| The subway is the first choice to solve the traffic problem in big cities, which has many advantages, such as large carrying capacity, fast speed, high efficiency, saving soil and so on.The traditional metro vehicle uses the braking resistance to regenerate the braking energy. Not only does it cause waste of energy, but also a large amount of heat is dispersed into the air,increasing the ambient temperature. In recent years, Vehicle braking resistor is cancelled, and the use of capacitive storage on the ground or inverter feedback device has been used in renewable energy recycling program in practice. In this paper, two aspects of research work are carried out on the basis of the energy saving and emission reduction of electric traction system of Lanzhou rail transit line 1. The one is study on the coordination of ground energy feedback device and on vehicle absorption unit. The other one is study on the comprehensive economic benefit of the ground inverter. The main contents are as follows:The simulation model of locomotive starting and braking process was built. Establishing the mathematical model of 24 pulse rectifier and traction drive for power supply system,Traction drive system adopted vector control. Traction drive system combinedspeed closed-loop and closed-loop flux and rotor flux subsystems. A simulation model was established in Matlab/Simulink. Then the paper analyzed the changes of the voltage of the traction network under different working conditions.An energy absorbing scheme based on the combination of inverter feedback absorption and overvoltage absorption was built. In this part, the design of the main electrical parameters and control of the feed forward converter is presented. LC filter was used to filter and the inverter feedback type used double loop PI control of inverter feedback based on grid voltage feedforward. The test results of Chengdu rail transit line ten verified the good performance of the design. Then, the absorption resistance parameters and control algorithm were discussed.The PI control was adopted in the absorption unit, and the overvoltage absorption resistance was set according to the air brake delay time. Finally, the simulation model of the whole simulation system including power supply system, vehicle and regenerative braking energy feedback is established and the cooperation between the inverter and the overvoltage absorption unit is analyzed. At the same time, this paper discussed the influence of train braking power factor and line impedance factor on the cooperation between the twoEnergy saving simulation analysis of energy supply system. The simulation model,including traction power supply system, line, vehicle load and ground energy fed converter system, was built based on the specific situation of Lanzhou rail transit line 1. According to the simulation results, the regenerative braking energy and its variation characteristics were analyzed under the intluence of the ramp and curve, providing the basis for the next step of comprehensive economic analysis.Comprehensive economic benefit analysis. The paper analyzed on the comprehensive economic benefit of ground absorption equipment for Lanzhou Rail Transit Line I from some aspects, such as: the back coupling energy by regenerative converter, the braking resistance ventilation power, the reduction of the power consumption of the vehicle weight and vehicle traction cost. At the same time, the energy absorption device can be used to realize the reactive power compensation at night. Analysis results showed that this method can effectively feedback the braking energy, reduce the traction power consumption and brake resistance ventilation power, reduce the cost of the vehicle and the cost of reactive power compensation device. |
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