弱联络条件下并网虚拟同步发电机小干扰稳定分析  

Analysis of small-signal stability of grid-connected VSG under weak grid connection

作　　者：柯贤波 孙谊媊 任冲 王衡 亢朋朋 高瑞林[3] KE Xianbo;SUN Yiqian;REN Chong;WANG Heng;KANG Pengpeng;GAO Ruilin(Northwest Branch of State Grid Corporation of China,Xi'an 710048,China;State Grid Xinjiang Electric Power Company,Urumchi 830063,China;School of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]国家电网公司西北分部,西安710048 [2]国网新疆电力有限公司,乌鲁木齐830063 [3]四川大学电气工程学院,成都610065

出　　处：《电测与仪表》2024年第9期101-106,共6页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司总部管理科技项目资助“新能源场群集中式频率校正控制关键技术研究”(5100-202036013A-0-0-00)。

摘　　要：文中研究了弱联络条件下并网虚拟同步发电机的小干扰振荡稳定性问题。首先,建立了并网虚拟同步机的简化线性化模型;然后,结合劳斯稳定判据理论,推导了并网虚拟同步机的小干扰稳定性判据。对稳定性判据的进一步分析表明:无论电网强度以及控制参数变动,并网虚拟同步机总能保持稳定运行。所以,弱联络条件不会给并网虚拟同步机带来振荡失稳问题。最后通过仿真算例,演示并验证了理论分析的正确性。This paper analyzes the small-signal oscillation stability of a grid-connected VSG under weak gird connec-tion.Firstly,simplified linearized model of grid-connected VSGs is established.Secondly,based on the Routh stabil-ity criterion theory,the small-signal stability criterion of grid-connected VSGs is derived.Further analysis of the sta-bility criterion shows that the grid-connected VSGs can always maintain stable operation when the power grid strength or control parameter varies.Therefore,weak grid connection condition will not cause small-signal instability of grid-connected VSGs.Finally,simulation cases demonstrate and verify the correctness of the theoretical analysis.

关 键 词：并网虚拟同步发电机 小干扰稳定性 弱联络 

分 类 号：TM341[电气工程—电机]