摘要
随着基于电力电子变换器的电力装备在电力系统中渗透率的不断提高,并网变换器对系统的动态特性和稳定性的影响不断增强。电网阻抗同时影响跟网变换器的电流暂态和锁相环暂态,对跟网变换器的同步暂态响应以及变换器并网系统的同步稳定性有着复杂的影响。文章在考虑锁相环暂态和电流暂态的同时,研究电网阻抗比对跟网变换器同步稳定性的影响机理。首先建立考虑电网电阻和电流暂态的跟网变换器并网系统四阶同步稳定模型,接着提出故障瞬间锁相环频率偏差和电流变化量估计方法,分析电网阻抗比对频率暂态和电流暂态的影响规律。最后,通过Matlab/Simulink仿真,验证理论分析的正确性。
With the increase of the penetration of power electronic converter based electrical equipment in power system,the influence of the grid-tied converter on the dynamic characteristics and stability of the system strengthens gradually.The impedance of power grid affects both the transients of current and phase-locked loop(PLL)of grid-following converter(GFL).Besides,it has complex influences on the synchronization transient response of GFL and the synchronization stability of the power grid tied with GFL.This paper investigates the influence mechanism of R/X ratio of power grid on the synchronization stability of GFL under the consideration of the PLL and current transients.First,the 4th order synchronization stability model of power grid tied with GFL considering the resistance of power grid and the current transient is established.Then,the estimation method of PLL frequency deviation and current change at the instant of fault is proposed.The influence laws of R/X ratio of power grid on the frequency and current transients are further analyzed.Finally,the theoretical analyses are verified by simulations in Matlab/Simulink.
作者
陈俊儒
李冠群
刘牧阳
叶华
CHEN Junru;LI Guanqun;LIU Muyang;YE Hua(School of Electrical Engineering,Xinjiang University,Urumqi 830046,Xinjiang Uygur Autonomous Region,China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education(Shandong University),Jinan 250061,Shandong Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2023年第6期2331-2338,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(52077126)
新疆维吾尔自治区自然科学基金项目(2021D01C086)。
关键词
同步稳定性
锁相环
暂态响应
跟网型变换器
synchronization stability
phase locked loop
transient response
grid-following converter
