Research On Economic Evaluation Of Second-use Battery Energy Storage System In The Scene Of Peak Load Shaving

The shortage of fossil energy and the deterioration of environmental problems have promoted the development of the electric vehicle industry.As the sales volume of electric vehicles in China continues to rise,large quantities of power batteries are eliminated from electric vehicles,how to deal with retired power batteries has become an important social issue.After the electric vehicle power battery is retired,its actual capacity can reach 80%of the initial capacity.After screening and reorganization,it can continue to play a role in the field of energy storage.However,the technical and economic performance of the cascade utilization of power batteries is limited at the present stage,and economies of scale are not yet available.Whether decommissioned batteries are economically used for energy storage determines whether the industry can successfully transition to largescale commercial applications.The economic evaluation of echelon utilization of power batteries has very important theoretical and engineering values.From the perspective of users,this paper builds energy storage based on retired lithium iron phosphate batteries,studies the economics of energy storage applied to the user side in the peak-shaving and valley-filling scenario,and carried out the following research.First,it introduces the current development status of the electric vehicle industry and the decommissioning of power batteries,and analyzes the necessity and economic value of cascading use of retired power batteries.It also summarizes the research status of domestic and foreign decommissioned battery demonstration projects and the use of decommissioned battery echelon utilization,and gives the operation mode of the userside echelon battery energy storage system.Secondly,the life cycle cost of the cascade battery energy storage system is studied,the cost analysis is based on the improved levelized cost model,and the levelized cost of the cascade battery energy storage system is calculated based on specific cases,and the level of the new battery energy storage system is calculated.A comparative analysis of standardization costs was carried out to initially verify the cost superiority and economic feasibility of the cascade battery energy storage system.Next,the benefits of the cascade battery energy storage system for the user side in the peak-shaving and valley-filling scenario are studied.The net present value method,the internal rate of return method,and the dynamic payback period method are used to evaluate the economics of the project and calculate the demonstration project Net present value,internal rate of return,and dynamic investment payback period,and give economic criteria.And through sensitivity analysis and economic parameter boundary analysis,specific suggestions are given to improve the economics of the cascade battery energy storage system.Finally,based on the principle of interval mathematics,an interval economic evaluation method suitable for cascade battery energy storage systems is proposed.In specific demonstration projects,considering the fluctuations in battery cost,changes in the peak-to-valley price difference caused by changes in the electricity price policy,fluctuations in interest rates,and project cycle changes,etc.,an interval economic evaluation of the battery energy storage system for cascade use is carried out,and various The risk value of the project under the circumstances.