Research On Control Strategy Of Microgrid With Distributed Sources

At present,the traditional fossil energy reserves are getting lower and lower and the price is rising,the use of clean energy generation has become an inevitable trend.The distributed generation such as photovoltaic power generation and wind power can effectively solve the problem of power supply in remote areas,reduce the transmission pressure of the grid,and has a wide application prospect.Microgrid is a new type of power grid development model,which can be integrated with the scale of distributed power generation.It can help solve many problems in the current network,and has broad prospects for development.In the case of a variety of distributed power supply,how to ensure the security and stability of the microgrid is a very important research topic.In this paper,we study the operation control strategy and operation mode conversion strategy of microgrid.First of all,the definition and ch aracteristics of the microgrid and the characteristics of the development of microgrid in China are described.The access control mode and the control strategy of the microgrid are studied.Secondly,the function and basic principle of grid connected inver ter are studied.The principle and mathematical model of grid connected inverter are analyzed,and the control strategy of grid connected inverter is studied.The principle and application of several common control modes are analyzed.Finally,the basic ch aracteristics of three common structures are analyzed,and the control strategy is studied,and the operating mode switching strategy is studied.A simulation model is built in PSCAD/EMTDC simulation environment to validate the operation control strategy of microgrid.