Optimal Capacity Allocation Of Large Pv Power Station With Battery Energy Storage System And Its Economical Analysis

Photovoltaic power generation has many characteristics,such as the randomness and volatility.Due to the changes of the output power which are caused by the clusters of the large-scale centralized PV power station and its weak regulation of active power,a large number of the system reserve resources will be occupied and the stable economic operation of the power grid will be influenced.These are the main reasons resulting in the difficulties of large-scale new energy power generation system gridding and the poor economy of photovoltaic power plants.So,in this light,it is imperative for the Photovoltaic power station to be equipped with energy storage system which is an important technical means to improve the acceptance capacity of large scale centralized photovoltaic power generation system.However,the energy storage system is expensive,and it is significant for the healthy development of photovoltaic power generation and the new energy consumptive capacity of gird to study the economic feasibility of the Photovoltaic generation combined energy storage system.It is essential to solve the problem of the ratio of the PV&bettary storage capacity so that the economy feasibility of the Photovoltaic generation combined energy storage system can be analyzed.This paper consider the adaptability between the output of PV&bettary cogeneration and the scheduling plan and analyze the scheduling modes of the power station firstly.The optimization model of energy storage capacity is established with the goal of optimal net profit which remove the constant cost.In this model,electricity sales revenue,the actual operation loss cost of storage battery and the evaluation cost when the energy storage system output can not meet the demand of the plan tracking are quantitatively calculated as the indicators to calculate the actual grid gain.The validity of the model is verified by comparing the variety of the programs based on the measured data of photovoltaic power station,and so that it can provide reference information for the selection of the energy storage capacity.Then,based on the above simulation results and the whole life cycle theory,this paper considered the time value of money to model and calculate the economic indicators of PV station combined battery storage system.Next,the sensitivity of various factors affecting the economy of the power plant was analyzed and the boundary conditions of the economic feasibility about the PV&bettary cogeneration system was put forward,and the large-scale centralized power station could get reference from the economic feasibility.Finally,based on the above research,the economic analysis software of the PV&bettary cogeneration system was compiled to analyze the investment and cost information of the power plant in its construction and operation period.And according to the relevant sensitivity factors such as: the unit cost of photovoltaic panels,the on-grid electricity price and so on to collect the reports and analyze the graphics of economic indicators.And the PV power station combined battery storage system could do forecast analysis of the economic operation,the future trend and the profit and loss balance based on the above analysis.And these conclusions could provide data support for the construction and operation of the power station.