基于改进下垂的多逆变器并联控制策略  

Parallel Control Strategy of Multiple Inverters Based on Improved Droop

作　　者：罗军杰 粟时平[1] 倪亮 李志轩 苏乾坤 LOU Junjie;SU Shiping;NI Liang;LI Zhixuan;SU Qiankun(School of electrical and information engineering,Changsha University of technology,Changsha 410114)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电力电容器与无功补偿》2024年第2期169-176,共8页Power Capacitor & Reactive Power Compensation

摘　　要：针对微电网孤岛运行时,传统解耦式下垂控制策略由于未能考虑线路阻抗的影响,多逆变器并联运行时存在无功功率分配不均、环流等问题,论文提出一种基于自适应电压补偿的改进下垂控制策略。文中首先针对因线路阻抗不同所带来的电压跌落问题,增加了线路压降补偿环节,在此基础上,考虑逆变器出口处电压与母线电压的一致性,改进了下垂控制式,并利用低带宽通信技术获取各逆变器输出功率信息,引入自适应电压补偿环节,提高了逆变器间无功功率的均分精度。最后,基于Matlab平台搭建文章所提控制策略的仿真模型,仿真结果验证了所提控制策略的正确性与有效性。In view of such problems as not consideration the influence of line impedance of the line under the traditional decoupling droop control strategy,the uneven reactive power distribution and circulating current of multiple inverters in parallel operation in the case of isolated island operation of micro grid,a kind of improved droop control strategy based on adaptive voltage compensation is proposed in this paper.Firstly,aiming at the voltage drop caused by different line impedance,the line voltage drop compensation link is added.On this basis,considering the consistency between the voltage at the outlet of the inverter and the bus voltage,the droop control type is improved,the output power information of each inverter is obtained by using low bandwidth communication technology,and the adaptive voltage compensation link is introduced to improve the accuracy of reactive power sharing between inverters.Finally,the simulation model of the proposed control strategy is set up based on Matlab platform,and the the correctness and effectiveness of the proposed control strategy is verified.

关 键 词：微电网 下垂控制 线路阻抗 功率均分 电压补偿 

分 类 号：TM464[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]