Research And Application On Contrl Strategy In Micro-Grid Connection

Distributed generation has a wide range of economic and social benefits,however,the cost will be higher and the control will have the certain difficulty by the means of single access as well as effecting the wider use of distributed power generation technology.Combining with distributed generation,load,energy storage and control device in a system,microgrid forms a small power distribution unit which is united autonomous and easy to control.That can promote the rapid development of the distributed power generation technology.Therefore,analyzing the control method of distributed generation in detail and studying the control strategy of microgrid which can operating stably under different operating modes in depth have the important social and economic significance and research value.The main contents in this paper are as follows:(1)The droop control,V/f control,PQ control are described and compared.The advantages,disadvantages and application conditions of the microgrid master-slave control mode,peer-to-peer control mode,and hierarchical control are demonstrated.(2)On the basis of the research on the whole operation control mode of microgrid,the structure of peer-to-peer control based on droop control is built.Verify the effectiveness of the control mode through the operation results of the microgrid in grid-connected operation,island operation,switching mode,load switching and so on.(3)According to the engineering practice,the functional requirements of the intelligent building solar photovoltaic power generation system are introduced.According to the solar photovoltaic power generation system of Schneider Wuhan headquarters,the project overview,technical scheme design basis and the design of the specific program are carried out.