Research On Operation Control Of Interconnected Energy Prosumers

The widespread of distributed renewable energy like rooftop photovoltaic leads to more and more terminal power users becoming proactive,who not only consume energy,but also produce energy,and this kind of power users are called energy prosumers.As the number of prosumers is getting more and more tremendous,multiple grid-connection ports will result in bad influences on utility grid.On the other hand,because renewable energy's power output of every prosumer is heavily subject to weather change,their power supply reliability is extremely poor.Hence,it is an inevitable trend to interconnect energy prosumers,in order to reduce impacts on distribution nework and improve the utilization of distributed renewable energy.It is high time to conduct extensive investigation on the operation control of interconnected energy prosumers.This paper studies the architecture of interconnected prosumers and energy router,which is the critical appliance to control power flow.The hierarchical operation control strategy of interconnected prosumers is proposed and simulations of several typical cases are conducted and analyzed.Main tasks of this paper are as follows.?1?The mathematical models of an energy prosumer and an energy router are established.Overall framework of one energy prosumer based on energy router with switch arrays is proposed.Three operation modes including island mode,grid-connected mode and parallel mode and transitions among these three operation modes are analyzed thoroughly.Control strategies of appliance level and router level are put forward.Fuzzy controller is used in the router level.Photovoltaic power output,state of charge and charge-discharge signal are taken as inputs of fuzzy controller,while the output is the system operation mode selection signal N,which will decide the state of various switches and help control power flows of the whole system.?2?The electrical topology of energy router based interconnected energy prosumers is designed,on the basis of previous work.Besides,Simulink model is established as well.Several working conditions of the interconnected prosumers are analyzed according to three significant switches.Proceeding to the next step,P-V droop control and U_dc/Q control for VSC in the interconnected prosumers system and upper level controller for the system are analyzed in detail.Typical cases'simulations of interconnected prosumers are done and analyzed based on the MATLAB/Simulink platform.The results show that energy router as the critical node of interconnected prosumers,can achieve the active control of power flow,and the proposed architecture of interconnected prosumers does help the entire system operate better.The proposed hierarchical control method controls power flow actively in accordance with given objections such as electricity purchasing cost,distance between sources and loads and power supply reliability,whose task is improving utilization of distributed renewable energy when the system operates effectively and stably.