Research On Operational Strategy And Economical Efficiency Of Source-Grid-Load-Storage System Based On Industrial Park Incremental Distribution Grid

China's energy demand is rapidly increasing,with the fast development of the world economy.Distributed photovoltaic power generation,energy storage and incremental distribution grid are the development direction of energy structure transformation supported by the state.It attracts the research and exploration of experts and scholars at home and abroad,and has broad application prospects.Distributed photovoltaic power generation is coordinated with power load distribution and power grid planning according to the principle of economic optimization.Depending on the market-oriented transaction of distributed generation,the optimal allocation of power resources can be realized in the incremental distribution grid area.Optimized operation mode and technology of source-grid-load-storage system refers to the operation mode and technology of power supply,power grid,load and energy storage to improve power dynamic balance capability of power system more economically,efficiently and safely through various interactive means,so as to maximize the utilization of energy resources.This mode is the operation mode that includes the overall solution of power supply,power grid,load and energy storage.This paper studies the service content of incremental distribution network and the method to determine the distribution price,and analyses the investment income under different voltage levels through practical cases.This paper analyses the project scale of distributed market-oriented transaction and three transaction modes,and puts forward the optimal mode according to the balance of risk and income.The demand scenarios of energy storage station under three modes of generation side,transmission and distribution side and power side are analyzed,and the scenario requirements of distributed energy storage station in incremental distribution grid are proposed.From the perspective of income,risk balance and revenue correlation,this paper analyses the operation mode of rationally balancing various stakeholders in the source-grid-load-storage system of industrial park.The dynamic economic evaluation index is used to evaluate the economy of the source-grid-load-storage system.The extraction methods of typical curves of photovoltaic power generation and power load are analyzed.A benchmark for trading electricity price based on distributed generation market method is proposed.Cost expenditure and revenue models of distributed photovoltaic,energy storage and incremental distribution grid are established.The investment economy of distributed photovoltaic power generation projects in Industrial Park incremental distribution network and the income of incremental distribution network enterprises and power users are analyzed through practical cases.Based on the life cycle model of energy-type lithium iron phosphate battery,the method of depreciation of fixed assets of energy-type lithium iron phosphate battery is analyzed by workload generation,and the depreciation of electricity caused by accumulative transfer energy of energy-type lithium iron phosphate battery is proposed.The current peak-valley tariff policy in Guangdong Province is analyzed.The operation modes of single cycle charge-discharge and multiple cycle charge-discharge per day are put forward.The cycle charge-discharge times and operation life of energy storage battery under different operation modes and DOD of discharge depth are analyzed.Through fmincon function,the battery capacity and maximum charge-discharge power of distributed energy storage station are optimized.