| In recent years,with the improvement of technology performance of energy storage system,reduction of cost,the prominent contradiction between power supply and demand,and the introduction of incentive policies,the economics of the battery energy storage technology featured long-life,low-cost,high-energy conversion efficiency are gradually highlighted.The application of energy storage technology has gradually shifted from demonstration to commercial operation.However,at present,the technical and economic performance of energy storage system is limited,and the economy of scale is not yet available.The capacity configuration and economic evaluation of energy storage system are prerequisites for the application of energy storage demonstration projects and commercial projects.This paper has studied this issue.The main research contents include:(1)The thesis analyzes and researches the basic issues of energy storage capacity configuration and economic evaluation,including the structure,model of state of health,current technology and economy status of typical battery energy storage technology with large scale applications in power system,extraction method of typical curve.On the problem of capacity attenuation of energy storage,based on depth of discharge and number of cycles,the evaluation method for the state of health of batteries is proposed.The typical power curve extraction methods of output for renewable power and typical load curve are proposed.(2)In order to achieve the overall economy of source,storage and load system,a bi-level planning model for collaborative collocation of source,storage and load in multiple time scales is established.The upper layer optimization takes coordination ratio of source,storage and load as the decision variable and the investment return rate as the objective function.The lower layer optimization takes the charge and discharge power of energy storage as the decision variable and net income as the objective function.The state of health and capacity attenuation characteristics of energy storage system are taken into account.The reasonable suggestions are put forward for source-storage-load capacity ratio in the early planning and the continuous discharge time of the energy storage System.The simulation results show that the method can achieve the best overall economy of the source,storage and load system,and the ratio among the source,storage and the load,and the continuous discharge time of the energy storage system are in agreement with the actual situation.(3)A multi-objective optimization configuration method for energy storage systems is proposed for the problem of energy storage configuration under unilateral investment and multiparty benefits.Based on the background of enhancing the absorption of wind power by energy storage system cooperative regenerative electric boiler,the wind curtailment characteristics of wind farms in Northeast China are analyzed,and the mechanism of reducing wind curtailment by energy storage system cooperative regenerative electric boiler is proposed.Multi-objective configuration mathematical model of energy storage system for eliminating wind curtailment,system cost and energy utilization efficiency is established.The simulation results show that energy storage system cooperative regenerative electric boiler possesses comprehensive economics for reducing wind curtailment,and makes up for the fact that the separate configuration of energy storage system and regenerative electric boiler cannot decouple heat and electricity contradiction during the winter heating period,and cannot absorb wind curtailment during the non-heating period.(4)In order to solve the planning problem of energy storage system under multiple technical and economic indicators during the commercialization stage,based on the Analytic Hierarchy Process(AHP),a technology and economic multi-attribute planning method of energy storage system was proposed.Taking into account the operating conditions and capacity attenuation characteristics of energy storage system,a comprehensive evaluation model is established with the life of energy storage system,investment cost,payback period,return on investment,net present value as the upper level optimization,and net annual income as the lower level optimization.The simulation results show that there is a significant difference of storage capacity between the maximum of net income and return on investment.The proposed method can put forward the appropriate storage capacity based on the actual conditions of different investors.(5)For the problem of life cycle economic evaluation of energy storage system,the feasibility and cost of second-use batteries for energy storage station are analyzed.The economic analysis method of conventional battery energy storage system based on value perspective and retired vehicle power battery energy storage system based on competitiveness perspective,and evaluation indicators are proposed respectively.From value perspective,the economy of different types of energy storage systems are evaluated respectively,as well as the effect of policy incentive operated is analyzed.From competitiveness perspective,the competitiveness assessing method of retired vehicle power battery compared with conventional battery energy storage systems with the same incomes is proposed,which can avoid the impact of expected cash flow assessment error in traditional discounted cash flow analysis on economical evaluation. |
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