采用统一虚拟阻抗控制的逆变器并联系统  

Inverter Parallel System Using Unified Virtual Impedance Control

作　　者：林燎源 戴宇杰 朱铠 项雷军[1] LIN Liaoyuan;DAI Yujie;ZHU Kai;XIANG Leijun(College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2021年第1期91-96,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金青年科学基金资助项目(52007068);福建省自然科学基金资助项目(2019J05089);华侨大学高层次人才科研启动费项目(18BS109)。

摘　　要：多逆变器并联控制常在各逆变单元中添加虚拟阻抗提高功率均分精度,为简化各种工况下并联系统中各逆变单元的虚拟阻抗控制逻辑,提出一种统一虚拟阻抗控制方案.首先,对各逆变器所需的虚拟阻抗值统一进行自适应调节,提高并联系统的功率分配性能,增强供电可靠性;然后,在PLECS软件中搭建由两台逆变器组成的并联系统仿真模型,验证文中方案的有效性.研究结果表明:文中方案能够适应线路阻抗差异,有效提高并联系统稳态功率的均分精度,实现输出功率的灵活分配控制.Parallel control of multiple inverters often adds virtual impedance on each inverter to improve power sharing accuracy.In order to simplify the virtual impedance control logic of each inverter in a parallel system under various working conditions,a unified virtual impedance control scheme is proposed.Firstly,the virtual impedance value required by each inverter is uniformly adjusted adaptively to improve the power distribution performance of the parallel system and enhance the reliability of power supply.Then a parallel system simulation model composed of two inverters is built with PLECS software to verify the effectiveness of the proposed scheme.The research results show that the proposed scheme can adapt to different line impedances,effectively improve the steady-state power sharing accuracy of the parallel system,and realize flexible distribution control of output power.

关 键 词：逆变器 并联 虚拟阻抗 下垂控制 功率分配 

分 类 号：TM921[电气工程—电力电子与电力传动]