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

As a large capacity, fast speed, less pollution and comfortable transportation, urban rail transit effectively alleviate the transportation pressure of the large and medium-sized city, environmental pollution and traffic congestion. In recent years, China began to develop the light rait transit and subway。The subway stations has shorter distance and locomotive has high density running. During locomotive frequently braking, it produced considerable regeneration energy. Reasonable utilization of the regeneration energy not only save energy, protect environment but also reduce the voltage grade for the locomotive’s safety operation. This paper is the focus on utilization of the regeneration energy, and The inverter-resistance hybrid method is proposed. This topic is purposed to build Metro regenerative braking and energy absorption simulation platform, and establish the locomotive braking model and inverter-resistance hybrid energy absorption model by simulation software.Firstly, the urban rail transit power supply system has been introduced. Several vehicle braking scheme has been summarized and analyzed for their advantages and disadvantages. The inverter-resistance hybrid of regenerative braking energy absorption solution has been purposed.Secondly, based on the theory of24pulses rectifier, simulation model was built and the parameters of the transformer was reasonable designed. Based on the principle of subway locomotive operation, AC locomotive power supply scheme was established. SVPWM was designed as the control strategy of traction motor. The main circuit and control circuit was built by MATLAB/Simulink for analyzing the locomotive traction and braking process.Then, according to the basic principle of inverter and grid-connected, the main circuit was designed and the energy feedback to380V power system. The classical PI double-loop control was established for control system. The parameters of LCL filter and PI were designed and PLL simulation model was built.Finally, combined with inverter and resistance braking scheme, the model was built analyze and the power and current of regenerative braking was computed.