| With the rapid development of distributed energy(DR),especially the increase in user-side photovoltaic installed capacity,local energy production has increased.Due to the intermittent nature of photovoltaic power generation and changes in consumption patterns,the mismatch between supply and demand will further intensify in the future.Energy storage is considered to be the key to solving this mismatch.Compared with residential energy storage,community energy storage has more advantages in terms of economies of scale,energy trading,and ancillary service capabilities.As an investor,the community invests in energy storage projects,aiming to reduce the cost of community users participating in energy sharing,while improving energy efficiency,and realizing benefits through external energy transactions.At this time,the community that invests in energy storage has an obvious corporate nature.However,due to the unclear domestic subsidy policy and high initial cost,the implementation of community energy storage projects in the country is still not economical.Therefore,this article attempts to discuss the investment decision-making problem of community energy storage projects under government subsidies,and incorporates the peer-to-peer(P2P)transaction model into the income model,in order to provide decision-making suggestions for the investment and promotion of community energy storage projects under different subsidy models.The thesis first introduced the conceptual features of community energy storage projects,community energy storage power trading models,and community energy storage investment decision-making theory.On this basis,it is defined that the community energy storage income in this article is shared by the community and is not a third-party investment;external power transactions adopt the P2 P model;investment decision-making adopts a cost-benefit analysis method based on the whole life cycle.Then the user-side energy storage subsidy policy was sorted out,and two main subsidy models(cost subsidy and electricity price subsidy)were determined.It also conducts literature metrology to identify research trends and main concerns of community energy storage investment,and on this basis,combined with literature review to determine the main influencing factors of community investment in energy storage(technical progress,energy storage capacity,P2 P electricity price and community electricity demand),And analyze the investment characteristics of community energy storage projects.Construct a life-cycle investment decision model based on government subsidies and other influencing factors.Taking into account the characteristics of high investment cost and short project life cycle,the economic evaluation indicators and technical evaluation indicators for investment decision-making are set separately.Finally,according to the community’s photovoltaic and electricity load to meet self-consumption as a benchmark,select the installed capacity of the community’s energy storage and set the parameters.Then calculate the net present value,internal rate of return,investment payback period and levelized energy storage cost of the community energy storage project under the three modes of non-subsidy mode,cost subsidy and electricity price subsidy,and constrained by the photovoltaic self-sufficiency rate and self-consumption rate.The results show that under the non-subsidy model,community energy storage projects are not economically viable.In the cost subsidy mode,the initial installation subsidy of 60% can achieve NPV>0;in the electricity price subsidy mode,the electricity price subsidy of 0.6 yuan/kw·h can achieve NPV>0.Considering other economic indicators,a higher initial installation subsidy ratio or electricity price subsidy amount is needed to be attractive for investment.In addition,investing in larger installed capacity can reduce the need for subsidies.Finally,based on the analysis results,decision-making suggestions are given and a summary outlook is given. |
PDF Full Text Request