基于Lyapunov直接法的虚拟同步发电机并网暂态稳定性分析  

Transient Stability Analysis on Virtual Synchronous Generators Integration Based on Lyapunov’s Direct Method

作　　者：高振 雷为民 赵峰 刘辉 程雪坤[3,4] 巨云涛 GAO Zhen;LEI Weimin;ZHAO Feng;LIU Hui;CHEN Xuekun;JU Yuntao(College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China;State Grid Jibei Electric Power Co.,Ltd.,Beijing 100053,China;State Grid Jibei Electric Power Research Institute (North China Electric Power Research Institute Co.,Ltd.,),Beijing 100045,China;State Grid Key Laboratory for Grid-Connected Operation Technology for Wind-hotovoltaic-Storage Hybrid System,Beijing 100045,China)

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]国网冀北电力有限公司,北京100053 [3]国网冀北电力科学研究院(华北电力科学研究院有限责任公司),北京100045 [4]国家电网公司风光储并网运行技术实验室,北京100045

出　　处：《浙江电力》2019年第10期52-60,共9页Zhejiang Electric Power

摘　　要：VSG(虚拟同步发电机)由于电流限幅、阻尼大等特性,接入电网后对系统稳定性会产生影响。搭建了一种较为准确的VSG模型,在计及VSG特性的情况下,采用Lyapunov直接法对接有VSG的单机无穷大系统进行暂态稳定性分析,并用时域仿真的结果来验证其准确性。结果表明:VSG接在四机两区域系统的受端相比送端,临界能量更小,系统更容易失稳;将VSG接在送端时,增加VSG的占比,临界能量呈减小的趋势,系统失稳的可能性增大。VSG(virtual synchronous generator) has its characteristics such as current limit and large damping,which affect the stability of the system after it is connected to the grid. A more accurate VSG model is built. Considering the characteristics of current limit and large damping of VSG,the Lyapunov direct method is used to analyze the transient stability of the single-machine infinity system with VSG and the results of the time-domain simulation are used to verify its accuracy. The results show that when VSG is connected to the receiving end of the four-machine two-zone system,the critical energy is smaller,and the system is more susceptible to instability;when the VSG is connected to the transmitting end,the proportion of VSG is increased,the critical energy is decreased,and the possibility of system instability is increased.

关 键 词：虚拟同步发电机 电流限幅 大阻尼 LYAPUNOV直接法 暂态稳定性 

分 类 号：TM464[电气工程—电器]