Research On Prototype Model And Energy Management Strategy Of On-board Photovoltaic Energy Storage System

The rapid development of railway is accompanied by the astonishing energy consumption,and the traction energy consumption accounts for more than 70% of the total energy consumption of railway.In recent years,in order to reduce traction energy,the railway sector has issued a number of policies to promote the application of renewable energy in traction systems,and solar energy has perfectly matched the application requirements of the railway sector with its advantages such as wide distribution,no noise,and no pollution.Considering the characteristics of the large number and the wide available space of trains in our country,this paper studies the application of photovoltaic in vehicles in the following aspects:The application status of railway energy-saving technologies in China,the solar energy resource reserves and the development status of photovoltaic industry are introduced.For the practical application of the train,the component selection of the train’s on-board photovoltaic generation system is proposed,and the installation plan and access plan are formulated,and the energy dissipation strategy under each access plan is given.Set up a prototype of on-board photovoltaic power generation system reference to the actual train installation and access scheme,and set up the data acquisition system and control system to provide an experimental platform for verification the power generation forecast and energy management algorithm of the photovoltaic power generation system described later.The principle and output characteristics of the photovoltaic generation system are introduced.According to the particularity of installation and application,the photovoltaic generation system’s power prediction model is modified and the system’s power generation capacity during the life cycle is calculated.The above calculation method is applied to a photovoltaic prototype vehicle and compared with the actual situation,and the result analysis is finally given.Aiming at the 24 V bus access scheme of the vehicle-mounted photovoltaic power generation system,the optimal energy storage installation capacity is calculated based on the energy storage charge and discharge power limit,the SOC,the energy dissipation rate of the photovoltaic power generation system,and the loss of load rate to verify the matchability of onboard energy storage power generation system.The addition of the photovoltaic generation system has changed the original power supply structure of the vehicle,and its energy management algorithm needs to be reformulated.Aiming at the characteristics of rapid changes of the irradiance conditions and various shadow occlusions,this paper proposes a global maximum power tracking(GMPPT)control strategy suitable for on-board photovoltaic generation systems,and Comparison of simulation and experimental verification with conventional algorithms to verify the control performance.For the on-board photovoltaic power generation system,an economic model considering the costs,benefits,net present value method,and system efficiency is established.The economic benefits of the vehicle-mounted photovoltaic power generation system after practical application are calculated,and the effects of various parameters on economic returns are analyzed.The results have certain reference significance for the actual promotion of this subject.