Research On The Simulation Of Energy Absorbing Device Based On Inverting Regenerative Braking Of Metro

The energy generated by subway train regenerative braking goes back to DC catenary, part of it was absorbed by the adjacent trains, another was absorbed by the vehicle braking resistor consumption, the part of the energy which not absorbed and consumed will lead to the DC catenary pressure. Using regenerative braking energy absorbing device in the substation will be further reduct energy consumption and slow the temperature rise of tunnels and underground stations, and improve air quality.The paper focuses on absorbing device of the type of inverter feedback control scheme, based on a subway line, through the creation of accurate models and simulation to verify that the inverse variable feedback type absorption device programs can achieve good absorption in the section line. The innovation of this paper is:a ccurate simulation of the specific line operating condition and the designed program is1500V DC feedback to the substation0.4kV AC power grid for the lighting of station power, the pressure does not affect the metro network under the premise of the rational use of regenerative braking energy.Firstly be on the basis of access to relevant literature, to master a variety of existing regenerative braking energy absorbing device principle, established for the physical model of the substation system, focusing on analysis of24-pulse rectifier and its model; subway train power transmission physical models, including AC traction inverter model, the AC motor model; regenerative braking energy generation mechanism, and summarizes current regenerative braking energy absorption, quantitative calculation of the size of the regenerative braking energy from a kinetic point of view; determine the overall system program, to determine the main circuit diagram of the system to calculate the main components parameters, including the IGBT parameters, filter parameters, the selection of the DC capacitor, the inverter AC side harmonic composition and theory; summarizes the pulse width modulation of three kinds of key generation method, namely, the tradition of SPWM, improved version of SPWM SVPMW and control of the PWM inverter circuit to determine using the current closed-loop control of SPWM strategy. The final establishment of the absorbing device model using Matlab/Simulink, and set various parameters, respectively, to simulate different initial braking speed, different grid density, whether the input energy absorbing device, the input harmonic suppression module, the DC side of the net pressure waveform, AC side of the net pressure waveform, the AC side current waveform, the AC side current harmonics.The simulation results demonstrate the absorbing device at the design of this article is put into use in a subway line to be able to effectively regenerative braking energy inverter feedback to0.4kV AC power grid, to stabilize the straight drift pressure. In addition, get the regenerative braking energy and the initial braking speed, the qualitative relationship between the grid density, Through the simulation, suppress the harmonic of inverter device. Some of the parameters of the program need to pay attention to and suggestions for improvement. The above analysis can be for the actual project to provide a theoretical foundation and guiding significance.