Research On Application Value Of Energy Storage Systems In The Power Grid And Its Commercial Modes

The gradual increase of photovoltaic penetration has brought many challenges to the stability of renewable energy connected to the grid.Energy storage technology has been widely used because it can smooth the fluctuations of the photovoltaic and enhance the controllability of the photovoltaic.This paper studies the application value and business model of the energy storage in the power grid.The main research contents are as follows:1)Study on the energy storage planning method of photovoltaic combined energy storage stations on power generation side for assuming the abandoned photovoltaic,taking the maximum annual value of the net income in the whole life cycle and the minimum amount of abandoned photovoltaic as objective functions,a model of the minimum amount of abandoned photovoltaic of the photovoltaic connected to the grid and the net income of the photovoltaic combined energy storage power station is established,which is solved by a multi-objective optimization genetic algorithm.When the amount of the abandoned photovoltaic is zero,the capacity and depth of discharge value of the energy storage system under different combinations of three energy storage batteries are given by nonlinear programming method.2)Study on the energy storage method of assuming the abandoned photovoltaic on the distribution side of photovoltaic combined energy storage charging station,and the daily operation strategy of the photovoltaic combined energy storage charging station under the condition of the known photovoltaic installed capacity is given,taking the net income of the photovoltaic combined energy storage charging station during the whole life cycle as objective functions,and the planning model of the photovoltaic combined energy storage charging station based on game theory is established.the optimal energy storage scheme and capacity configuration of the photovoltaic combined energy storage charging station are obtained.3)Study on the energy storage planning method for the micro-grid to assume the abandoned photovoltaic on the user side containing the photovoltaic and energy storage system,based on the time-sharing electricity price,the maximum annual value of the net life of the micro-grid system,and the optimal configuration model of the energy storage capacity of the micro-grid system is obtained by the game theory,and the optimal energy storage scheme,capacity configuration and suitable for the micro-grid system are obtained.4)Study on the economic evaluation method of energy storage power stations in the above three scenarios,based on the four indicators of recycling age,levelized cost of energy,financial net present value and energy loss rate,combined with the energy storage capacity configured in the above three scenarios and depth of discharge value,a comprehensive evaluation model of the photovoltaic combined storage system based on entropy weight method and analytic hierarchy process is established.The weight of each index is determined by entropy weight method,and the overall ranking of different types of energy storage combination schemes is obtained by using analytic hierarchy process.Finally,the three types of energy storage combination schemes can be the best overall economics of the photovoltaic combined storage system.5)Research on the energy storage business mode in the above three scenarios,and study the business models of three scenarios under the three financing modes of user self-investment,third-party financing and joint venture.Calculates and analyses the models,then obtains the net cash flow and recovery cycle of three scenarios under different financing modes,finally compares the applicability of the three financing modes under different scenarios.