Research On The Energy Feedback System Of Urban Rail Transit

Urban Rail Transit rely on the electric power to provide energy. Nowadays urban railway transit system grows flourish, the energy consumption of urban rail traffic is increasing very rapidly. Research on energy-saving technology is more significant, It is the direction of the urban railway transit's development.First, The main method utilization of regenerating energy is introduced in this paper. Through studying the pros and cons of these models, this paper takes a measure which feedback regenerating energy into the grid, in order to realize the purpose of energy conservation. The method is based on power conversion technology, so this article focuses on invertor use in energy feedback in grid and it's waveform modulating technology.Through the using patterns of renewable energy,this paper draw the design program of the renewable energy grid connected of system, describe the process of running, according to the actual situation of Guangzhou Metro select the system capacity, ground resistors. Make a proposal a hybrid braking energy absorbing equipment composed of resistor and inverter, This proposal can reduce investment.In this paper, Different types of filters is analyzed. The result show that LCL filter has better performance in high-frequency harmonics suppression with less inductance comparing with L and LC filter, and then do some analysis and tuning about this strategy.System modeling and stability analysis have been accomplished in this paper. Then it carrys out the double-loop feedback strategy which the inner loop feedback capacitance and electric slide, and the outer loop feed back output current,and then do some analysis and tuning about this strategy.With the MATLAB software,this paper does some system simulation experiments on the feedback grid-connected system design and its's control strategies. result from simulation experiments. The systerm can trace output current under the two-loop control system, and the output current harmonics content can meet the grid-connected requirements. Finally, the main control circuit of the system is designed, the control system software is design, and the software phase locked loop is analyzed and design.