| Under the background of development of new energy,opening of power market and improvement of energy Internet industry,energy storage system will become an important and key technology to support China’s energy development strategy.Energy storage system is one of the effective ways to solve the problem of grid connection of new energy generation.It is also an important part of energy Internet and an important means to improve the flexibility,economy and security of traditional power system.In this context,this paper mainly studies the technical applicability and operational benefits of electrochemical energy storage system in typical application scenarios of power system.The paper includes four parts:firstly,the typical application scenarios of energy storage in power system is summarized and the cost and benefit model of energy storage system is established.secondly,an applicability evaluation model of energy storage technology in typical application scenarios is modelled;thirdly,the benefits of energy storage system in typical application scenarios is evaluated;Lastly,the potential revenue of energy storage in future policy scenarios and some developing guarantee mechanism are put forward.Firstly,the typical application scenarios of energy storage in power system are studied.Based on the technical characteristics of energy storage and its installation position in the power system,this paper analyzes the typical application scenarios of energy storage system from the three major fields which are user side,grid side and generation side,and lists the energy storage demonstration projects of each application scenario.Secondly,the cost and benefit composition of energy storage system in typical application scenarios are analyzed.First,from the whole life cycle of energy storage system,the cost of energy storage system is detailes to two parts of initial investment cost and operation and maintenance cost according to the hardware composition,and the quantitative modeling is carried out.Second,based on the research results of energy storage system application scenario in the previous chapter,the revenue sources of energy storage system in all application scenarios of user side,grid side and generation side are analyzed respectively and the income calculation model stablished by direct calculation or indirect substitution.Thirdly,the comprehensive applicability of different energy storage technologies in different scenarios is evaluated.First,a comprehensive evaluation index system covering technology,cost and benefit indexes is established.second,a sizing model and an applicability evaluation model of energy storage technology based on improved entropy weight fuzzy comprehensive evaluation method are established;finally,the comprehensive applicability of different energy storage technologies in each scenario is evaluated from the user side,grid side and generation side respectively.Fourthly,the operation efficiency of the energy storage system is evaluated in three typical application scenarios.First,based on the results of quantitative analysis of cost and income in Chapter 3,the benefit evaluation model is established.Second,with the selection of the most applicable energy storage type in each application scenario,the benefit evaluation of energy storage project is carried out,and the sensitivity analysis of key cost and income is calculated to find the key factors affecting the profitability of energy storage in different scenarios.Finally,the paper studies the potential benefits of energy storage and the development guarantee mechanism of energy storage industry under the future policy scenario.First,based on the development trend of the power market,the potential benefits of the future energy storage are studied from four perspectives of the spot market,the auxiliary service market,the carbon trading market and the real-time electricity price environment,and preliminary modelings are raised.second,some development guarantee of the energy storage industry is put forward From the macro level,micro level and social level.The results show that the lead-acid battery technology has the strongest applicability in the user side scenario,project’s dynamic investment payback period of the is about 16.69 years and the internal benchmark rate of return is 11.85%.The energy storage system has the strongest sensitivity to the peak valley price difference.In the grid side scenario,the lithium-ion battery technology has the strongest applicability whose investment payback period is 16.5 years and internal rate of return is 10%,and it is most sensitive to the battery cost.In the generation side scenario,The lithium-ion battery has the most advantages whose payback period is about 18.9 years and internal rate of return is 11%.The energy storage system is most sensitive to the cost of battery purchase. |
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