Research On Energy Routers With Dual DC Bus Architecture

With the development of energy Internet,energy router has become the core device of the energy Internet.The energy router can not only realize the access and interconnection of the source load storage of plug and play,but also realize the choice and control of energy routing,so as to realize the rational allocation of energy and the safe,reliable and efficient operation of the energy Internet.In the different links of the energy Internet,we need to configure the corresponding function of the energy router,so it is necessary to study the high-performance energy router.The topology of energy router based on dual DC bus is proposed in this paper,which is to build LVDC bus and HVDC bus,and to access and interconnect photovoltaic,wind power,energy storage,AC network,AC and DC load on a variety of ports.The Boost circuit is used to control the output power of the photovoltaic and wind power ports.The energy storage port uses bidirectional Buck/Boost circuit to realize charge and discharge control.The AC power grid port uses the AC/DC converter to achieve the output stable DC voltage.The load port uses the DC/DC and DC/AC ports to achieve the output voltage stability.This paper analyzes the working mode and work characteristics of energy routers,establishes the control methods of each port and the coordinated control strategy of energy routers,and puts forward the active response index of the load side,in order to achieve the goal of bidirectional power flow control,port voltage stability operation and diversity selection of supply circuit diameter.In view of energy routing problem,this paper applies graph theory to study energy routing and energy routing table by studying the maximum flow problem and maximum flow minimum cost problem of energy network,and forms the energy routing method for energy routers.In the simulation study,three scenarios are set up to test and analyze.The results show that the energy routers studied can realize power allocation,system stable operation and port plug and play.For energy routing problem,three energy path scenarios are set up for simulation experiments,which verify the feasibility of the proposed routing algorithm.