Experimental Study On A Small AC/DC Hybrid Microgrid System

As an effective way to utilize the distributed renewable energy,the microgrid can improve the ability to accept the distributed power and play a more important role in the distributed power supply and realize the reliable power supply to the load,which has important practical research significance.In this paper,a small AC/DC hybrid microgrid system based on switch array mechanism was researched,which improved the utilization rate of distributed renewable energy,and realized the effective management of the microgrid and the reliable operation of the load.The main research contents of this paper are as follows:1.At first,the research progress and research significance of the microgrid energy management were introduced.Then the existing problems in the utilization of distributed renewable energy were analyzed.The research status of microgrid field in domestic and abroad,the distributed generation technology and the distributed energy storage technology commonly used in the microgrid system were analyzed and summarized.In addition,the basic structures and characteristics of the typical microgrids were concluded on this foundation.2.The topological structure of the small AC/DC hybrid microgrid system based on switch array mechanism was put forward and its system characteristics were analyzed.The operating mode of the system and the characteristics of different operating modes and their conversion were introduced,which provided a theoretical support for the overall construction and implementation of the small AC/DC hybrid microgrid system.3.The complete experimental platform of the small AC/DC hybrid microgrid system was built,and the important equipments of this microgrid system were specifically selected,which consists of photovoltaic power generation system,battery energy storage system,boost converter and system main inverter.Then,the basic experiment and analysis on the system were carried out,realizing the stable and reliable operation of different operation modes.4.According to the structure characteristics of the small AC/DC hybrid system,the fuzzy algorithm was applied to the experimental system,realizing the effective management of the power supply side,the load side and the energy storage and the stable operation of the system.In this paper,the distributed power,energy storage devices and load connected to the small AC/DC hybrid microgrid system could be monitored and controlled.According to the situation of load power consumption,the energy storage could be controlled to adjust the power balance of the system,which improved the operation stability and reliability of microgrid system,and achieved the effective management and control of the renewable energy source and the load.