Investment Decision Research Of Integrated Photovoltaic And Battery Energy Storage System Project For Rural Households

Affected by the turbulent international situation,global energy prices fluctuate greatly,and China’s energy security issues gradually become prominent.At the same time,with the proposal of the “carbon peaking and carbon neutrality” strategic goal,the pressure of carbon emission reduction increases,and it is extremely urgent to promote the transformation of China’s energy system.As a representative of clean energy,photovoltaic industry has been included in the national energy strategy.At present,China’s photovoltaic installation has ranked first in the world,but the deployment rate of distributed photovoltaic compared with developed countries in Europe and the United States,the gap is still large.With the implementation of the pilot project of “the whole county promotes photovoltaic power generation”,distributed photovoltaic has ushered in a new development opportunity in rural areas of China.However,a large number of distributed photovoltaic access to the power grid will have an impact on the smooth operation of the power grid,local policies have begun to require distributed photovoltaic configuration of energy storage system,in order to regulate the photovoltaic output.Under the new background of photovoltaic power generation with grid parity,what are the economic benefits and carbon emission reduction benefits of users’ investment in rural residential PV&battery cogeneration system? How should farmers make investment decisions? What are the main factors affecting the economic benefits of the project? All these issues need further study.Based on the life cycle theory,this paper builds the life cycle cost-benefit model and life cycle carbon emission benefit model of rural household PV&battery cogeneration system,and establishes the cost-sharing model of subsidy cost generated by incentive policies based on cooperative game theory.Through the analysis of the economic benefits and carbon emission reduction benefits of installing the hybrid system for households of different sizes in city B,it is found that the internal rate of return of the project is higher than the benchmark rate of return,the profitability of the project is excellent.However,the dynamic payback period is larger than the benchmark value and the project fund recovery ability is poor.The economic benefit of investing in smaller scale system is better than that of larger scale system.In addition,the results show that the project has significant carbon emission reduction benefits,and the larger the system scale,the better the carbon emission reduction benefits.Finally,this study conducted a scenario simulation for the three influencing factors of economic benefits of the project,and the results showed that reduce the initial investment cost,increase the total amount of solar radiation,and raise the feed-in price can significantly improve the economic benefits of the project.By increasing the feed-in tariff,the competitiveness of large-scale systems in terms of economic benefits can be effectively increased and users can be guided to install large-scale systems to pursue greater carbon emission reduction benefits.In this paper,shapley’s value method is used to apportion the policy subsidy cost caused by the increase of feed-in tariff.The result shows that 24.7% should be borne by the government,75.3% should be borne by the grid company.Based on the analysis results,this paper puts forward some decision-making suggestions for users to invest in rural household PV&battery cogeneration system,and also provides a reference for government management departments to promote the deployment of distributed photovoltaic in the future.