南京 211106;东南大学电气工程学院,南京 210096
- 折叠
摘要
接入弱电网带锁相环变流器的暂态同步稳定问题是新能源高占比电力系统主要的稳定问题之一.该文在大扰动下锁相控制变流器动态过程分析基础上,基于锁相环加减速过程中虚拟动能和势能的相互转化,提出了一种锁相控制变流器暂态同步稳定裕度的评估方法.通过延拓虚拟功角轨迹局部逼近锁相环动态系统的稳定域边界,以边界出口点处的临界势能近似局部临界暂态能量,通过计算故障恢复后锁相环能量和临界势能界面的距离定义其稳定裕度.所提方法可以有效评估锁相控制变流器暂态同步稳定裕度,相比已有方法评估结果更逼近真实的稳定域边界,满足电力系统变流器驱动稳定性的量化分析需求,在 MATLAB/Simulink 中搭建仿真模型计算验证结论的正确性.
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
出版年
2024
国家科技期刊平台
NSTL
万方数据