异时接入逆变器功率均衡和电压无静差下垂控制  

Droop Control of Non-Simultaneously Cut-In Inverters with Balanced Power and Zero Voltage Static Error

作　　者：朱贤文 李秋硕 舒杰[2] 刘梦华 王浩[2] 吴昌宏[2] ZHU Xianwen;LI Qiushuo;SHU Jie;LIU Menghua;WANG Hao;WU Changhong(Digital Grid Research Institute,CSG,Guangzhou 510663,China;Key Laboratory of Renewable Energy,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China)

机构地区：[1]南方电网数字电网研究院有限公司,广州510663 [2]中国科学院广州能源研究所可再生能源重点实验室,广州510640

出　　处：《南方电网技术》2023年第5期100-108,116,共10页Southern Power System Technology

基　　金：国家重点研发计划政府间国际科技创新合作项目(2019YFE0120200);南方电网数字电网研究院创新项目(670000KK52200084)。

摘　　要：为实现无通信条件下逆变器输出功率均衡且电压(频率、幅值)无静差,研究了微电网孤岛状态下异时接入逆变器的下垂控制。首先阐述异时接入逆变器基于目前下垂控制方案所存在的问题,即无法兼顾输出功率均衡和电压无静差;再分析得出为确保各逆变器输出功率均衡下垂控制的一般规则;然后,基于该规则提出一种改进的下垂控制方案,该方案通过一种特定的空载电压频率和幅值修正方式实现各逆变器输出功率均衡和电压无静差,且无需通信;最后通过仿真测试验证了所得结论,表明所提出的改进下垂控制方案达到了预期效果,解决了逆变器异时接入情况下存在的控制问题。This paper studies on the droop control of non-simultaneously cut-in inverters in islanded microgrid,which is aimed at achiev⁃ing balanced power between inverters and voltage(frequency and amplitude)without static error by no communication.Firstly,this paper indicates an issue with non-simultaneously cut-in inverters based on current droop control scheme,i.e.,unable to ensure balanced power and voltage without static error at the same time.Next,in order to ensure balanced power between inverters,a general rule is derived.And then an improved droop control scheme based on the rule is proposed.This scheme adopts a specific correction method of no-load voltage frequency and amplitude,which can control the voltage to be without static error and the output power of inverters to be balanced without communication.The conclusions of this paper have been verified by the final simulations,which demonstrate that the proposed droop control scheme reaches the expected effect and solves the issue with non-simultaneously cut-in inverters.

关 键 词：下垂控制 微电网 孤岛 电压静差 功率均衡 

分 类 号：TM61[电气工程—电力系统及自动化]