热力发电2024，Vol.53Issue(8)：77-84,8.DOI:10.19666/j.rlfd.202405110
基于改进虚拟同步发电机的构网型并联储能逆变器控制研究
Research on VSG control of grid-structured parallel fed inverter based on improved virtual synchronous generator
摘要
Abstract
With the high proportion of new energy connected to power grid,multi-machine parallel coordinated control of energy storage inverter has become a key problem.Virtual synchronous generator(VSG)algorithm can provide damping,inertial support and stable voltage frequency for grid-forming energy storage system.However,the parallel synchronization,stability,state of charge(SOC)of each stack and impedance of each line should be considered in the coordinated control of parallel operation of multiple energy storage inverters.To solve this problem,a parallel mathematical model of energy storage inverter is established,the methods of reactive power allocation considering virtual impedance and active power allocation considering SOC are analyzed,and an improved VSG control strategy combining self-adaptive virtual impedance and SOC equalization is proposed.Finally,a model is built on the MATLAB/Simulink simulation platform,and the coordination control of each energy storage inverter is analyzed under the discharge condition with the all vanadium redox flow battery pack as the energy storage system.The validity of the improved VSG control strategy is verified,and the problem of over-discharge caused by voltage drop,reactive power and SOC difference caused by impedance difference is solved effectively,the utilization efficiency of the battery and the energy storage inverter is improved,and the life loss of the battery is reduced.关键词
构网型储能逆变器/VSG控制/自适应虚拟阻抗/SOC均衡/并联运行Key words
grid-forming energy storage inverter/VSG control/self-adaptive virtual impedance/SOC equalization/parallel operation引用本文复制引用
陈薇,徐佳红,张亚丽,李松,邱亚,仇坤..基于改进虚拟同步发电机的构网型并联储能逆变器控制研究[J].热力发电,2024,53(8):77-84,8.基金项目
国家自然科学基金项目(62202138) National Natural Science Foundation of China(62202138) （62202138）
