中国电机工程学报2025，Vol.45Issue(24)：9680-9692,中插17,14.DOI:10.13334/j.0258-8013.pcsee.242961
考虑充放电模式的构网型储能变流器暂态同步稳定研究
Research on Transient Synchronization Stability of Grid-forming Power Converse System Considering Charge and Discharge Mode
摘要
Abstract
Power converse system(PCS)has weak over-current capability under fault.The virtual impedance strategy can limit the fault current,but it will deeply affect the transient synchronization instability of PCS under charge discharge mode.To solve this problem,this paper first reveals the power angle instability mechanism of PCS in the charge and discharge mode.It is concluded that the acceleration instability pattern similar to the traditional synchronous machine will appear in the PCS discharge mode,but the deceleration instability pattern will appear in the charge mode.Then,it is found that the virtual impedance ratio has the opposite effect on the two types of power angle instability pattern,which indicates that the fixed virtual impedance ratio can not ensure that PCS has good transient stability margin under both operating modes.Therefore,a virtual impedance strategy with variable impedance ratio is proposed.According to the change of angular velocity under PCS fault,the virtual impedance ratio is adaptively selected to enhance the transient stability margin of PCS in charge discharge mode.Finally,simulation and experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed strategy.关键词
构网型变流器/同步失稳/虚拟阻抗策略Key words
grid-forming converter/synchronization instability/virtual impedance strategy分类
信息技术与安全科学引用本文复制引用
韩鹏,徐式蕴,汪乐天,孙华东,毕经天..考虑充放电模式的构网型储能变流器暂态同步稳定研究[J].中国电机工程学报,2025,45(24):9680-9692,中插17,14.基金项目
国家自然科学基金项目(U2166601) （U2166601）
国家资助博士后研究人员计划(GZB20230688).Project Supported by National Natural Science Foundation of China(U2166601) （GZB20230688）
Postdoctoral Fellowship Program of CPSF(GZB20230688). （GZB20230688）
