可再生能源2025，Vol.43Issue(5)：681-686,6.
基于交流信号注入的并联均流策略研究
Research on parallel current sharing strategy based on AC signal injection
摘要
Abstract
Droop control is a common current sharing method for parallel converters in DC microgrid.However,due to the inconsistency of line parameters and the sampling error of sensors,the current distribution accuracy of traditional droop control is low.In order to solve this problem,this paper proposes a parallel current sharing strategy based on AC signal injection.Firstly,by superimposing an AC voltage small signal on the output voltage of the converter,the droop characteristic between the frequency of the AC voltage and the output current of the converter is constructed,and the reactive power generated by the signal and the feedback mechanism are used to realize the accurate current sharing of the converter.Secondly,the compensation virtual resistance is introduced to improve the stability of the system when the load changes greatly.Then,the design mode switching link stops the injection of AC signals in the steady state,so that the power quality can be improved.Finally,the effectiveness of the proposed control strategy is verified by simulation results.关键词
直流微电网/下垂控制/并联均流/交流信号注入/虚拟电阻Key words
DC microgrids/droop control/current sharing/AC signal injection/virtual resistance分类
能源科技引用本文复制引用
薛阳,杨江天,李金星,李清,丁凯..基于交流信号注入的并联均流策略研究[J].可再生能源,2025,43(5):681-686,6.基金项目
国家自然科学基金(52075316) （52075316）
上海市2021年度"科技创新行动计划"(21DZ1207502) （21DZ1207502）
国网浙江省电力有限公司科技项目(5211HZ17000F). （5211HZ17000F）
