摘要
随着接入电网的电力电子逆变器的增多,逆变器与电网交互导致的稳定性问题越来越突出。逆变器在接入电网之前有必要进行稳定性校验,以确保逆变器接入电网之后系统能安全稳定运行。为此,文中提出一种基于阻抗测量的多逆变器系统稳定性校验方法,用于多个逆变器接入电网前的稳定性校验。同时,还提出利用主动式阻抗灵敏度分析方法识别造成系统失稳的主导逆变器,为确定并网方案提供依据。应用案例研究表明所提方法适用于多逆变器系统稳定性校验分析,仿真和实验验证了所提方法的有效性。
With more and more power electronic inverters connecting to the power grid,the stability problems caused by the interaction between the inverters and the power grid become increasingly prominent.Therefore,it is necessary to check the stability of the inverter before grid-connection,to ensure the safe and stable operation of the system after the inverter is connected to the power grid.Therefore,this paper proposes a stability check method for the multi-inverter system based on impedance measurement,to check the stability of multiple inverters before grid-connection.This paper also proposes an active impedance sensitivity analysis method for the identification of the dominant inverters that cause system instability,to provide the guidance for the determination of the grid-connection plan.The application case study shows that the proposed method is suitable for the stability check analysis of the multi-inverter system,and the effectiveness of the proposed method is verified by the simulation and the experiment.
作者
李杨
帅智康
方俊彬
吴向阳
LI Yang;SHUAI Zhikang;FANG Junbin;WU Xiangyang(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第11期95-101,共7页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2018YFB0904100)
国家电网公司科技项目(SGHB0000KXJS1800685)。
关键词
并网逆变器
小信号稳定性分析
稳定性校验
多逆变器系统
阻抗测量
阻抗灵敏度
grid-connected inverter
small-signal stability analysis
stability check
multi-inverter system
impedance measurement
impedance sensitivity
