Font Size: a A A

Research On The Mixed Type Of Regenerative Braking Energy Absorption And Utilization Of Metro Traction System

Posted on:2013-12-24Degree:MasterType:Thesis
Country:ChinaCandidate:H C BianFull Text:PDF
GTID:2232330371995947Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Subway construction projects have gone into the fast lane age in China. Due to the large population, especially in some big cities, the urban rail plays a decisive role in city traffic. The locomotive runs with large density, besides the line distance between stations is very short, and therefore the locomotive needs constantly to start and keep the brake, the starting and braking is in high frequency.The newest city rail locomotive’s speed regulation technology makes use of variable voltage and variable frequency mostly. Regenerative braking of the locomotive will produce a large amount of electric energy, and it can even exceed more than30%of total consumption energy of the traction. These electric energy will partly return back to the power supply system, and it makes the traction network voltage increase. When the traction network voltage exceed voltage limit, the remaining part of electric energy will be absorbed by the braking resistor, it can’t get effectively use and waste.The super capacitor is a new component, have a long working life, its charge/discharge current is very high, can be applied to Metro Traction braking energy recovery system.The article is aimed at DC1500V Metro system, design a locomotive regenerative braking energy recycling scheme based on the the super capacitor and resistor.This paper, based on the analysis of the subway locomotive regenerative braking energy generation mechanism, build the model of the24pulse rectifier of the DC1500V metro traction substation, supply power for locomotive; build the dynamic model of A type subway locomotive by MATLAB/SIMULINK tool, simulation of subway locomotive starting and regeneration brake process, and analyzes the changes of network voltage and power during the regenerative braking.According to the calculation of braking energy and the characteristics of traction network voltage variation when locomotive braking, determined the braking resistance super capacitor hybrid regenerative braking energy recovery scheme and the main circuit, analysis the principle of the resistance braking device with capacitor energy storage system for recovering braking energy. Design of the capacitor energy storage capacity of the system and parameters of the main components, design the voltage and current double closed-loop control strategy, analysis the performance of the capacitor energy storage system charge and discharge control strategy.Simulation and analysis the work process of capacitor energy storage system, energy storage system recycle energy when locomotive braking, and release the recycled energy when locomotive start; analysis its effect to traction network voltage; Analysis the braking power and utilization of different grid density, and working status of brake energy recovery device. Simulation results show that the design of the braking energy absorption system has achieved the expected effect.
Keywords/Search Tags:subway power supply, regenerative braking, super capacitor, resistance braking, electric energy storage
PDF Full Text Request
Related items