储能科学与技术2024，Vol.13Issue(5)：1532-1541,10.DOI:10.19799/j.cnki.2095-4239.2023.0818
基于虚拟母线电压控制的构网型储能变流器稳定性优化研究
Investigation of stability optimization of grid-forming energy storage converters based on virtual bus voltage control
摘要
Abstract
Since key equipment of new energy technology is connected to the power grid,grid-forming energy storage converters have stability problems in strong power grids.Aiming to resolve this problem,this study proposes a method for stability optimization of grid-forming energy storage converters based on virtual bus voltage control.First,the state space small signal model of a grid-forming energy storage converter is established,and the characteristic root analysis method is used to obtain the stability conditions of the grid-forming energy storage converter that becomes worse or even oscillates under strong power grid conditions.Subsequently,a stability optimization method based on virtual bus voltage control is proposed.By changing the position of the active power loop tracking the grid voltage phase,the grid impedance is equivalently improved,thus improving the stability of the grid-forming energy storage converter system under strong power grid conditions.Subsequently,the eigenvalue change trend and stability improvement effect of the converter system before and after adding the virtual bus voltage control under different working conditions are analyzed.Simultaneously,the influence of the compensation coefficient k and the time constant t in the virtual bus voltage control parameters on the stability of the converter system is analyzed and the general parameter design range is provided.Finally,a grid-forming model of the grid-forming energy storage converter is built in MATLAB/Simulink for time-domain verification,and a hardware-in-the-loop experimental platform is further built for semi-physical verification.The study results show that the stability of the grid-forming energy storage converter based on virtual bus voltage control is significantly improved under strong power grid conditions.关键词
构网型储能/小信号稳定性/虚拟母线电压控制/稳定性优化Key words
grid-following energy storage/small-signal stability/virtual bus voltage control/stability optimization分类
信息技术与安全科学引用本文复制引用
严文博,黄云辉,王栋,唐金锐,周克亮..基于虚拟母线电压控制的构网型储能变流器稳定性优化研究[J].储能科学与技术,2024,13(5):1532-1541,10.基金项目
国家重点研发计划(2021YFB2601602),国家自然科学基金青年项目(52307217). （2021YFB2601602）
