Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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多逆变器并联的微电网无功均分控制策略研究

来源:电工电气发布时间:2023-03-04 11:04 浏览次数:244

多逆变器并联的微电网无功均分控制策略研究

宋帅超,秦斌
(湖南工业大学 电气与信息工程学院,湖南 株洲 412007)
 
    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。
    关键词: 孤岛微电网;下垂控制;虚拟阻抗;PR 控制;自适应控制
    中图分类号:TM464 ;TM712     文献标识码:A     文章编号:1007-3175(2023)02-0023-06
 
Research on Reactive Power Sharing Control Strategy of
Microgrid with Multi-Parallel Inverters
 
SONG Shuai-chao, QIN Bin
(College of Electrical & Information Engineering, Hunan University of Technology, Zhuzhou 412007, China)
 
    Abstract: 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.
    Key words: islanded microgrid; droop control; virtual impedance; PR control; adaptive control
 
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