Research On Unit Structure And Performance Of Soft Carbon Battery Energy Storage Power Station In Qingdao

At present,there is a worldwide energy crisis,the shortage of primary energy reserves can not meet people’s daily needs;The burning of fossil fuels pollutes the air with toxic pollutants,which seriously affects people’s lives;The state vigorously advocates energy conservation and emission reduction,and takes the road of sustainable development.In this new situation,the active development and utilization of new energy has become the focus of attention of all sectors of society.Among many new energy sources,solar energy is abundant,clean and pollution-free,and it is a very reliable new energy source.At present,the utilization of solar energy is mostly based on photovoltaic effect,which connects and matches photovoltaic modules to form photovoltaic power stations to supply power for load.However,solar energy has low energy density,is vulnerable to weather,and more importantly,it does not have energy storage function.Therefore,in the utilization of solar energy,the development of energy storage technology is very important,which leads to the development and construction of energy storage power stations.On this basis,Qingdao Energy Storage Power Station Unit is designed and put into research.Qingdao Soft Carbon Storage Power Station Unit is based on the special geographical location of Qingdao and closely related to the national policy.Qingdao has a suitable climate and abundant sunshine days throughout the year,so it has unique advantages in development and utilization.In order to meet the functional requirements of Qingdao photovoltaic energy storage power station,a set of data parameters matching is carried out,including the selection and matching of photovoltaic modules,the design of photovoltaic support(inclination angle,azimuth angle and installation distance),the power selection of inverters,the capacity design of battery packs and so on.The photovoltaic module with rated power of 250 W is selected for design matching in two parallel and two series modes;Secondly,the finite element analysis is carried out to analyze the strength and fatigue life of the bracket,and the maximum stress of the bracket is 135.99 MPa.The maximum stress of the photovoltaic laminate is 57.3 MPa,which meets the design strength requirements of the photovoltaic power plant unit;Thirdly,the key circuits such as inverters are simulated and designed,and the maximum power point tracking method is used to improve the utilization of solar energy.The parameters and performance of the unit are debugged to meet the design requirements;In energy storage battery,a new structural material,soft carbon,is proposed.On this basis,a full battery is designed and manufactured to be equipped in the energy storage power plant unit.At the same time,its advantages in energy storage compared with traditional lithium iron phosphate batteries are verified.The results show that although the capacitance of high-rate discharge decreases,it can still meet the design requirements of the experiment(the discharge capacity of 2C decreases,but still exceeds 90% of the discharge capacity of 0.5C).The rate performance is excellent;when the temperature is 25℃ and 55℃,the discharge rate is 100%.When the temperature further decreases,the discharge rate decreases,the lower the temperature,the more obvious the decrease,but the overall decline is not large.At-20℃,the discharge rate can still reach more than 80%,and the low temperature performance is better.Finally,the photovoltaic power plant unit is developed and verified by experiments.Compared with the previous simulation results,the charging efficiency of the power plant can reach 88% when the external load(electric vehicle)is supplied.The power plant unit has excellent charging and discharging efficiency to meet the construction requirements of the power plant unit,ignoring the influence of its own losses and external environment.