基于广义奈奎斯特判据的新能源多场站系统小信号稳定薄弱并网单元辨识  

Identification of grid-connected units with the weakest small‑signal stability in multiple renewable energy stations based on generalized Nyquist criterion

作　　者：陈波 斯琪 谌艳红 陶翔 王凯 朱晓娟[2] 吴志平 张永生 CHEN Bo;SI Qi;CHEN Yanhong;TAO Xiang;WANG Kai;ZHU Xiaojuan;WU Zhiping;ZHANG Yongsheng(Electric Power Research Institute,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330077,China;New Energy Power Generation Branch,State Power Investment Group Jiangxi Electric Power Co.,Ltd.,Nanchang 330038,China;Huaneng Jiangxi Clean Energy Co.,Ltd.,Nanchang 330038,China;Jiangxi New Energy and Storage Safety Operation Control Engineering Research Center,Nanchang 330096,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330096 [2]西南交通大学电气工程学院,四川成都610031 [3]国网江西省电力有限公司,江西南昌330077 [4]国家电投集团江西电力有限公司新能源发电分公司,江西南昌330038 [5]华能江西清洁能源有限责任公司,江西南昌330038 [6]江西省新能源与储能安全运行控制工程研究中心,江西南昌330096

出　　处：《电力科学与技术学报》2024年第5期129-140,共12页Journal of Electric Power Science And Technology

基　　金：国网江西省电力有限公司科技项目(521820220006)。

摘　　要：大量新能源并网变流器接入电网极易引发小信号失稳,严重威胁系统的安全与稳定。现有的阻抗法小信号稳定性分析基于多机等效机制,仅能给出稳定性的影响因素分析,无法识别关键的稳定薄弱并网单元。该文提出一种基于广义奈奎斯特判据(generalized Nyquist criterion,GNC)的新能源多场站系统小信号稳定薄弱并网单元辨识方法。先基于GNC的稳定性分析思路,将多个不同控制参数的新能源场站解耦成多组单场站子系统;再构建每个子系统的稳定判据,分析各子系统的小信号稳定性;最后,依据子系统的小信号稳定性,找出稳定性最薄弱的子系统。研究结果表明,相较于现有方法,该方法能更准确、快速地识别小信号稳定薄弱并网单元,为系统稳定性的提升提供针对性的指导建议。The integration of a large number of renewable energy grid-connected converters into the power grid can easily trigger small-signal instability,posing a serious threat to the safety and stability of the system.The existing smallsignal stability analysis using the impedance method,based on a multi-machine equivalent mechanism,can only provide an analysis of the factors influencing stability and cannot identify the key weak grid-connected units that affect stability.This paper proposes a method for identifying small-signal stability weak grid-connected units in a renewable energy multi-site system based on the generalized Nyquist criterion(GNC).Firstly,based on the stability analysis approach of GNC,multiple renewable energy sites with different control parameters are decoupled into multiple singlesite subsystems.Then,a stability criterion is constructed for each subsystem to analyze the small-signal stability of each subsystem.Finally,the subsystem with the weakest stability is identified based on the small-signal stability of each subsystem.The research results show that,compared with existing methods,this method can more accurately and quickly identify small-signal stability weak grid-connected units,providing targeted guidance and suggestions for improving system stability.

关 键 词：并网变流器 新能源多场站系统 小信号稳定 稳定薄弱并网单元 广义奈奎斯特判据 

分 类 号：TM712[电气工程—电力系统及自动化]