基于微电网运行模式识别的逆变器自适应控制结构  

Adaptive Control Structure of Inverter Based on Microgrid Operation Mode Identification

作　　者：蒋闻 李骊 赵晋 唐文左 张程柯 雷霞 JIANG Wen;LI Li;ZHAO Jin;TANG Wenzuo;ZHANG Chengke;LEI Xia(Economic Research Institute,State Grid Chongqing Electric Power Company,Chongqing 401120,China;School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,China;State Grid Neijiang Electric Power Supply Company,Neijiang 641000,China)

机构地区：[1]国网重庆市电力公司经济技术研究院,重庆401120 [2]西华大学电气与电子信息学院,成都610039 [3]国网内江供电公司,内江641000

出　　处：《电力系统及其自动化学报》2019年第9期78-82,103,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目（51677020）;教育部春晖计划资助项目(Z2016145)

摘　　要：微电网离网过程涉及到并网开关的关断和逆变器控制方式的改变,两者动作完成时间的差异使微电网进入异常运行模式,从而影响微电网离网过程的稳定性。针对这一时序问题提出了一种微电网模式识别函数,该函数通过比较微电网和大电网的频率差来判断微电网运行模式;然后利用模式识别函数对逆变器控制结构进行改进,使逆变器能够在微电网孤网运行时自动切换为VF控制方式,并网运行时自动切换为PQ控制方式;最后,将自适应控制逆变器应用于微电网的离网过程,仿真验证了其对微电网离网过程的改善效果。The off-grid process of microgrid is related to the switching off of the grid-connected switch and the change in the inverter control mode.The time difference between these two actions will make the microgrid go to an abnormal oper?ation mode,thus affecting the stability of the off-grid process.To solve this time-sequence problem,a mode identifica?tion function of microgrid is put forward,which can be used to judge the operation mode of microgrid by comparing the frequency difference between the microgrid and large power grid.Then,this function is used to improve the inverter con?trol structure,making the inverter switch to VF control mode automatically during the isolated operation of microgrid and to PQ control mode during the grid-connected operation.Finally,the adaptive control inverter is applied to the offgrid process of microgrid,and simulation results show that the proposed inverter can improve the stability of off-grid pro?cess.

关 键 词：时序配合 模式识别 自适应逆变器结构 微电网控制 

分 类 号：TM464[电气工程—电器]