引入新型虚拟阻抗的逆变器并联下垂控制策略  

Droop Control Strategy for Parallel Inverters with New Virtual Impedance

作　　者：林克文 肖飞[1] 揭贵生[1] 范学鑫[1] 谢桢[1] LIN Kewen;XIAO Fei;JIE Guisheng;FAN Xuexin;XIE Zhen(National Key Laboratory of Science and Technology on Vessel Integrated Power System,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学舰船综合电力技术国防科技重点实验室,湖北武汉430033

出　　处：《电器与能效管理技术》2019年第1期55-61,68,共8页Electrical & Energy Management Technology

基　　金：国家重点基础研究发展计划(973计划)(2015CB251004);国家自然科学基金(51507184)

摘　　要：针对孤岛运行的微电网中逆变器采用传统下垂控制并联时线路阻抗差异带来的功率分配不均以及输出阻抗带来的输出电压跌落过大的问题,提出了一种新型虚拟阻抗下垂控制方法。通过电压电流环控制参数设计输出阻抗为感性,实现有功功率和无功功率的解耦,满足传统下垂控制要求;无功-幅值下垂控制中引入由固定虚拟阻抗和可变虚拟阻抗两部分组成的新型虚拟阻抗,其中可变虚拟阻抗补偿功率不均分,固定虚拟阻抗补偿电压跌落。通过仿真与试验对比传统下垂控制与改进下垂控制,证明了提出的下垂控制方法能够提高并联系统无功功率均分度同时减小输出电压跌落。Considering that when inverters are parallelled using the traditional droop method in the micro-grid,the difference between line impedance leads to the problem of unequal power distribution and the output impedance leads to the overmigration of output voltages,an improved droop method was proposed.The output impedance is designed to be inductive to meet droop control requirements.The power controller is redesigned and the point of common connection voltage and voltage regulation coefficient are introduced.The effect of line impedance on reactive power distribution and output voltage drop is reduced significantly.Comparing the traditional droop control and the improved droop control through the simulation and experiment,it is proved that the proposed droop control method can improve the reactive power average diversity of the parallel system and reduce the output voltage drop.

关 键 词：逆变器并联 下垂控制 功率均分 电压跌落 虚拟阻抗 

分 类 号：TM464[电气工程—电器]