Scheme Design Of Battery Self-shifting Driven System For High-speed EMUs

At present,with the rapid development of China's socio-economic,the demand for transportation capacity in China is also increasing.With the continuous acceleration of the Chinese railway,the speed of 250 km per hour standard EMU has greatly improved the passenger capacity and freight capacity of China,and plays an important role in alleviating the "bottleneck" restriction of the national economy.The operation of high speed EMU trains in China mainly depends on the high voltage power supply of the catenary,however,when the high-speed EMU trains travels through the motor train section,the motor train station,and the overphase as well as stopping to the station,there is a possibility of stopping in the no electricity area,that the train can not rely on its own power to achieve self driving,and also seriously affect the operation efficiency.The traditional transfer technology generally has the disadvantages of high cost,low safety,be easy to cause environmental pollution and waste of personnel.Therefore,using the battery as the power source,to realize the short distance train running out of the electric power free zone,has a very good practical value.We found from the existing research results that there still lacking a complete set of battery self-shifting driven scheme for our country's 250 kilometre standard EMU trains.The purpose of this paper is to design a set of system scheme for the storage battery of high speed EMU by using the energy provided by the vehicle battery pack,the asynchronous motor is driven by the DC/DC converter and the traction inverter to simulate the running state of EMUs and make up for the blank of existing technology.This paper firstly compares and analyzes the performance characteristics of various power batteries that are widely used and are mature in technology,then combining with the selection and design principles of vehicular power source battery for high speed EMU,we choose lithium titanate battery as the power source battery for the battery self-shifting driven system.The modeling and simulation of the battery is carried out,and the discharge performance is tested by different rate current;Then,Considering that in the battery self-shifting driven system,the DC/DC conversion device needs to work at high power and high current.This paper designs a four interleaved Boost converter to analyse its working principle and build a complete simulation model;Then,using the minimum time division operation algorithm to complete the train traction calculation simulation of high speed EMU;then get shift operation energy consumption and running time of the EMU under the working condition of storage battery.And based on this making optimized configuration of battery capacity and module design.Considering the inconsistency of series battery group in the discharge process,designing a battery active balancing system to improve the overall performance of the batteries and service life;Then,this paper theoretically analyzes the vector control strategy for asynchronous motor based on rotor flux orientation to complete the design of motor drive system.Finally,using the Matlab/Simulink simulation platform to build the simulation model of the storage battery self-shifting driven system.The simulation model of the system is established by Matlab/Simulink,and the ground test platform is used to simulate the actual working condition of EMU to complete the experimental verification.The results of both simulation and experiment proved that the scheme of battery self-shifting driven system is feasible and correct.