计及控制延迟和电网阻抗变化的并网微网内压控逆变器的被动增强控制  

Passive Enhancement Control of Voltage-controlled Inverters in Grid-connected Microgrids Considering Control Delay and Variation in Grid Impedance

作　　者：陈丽 周永博 李瑞琪 卫祥 袁昊 CHEN Li;ZHOU Yongbo;LI Ruiqi;WEI Xiang;YUAN Hao(Information and Communication Corporation,State Grid Gansu Electric Power Company,Lanzhou 730050,China)

机构地区：[1]国网甘肃省电力公司信息通信公司,兰州730050

出　　处：《电源学报》2024年第5期203-212,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51777027)。

摘　　要：随着对环境问题的日益关注,越来越多以微电网为代表的分布式能源系统出现在电力系统中,这给传统电力系统带来挑战。如数字控制系统中的延迟、弱电网中的电网阻抗变化及微电网中并联变换器之间的相互作用等会对微电网稳定运行造成不利影响。基于此,提出1种计及控制延迟和电网阻抗变化的新型微电网形成控制方法,以提升微电网应对不确定性的稳定性。该方法首先对上述问题进行建模,并提出1种延迟补偿方法,提升控制系统对电网阻抗变化的鲁棒性;然后,在控制系统中引入前馈回路,使控制系统免受微电网中并联逆变器的干扰;最后,实验结果验证了所提控制方法的有效性与优越性。With the increasing attention to environmental issues,more and more distributed energy systems represented by microgrids are appearing in the power system,which also poses some challenges to the traditional power systems.For example,the delay in digital control system,variations in grid impedance of weak grid and the interaction between parallel converters in microgrids will cause adverse effects on the stable operation of microgrids.On this basis,a novel type of grid-forming control method for microgrid considering control delay and variation in grid impedance is put forward to enhance the stability of microgrids under uncertainties.First,the above problems are modeled,and a delay compensation method is proposed to improve the robustness of the control system with respect to the variation in grid impedance.Then,a feedforward loop is introduced into the control system to protect it from the interference of parallel inverters in microgrids.Finally,experimental results demonstrate the effectiveness and superiority of the proposed control method.

关 键 词：控制延迟 相互作用 电网形成逆变器 微型电网 稳定 

分 类 号：TM28[一般工业技术—材料科学与工程]