Component-based Multi-mode Energy Management Of Distributed Energy Storage System

Because of that wind energy,solar energy has volatility,it will have a great impact on the power grid when connected with grid,thus that there is the need for energy storage system to achieve power supply balance.However,the distributed energy storage system presents multi-mode characteristics,due to the constant changes of the natural environment and the fluctuation of load demand at the user side.Therefore,this paper proposes a multi-mode modeling approach based component,studies the energy management solutions for distributed energy storage systems and analyzes the impact of energy storage systems on the economic performance of distributed energy systems.The main research contents are summarized as follows:(1)In order to analyze the impact of energy storage system on the economic performance of distributed energy systems,the output models of the distributed energy system for wind,solar,battery and electric vehicle(EV)are established firstly,and then the power generation cost of each power generation unit is analyzed to establish a distributed energy system operating cost function.(2)The multi-mode characteristics of energy storage system in wind-Photovoltaic(PV)-storage system are analyzed and the component-based mode-aware model of battery in different modalities is established.By considering the system operation cost,battery life loss cost and environment cost of purchasing power,an economic dispatch model is established.Taking the lowest integrated cost of power generation as the goal,considering the constraints of output force and safety performance,the particle swarm optimization(PSO)algorithm is used to generate the parameters of the energy management strategy for optimizing power scheduling.Under different weather conditions,the operation mode of battery scheduling cycle is analyzed,and the better effectiveness of the proposed strategy is verified by comparing the simulation results of the proposed strategy with those of the conventional strategy.(3)The multi-mode characteristics of energy storage system in wind-PV-EV system are analyzed and the component-based mode-aware model of EV in different modalities is established.In order to study the impact of EVs on the operation cost of distributed energy systems,a distributed energy system energy management strategy based on two-layer optimization is constructed in this paper.In the upper dispatch center,the economic dispatch model is set up with the goal of operation cost of distributed energy system,and the PSO algorithm is used to attain the power dispatch value and the dispatch plans of EV agents.In the lower EV agents,the EVs charge and discharge strategies according to different modes are developed to make the actual scheduling value and the upper scheduling plan consistent as much as possible.The proposed strategy can not only minimize the operation cost of distributed energy system,but also enable the EVs to achieve the expected state of charge values before departure through simulation results.