Research On Regenerative Braking Energy Feedback Technology Of Urban Rail Transit

In the 1980 s,China opened its door to the world and embarked on the road of reform and opening up.With the development of urbanization,the problems of urban environment and transportation have become increasingly prominent.It has become a social consensus to solve urban traffic congestion,protect urban environment and save energy.Developing urban rail transit is an effective way to solve urban traffic congestion and reduce urban environmental pollution.Especially since the 21 st century,with the rapid development of urban size,many large and medium cities in China have begun to enter the rail transit times,so the regenerative braking technology of urban rail transit system,the city railway train regenerative braking energy recycling feedback power grid,both in energy saving and sustainable development to the urban environment has strategic significance.Firstly,this paper introduces the urban rail transit system,investigates various absorption schemes and principles of regenerative braking energy treatment of trains,briefly introduces the basic working principles of the components of the air braking system of urban rail transit vehicles,and the correlation between the cooperation and application of air braking and regenerative braking.The characteristics of four regenerative braking energy utilization modes are summarized.Through comparative analysis,this paper takes the regenerative braking energy utilization scheme of inverter feedback type as the research object,and discusses the key technology of regenerative braking energy recycling.Secondly,it introduces the related technical requirements of urban rail transit power supply system in China.In this paper,24 pulse-wave rectifier,the core device of traction substation in power supply system,is analyzed in detail,and its basic parameters are designed.At the same time,the traction transmission system of urban rail vehicles is analyzed,which lays a foundation for further analysis and design of regenerative braking energy feedback scheme.Then,the feedback technology of bidirectional AC/DC converter is analyzed,with emphasis on the working principle,control modulation method and control strategy of three-phase PWM rectifier,the core device of inverter feedback device.Through theoretical analysis,the relevant technical parameters are derived and calculated,and the solution method of inverter harmonic is analyzed to provide a solid theory for the realization of regenerative braking energy feedback technology of vehicles.Finally,MATLAB/Simulink simulation software is used to simulate low-voltage inverter feedback technology and energy feedback.The simulation results show that the PWM feedback inverter can effectively suppress the voltage rise phenomenon of the catenary when the urban rail vehicles brake,and realize the feedback utilization of energy and reactive power compensation at the same time.