Research On The Regenerative Braking Energy Recovery System Of Urban Rail Transit Train

Traditional Urban Rail Transit is commonly used resistors to absorb braking energy absorption. Train braking energy in addition to the use of outer part of the adjacent train absorption, The remaining part of the train braking resistor to the heat consumption. This recovery of energy absorption is not only a waste of energy, Also makes the temperature inside the tunnel, Increased requirements for air conditioning and ventilation systems, Resulting in further energy waste, Therefore does not meet the trend of development, Need to study braking energy recovery with the energy efficiency.The architecture of urban rail transit power supply system is first analyzed in Chapter II of this paper, in the existing four urban rail transit brake energy absorption (resistance to absorption, capacitive energy storage, flywheel energy storage, inverter feedback type), are all made a detailed study, discuss the advantages and disadvantages of these four brake energy absorption mode. Based on these three indicators of the economy, energy, technology maturity, Proposes a regenerative braking energy absorption based on the inverter feedback. Of the way the train’s braking energy back feedback to35KV medium voltage network through the inverter, for the use of other loads, achieve the purpose of saving energy.In Chapter III the main circuit design for inverter feedback brake energy recovery schemes is designed, Detail the principle of the circuit and the main components of the parameter selection. Control circuit uses a SPWM control strategy and PI regulator to achieve double-loop control of the voltage loop, the inner current loop.Finally, to verify the effectiveness of the system and the feasibility of control, the tool of MATLAB/SIMULINK is used to builded the simulation model of the inverter feedback type of energy absorbing device,and analysis the simulation results of voltage and current waveform harmonic content by FFT. Simulation results show that this control strategy to achieve the braking energy feedback, rapidly achieve the stability of the DC bus voltage. The voltages magnitude, voltages, currents harmonic content outputs to medium voltage network are in line with national standards.