Research On Coordinated Control Strategy Of AC/DC Hybrid Microgrid

With the emergence of energy crisis and environmental problems,as well as the increasing requirement of users for power supply reliability and quality,by virtue of cleanliness,micro,friendship and autonomy,microgrid has become a hot research topic both home and abroad.The microgrid can effectively integrate various types of distributed generations and switch flexibly between island operation and grid-connected operation,so as to improve the power quality and power supply reliability.In order to ensure the safe and reliable operation of the AC/DC hybrid microgrid,it is necessary to adopt a reasonable control strategy for distributed power supplies,energy storage devices,and other devices based on their operational control modes.This paper focuses on studying the coordinated control strategies of hybrid AC/DC microgrid.The main work done is as follows:Corresponding to the actual hybrid AC/DC microgrid program of wind/ PV/water storage smart microgrid demonstration project,the paper constructed the AC/DC hybrid microgrid structure.The paper briefly introduced the photovoltaic power generation system,energy storage system,load system,coordinated controller and energy management system,simplifying the structure and building the model of photovoltaic system and energy storage system.According to the access situation of AC and DC sides' devices,it put forward a coordinated control strategy for master-slave control architecture and built simulation model in Simulink,verifying the feasibility of the control strategy above.The paper researched the startup and operation modes of AC/DC microgrid,analyzing the conversion conditions and compatibility between each mode,and put forward the control methods in grid-connected operation mode and off-grid operation mode,making use of the simulation platform to carry out simulation verification on the switching process.