| The electrical&electric multiple units (EEMU) as a kind of innovation power mode can save energy effectively and reduce operating costs, which has a broad market prospect. The lithium-ion batteries as one of the EEMU power sources can provide the traction power which is necessary for the normal driving and recovery of the braking energy, which can realize saving energy and reducing consumption. It is a completely independent innovation for the EEMU power mode. This paper treats the power battery system of the EEMU as the main research object. According to the design requirements, the simulation model has been set up to simulate the real-time running state of power battery system under the working condition. Through compared with the experiment results, the simulation precision of the model has been verified. The specific research contents and the research results are as follows:(1)Through understanding the research background and significance of the EEMU, the concept of the EEMU had been clear. Through analyzing the working mode of the on-board power system and the key technology which the EEMU need to break through, the main research object of this paper was established. Through researching the domestic and overseas research status of lithium-ion battery group model and the application status of the battery system in the field of the rail transit, the method of this paper was established.(2)In accordance with the specific working mode of the power battery system, the corresponding power demand was calculated by using the Matlab software in the process of starting, uniform velocity and braking, through the analysis of the specific input conditions of the traction braking characteristics on the EEMU. The battery type was determined by comparing to several kinds of lithium-ion battery in terms of the voltage range, the charge and discharge rate, the environmental temperature, the battery energy density and the cycle life which may apply to power battery system. The configuration of the battery group was designed by combining with the power demand and the selected battery type. The specific design methods of the battery box structure was given according to the EEMU design requirements. It is the forward analysis work for building the simulation model.(3)The whole simulation model method of the power battery system was researched in detail, which included the DC/DC converter module and the power battery module. The control methods of the DC/DC converter and the solution of the battery series parallel in the Thevenin module was focuses on researching. The specific working mode of traction inverter was simulated by designing a power source module, which extracted the data of the EEMU running conditions. The regulated DC link was designed to stable the DC bus voltage. The closed loop was consisted of the power battery system simulation module. The model well realized the full simulation of the EEMU power battery system’s operating conditions on the working condition.(4)The parameter setting methods of each module in the power battery system simulation model was given. The method of the parameter number extension by using normal distribution rule was focused on researching. The analysis of the power battery system simulation result showed that the simulation results conformed to the design requirements and the power demand of the running conditions. The experimental results were given by completing the construction of the battery module experimental platform. By comparing the simulation results with the experimental results, the simulation model precision was verified. The simulation model laid the theoretical foundation of the EEMU experiment platform. |
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