Research On Operation Control And Energy Management Of Smart Microgrid

With the rapid development of social economy,the demand for electricity in industrial production and residential life is increasing.The large-scale power system with centralized power generation and long distance high voltage transmission,with the expansion of the power grid,its disadvantages are becoming increasingly prominent,high cost and difficult to run,so it is difficult to meet the increasing reliability and diversified demand of the users.At the same time,the traditional energy crisis and the problem of environmental pollution have become the focus of the world’s attention.It is urgent to develop clean energy vigorously.Smart microgrid can make full use of new energy and make up for the shortcomings of large power grid,so it has become a research hotspot in recent years.In this paper,we focus on the operation control and energy management of smart microgrid system for wind /pv/battery.The specific research contents are as follows:(1)The characteristics of three kinds of distributed generation of wind power,photovoltaic and energy storage are analyzed,and the mathematical models of each unit are established.(2)The smart microgrid operation control strategy is studied in depth,including distributed generation control,microgrid coordination control and microgrid black start control.We put forward a control strategy which combining master-slave control with hierarchical control.When the master controller is connected to the grid,the PQ control strategy is adopted,and the VF control strategy is used when it is disconnected to the grid.It realizes the smart microgrid not only to connect to the grid,but also to operate on the island,seamless mode switching and flexible operation in various ways.(3)The 6kW smart microgrid system for wind /pv/battery experimental platform is designed.And based on battery SOC,we have developed an smart energy management system software for wind /pv/battery smart microgrid.Which realizes the functions of smart microgrid measurement and control,protection,mode switching,power control,load control and energy storage management.Under the five operation models of the direct supply mode,the energy feedback mode,the battery power supply mode,the external power supply mode and the load limiting mode,We have carried out the operation test on6 kW wind /pv/battery smart microgrid experimental platform.Through testing,we have obtained multiple of operation curves and power quality data.Which further verified thevalidity and stability of the operation control strategy and the energy management system adopted in this paper.