微电网逆变器并联系统功率均分  

Power Sharing of Microgrid Inverter Parallel System

作　　者：李想 陈肖奇 王继忠[1] 董奕君 LI Xiang;CHEN Xiaoqi;WANG Jizhong;DONG Yijun(Electrical and Information Engineering College of Beihua University,Jilin 132021,China)

机构地区：[1]北华大学电气与信息工程学院,吉林吉林132021

出　　处：《北华大学学报（自然科学版）》2023年第5期694-700,共7页Journal of Beihua University（Natural Science）

摘　　要：下垂控制是微电网中的主要控制策略.在低压微电网逆变器并联控制中,传统的下垂控制因逆变器的线路阻抗不匹配,导致输出功率分配不均、系统环流增大、稳定性降低.基于均值耦合补偿思想提出自适应虚拟阻抗,提高了无功功率均分程度;引入补偿环节,解决虚拟阻抗加入导致的母线电压跌落问题,提高系统的有效性和鲁棒性;在Simiulink平台搭建仿真模型.仿真结果显示:增加自适应虚拟阻抗后,无功功率均分效果良好;加入电压补偿环节,逆变器的输出电压由306 V抬升至309.7 V,验证了该控制策略的可行性.Droop control is the main control strategy in microgrids.In the parallel connection of low-voltage microgrid inverters,traditional droop control results in uneven output power distribution,increased system circulation,and reduced stability due to mismatched line impedance of the inverters.Based on the idea of mean coupling compensation,an adaptive virtual impedance is proposed to improve the degree of reactive power equalization;Introduce a compensation link to solve the problem of bus voltage drop caused by virtual impedance addition,and improve the effectiveness and robustness of the system;Building a simulation model on the Simulink platform,the simulation results show that the reactive power equalization effect is good after adding adaptive virtual impedance;After adding voltage compensation,the output voltage of the inverter was raised from 306 V to 309.7 V,verifying the feasibility of this control strategy.

关 键 词：微电网 下垂控制 自适应 虚拟阻抗 逆变器并联 

分 类 号：TM464[电气工程—电器]