Modeling And Analysis On Electrical Braking Energy Of Urban Railway Vehicle

The energy conservation will be put forward higher requirement for the rapiddevelopment of urban rail traffic. Some braking energy will be absorbed and utilized againwhen urban rail transit train taking regenerative braking, which can reduce the waste of energyin tunnel. Also the research on the method and device of energy recovery has carried on. Inorder to provide a theoretical support and mathematical basis for braking energy recoverydevice of urban rail transit train This paper established an electrical braking energy model forurban rail train, which can analyze the proportion of regenerative braking accounting for thetotal electrical braking energy when the train taking electrical braking effectively.Firstly, the equation of the train operation was concluded by analyzing urban rail transittraction power supply system and researching the theory of train traction. After the research ofurban rail transit vehicle braking system and the conversion process between train runningstate and brake state, as well as according to the former train traction strategy and the actualtrain operation state at home and abroad, the traction strategy on modeling and simulation ofthis paper was determined at last. Secondly, the traction supply system of urban rail transitvehicles and the energy system of the train braking are modeled. Analyzed the energyconsumption of urban rail transit vehicles, establish the traction network topology model basedon a simplified model of the traction power supply system, get the admittance matrix andequations of the train with node method, list the specific solving flowchart of the DC tractionnetwork.Then, update the flowchart based on the conditions of the train occurred regenerativebraking and resistor braking. Thirdly, an example is analyzed on Shanghai Metro Line2.MATLAB simulation based on relevant parameters of vehicle configuration information, loaddata, running time of the train we measured and the actual line of Shanghai Metro Line2.Finally, we calculated the regenerative braking energy and resistive braking energy in each runinterval in detail, compared the results with the simulation data, and listed the causes of theerrors after a detailed analysis. The simulation results show that,200s within the interval departure, the regenerativebraking energy is71.8%of the total electrical braking energy between Song Hong RoadStation and Zhong Shan Park Station, the resistor braking energy is28.2%of the electricalbraking energy. Through the compared with the test data, the validity of the electrical brakingenergy model of urban can be proved. The model can provide research basis for the brakingresistance.