摘要
针对在多逆变器并联的孤岛微电网系统中,各线路之间的阻抗不一致,无功功率不能按需分配以及逆变器之间出现环流等问题,提出了虚拟阻抗策略,采用PR控制代替传统的PI控制,提高系统的稳定性,减小环流对系统的影响,并在虚拟阻抗策略中引入自适应控制,使虚拟阻抗根据系统的无功功率和母线电压自适应调节,从而提高电能质量,仿真实验验证了该策略的有效性。
As the impedance of each line is different in the islanded microgrid system of multi-parallel inverters,the powerless power cannot be distributed according to need and the circulating current appears between different inverters.Therefore,the virtual impedance strategy is proposed in the paper.The traditional PI control is replaced with the PR control to increase system stability and decrease the effects of circulating current on the system.The adaptive control is introduced into the virtual impedance strategy to make virtual impedance regulate adaptively according to powerless power and bus voltage of the system,which raises the power quality.Finally,the simulation experiment verifies the validity of this strategy.
作者
宋帅超
秦斌
SONG Shuai-chao;QIN Bin(College of Electrical&Information Engineering,Hunan University of Technology,Zhuzhou 412007,China)
出处
《电工电气》
2023年第2期23-28,33,共7页
Electrotechnics Electric
基金
国家自然科学基金项目(62033014)
湖南省自然科学基金项目(2021JJ50006)。
