摘要
光伏发电并网规模持续增长,改变了电力系统大扰动后的动态特性。文章建立了计及低电压穿越(Low Voltage Ride Through,LVRT)功能的光伏发电系统机电暂态仿真模型。针对故障后联系阻抗显著增大的光伏弱交流并网系统,分析了光伏低电压穿越的恢复过程对系统行为特性的影响,揭示了因光伏频繁进入LVRT引起系统电压周期性振荡的机制,分析了相关影响因素,并提出了缓解应对措施。最后,面向西藏中部光伏高渗透实际电网,仿真复现了大扰动后系统振荡现象,验证了应对措施的有效性。
The continuous increase of grid-connected scale of new energy sources will significantly change the security and stability characteristics of power systems after large disturbances,and the stability control will face new challenges.In this paper,the electromechanical transient simulation model of photovoltaic power generation system is established,and the simulation function of low voltage ride through(LVRT)is analyzed.On this basis,the effect of LVRT on the recovery characteristics of a weak ac grid-connected PV system with significantly increased contact impedance is studied,the mechanism of periodic oscillation caused by frequent in-out and low-wear of photovoltaic(pv)is revealed,the related factors of Oscillation are analyzed,and the countermeasures are proposed.The simulation results show the oscillation phenomenon after large disturbance and the effectiveness of corresponding measures for the photovoltaic high permeability power grid in central Tibet.
作者
郭尚文
杨海超
郑超
李惠玲
杨明玉
Guo Shangwen;Yang Haichao;Zheng Chao;Li Huiling;Yang Mingyu(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;Thermal Power Research Institute,Science and Technology Research Instatute Co.,Ltd.,China Datang Group,Beijing 100000,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2023年第4期507-513,共7页
Renewable Energy Resources
基金
国家自然科学基金项目(U2066602)。
关键词
光伏发电
低电压穿越
弱交流并网系统
周期性振荡
应对措施
photovoltaic generation
low voltage ride through
weak AC system
periodic oscillation
counter measures
作者简介
通讯作者:郑超(1977-),男,博士,教授级高级工程师,主要从事电力系统分析与控制方面研究。E-mail:zhengch@epri.sgcc.com.cn。
