Research On Capacity Allocation Of PV-storage Power Station Based On The Whole Life Cycle Theory

Photovoltaic power generation has been given great attention because of its cleanliness and sustainability under the background of the current society with prominent energy and environmental problems.However,photovoltaic power generation is random,thus the stable operation of the system will be affected by the increase of permeability.Therefore the power grid needs to provide greater reserve capacity or to limit the output of PV,virtually reducing the revenue of the power grid and power plant.Energy storage battery has the characteristics of dynamic absorption of electricity and timely release,thus centrally disposing the battery energy storage system on the photovoltaic power station will effectively improve its planned tracking capability,reduce the abandonment of light and enhance the grid’s acceptance of photovoltaic power generation.It can be seen that the connection of photovoltaic generation and energy storage provides a new solution for centralized grid connection of large-capacity photovoltaic,which provides the future direction of development.In the joint operation of photovoltaic generation and energy storage,first the ratio problem of power storage capacity needs to be solved,and the purposes of its configuration and the achieved results are required to be determined.The current battery energy storage system is expensive;hence studying the feasibility of large-scale energy storage configuration from the economic level has great significance for the regular development of centralized photovoltaic power generation and the absorptive promotion of the grid new energy.First of all,in this paper,the access scheme and topological structure of the PV-storage power station are compared,analyzed and selected from various aspects.And the centralized configuration of energy storage is determined as the coupling mode of the connected power generation system of photovoltaic generation and energy storage.Then the reliability of key equipment of power plant is modeled based on MCMC method,and the dimension disaster caused by the excessive number of equipment is solved through risk equivalence.The Gibbs sampler is used to sample and simulate the failure conditions of the key equipment,and the number of failures and the corresponding breakdown costs of the key components in a certain period of time are obtained.Finally,an optimal model of maximum net present value energy storage capacity is constructed considering the time value of funds based on the life-cycle theory,in which the actual operating loss costs of storage batteries is quantitatively calculated in the model.When the connection of photovoltaic generation and energy storage can’t meet the assessment costs;failure costs and other costs in the planned tracking needs and it is taken into account the revenue of grid-connected electricity sales,the energy storage allocation capacity and corresponding economic indicators is calculated in condition of the largest net present value of PV-storage power station.In order to verify the effectiveness of the model,a variety of schemes are set up.The simulation results show that the model built in this paper can effectively advance the economy of the PV-storage power station,improve the power quality at the same time,and provide a reference basis for the configuration of energy storage capacity of the present large-scale centralized PV-storage power station.