| As a key period of carbon peak and carbon neutrality,during the 14th Five-Year Plan period,the power grid promoted the construction of low-carbon energy system and accelerated the formation of a new power system with collaborative operation of"source-net-charge-storage".Electrochemical energy storage is an essential technical support in the new electric power system.It has become a key problem to be solved urgently,on the basis of ensuring good regulation utility,how to realize the economical and rational distribution of energy storage in all parts of the electric power system,drive the investment enthusiasm of all sides,grid side and user side,and dig the diversified business model suitable for our country.Therefore,based on two perspectives of macro-economic benefits of the whole society and individual micro-benefits,this paper quantifies the capacity allocation and price strategy of the three-side energy storage projects under the charge of the source network,scientifically evaluates the economy of energy storage projects,and analyzes more potential possibilities for energy storage to participate in the electricity market transaction.The main research work of this paper is as follows:Firstly,the typical application scenarios and business models of energy storage in the source side,grid side and household side of the power system are studied and sorted out.Based on the technical demand for energy storage in each link of the power system,the relationship between the application effect and potential benefits of energy storage on each side is analyzed,and the existing domestic and foreign energy storage support policies and subsidies are introduced to provide theoretical support for subsequent research work.Secondly,considering the utility of each side of large-scale new energy and energy storage,a macroeconomic matching model of energy storage on three sides of source,grid and load is constructed to maximize the social benefit.It focuses on quantifying the benefit indicators of energy saving and carbon saving of energy storage at the source side,indirect benefit of the service system at the network side,household participation in the market and subsidy for peak cutting and valley filling.The modeling is completed based on the whole life cycle cost theory and the time value of funds.Finally,the NSGA-Ⅱ algorithm is used for the calculation of the improved IEEE30-node system to verify the rationality of the model.It provides a reference for the economical balanced distribution and application of energy storage in electric power system.Thirdly,based on the energy storage distribution model of social benefits,a three-party game model is constructed based on power producers,power companies and users,and the investment modes of different energy storage investors are considered to study the income and price strategies of each side of energy storage investors.Game participants,game strategies,game objectives and equilibrium solution theory are introduced,and a dynamic closed-loop game framework is built to maximize the profit of each side’s energy storage configuration.The iterative search algorithm is introduced to solve the game model.Fourthly,combined with the conclusions of the two models introduced in Point two and point three,the actual situation of a region in Guangdong is taken as a practical case to analyze the numerical example.This paper mainly compares the changes of energy storage price strategy under the two modes.The results show that the proposed model can effectively optimize the strategic behavior of market players,promote the economic equilibrium of multilateral transactions in the electricity market,and provide new ideas for the investment decision of energy storage in new power systems. |
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