| In recent years, with the great development of the city size and population, the demandto transportation is increasing day by day. As the representative capacity of the largemodern traffic tools, the urban rail transit has been adopted in a number of large andmedium-sized cities in our country. How to upgrade the construction level, improve theenergy utilization and decrease the operating costs，in order to meet the demand oflow-carbon economy and energy saving become the core purposes of the research to theurban rail transit.Presently, regenerative braking technology is generally used in urban rail trains. If theregenerative braking energy cannot be absorbed promptly, it would lead a voltage rise to thetraction network, which will affect the safety of the power system and the trains. In order toimprove the utilization of regenerative braking energy, and ensure the safety of the trains,this paper analyzed the characteristics of regenerative braking energy, and gave a researchon different kinds of regenerative braking energy absorption solutions. We focused on theenergy consumption mode and regenerative energy storage mode, and based on this weimprove the regenerative energy storage scheme.Firstly, the principle of urban rail transit regenerative braking energy is analyzed, thecharacteristics of the regenerative braking energy is introduced. Also the SVPWM speedcontrol method which is mostly applied to control the speed of the train in urban rail isintroduced. According to the characteristics of the regenerative braking process and byusing this control method, we established the simulation model of urban rail traction. Thus,we analyzed the characteristics of regenerative braking energy and the impact of differenttrain density to the traction network voltage by simulation.Secondly, the regenerative braking technologies of resistance-type, storage-type andinverter feedback-type are analyzed and compared. The regenerative braking energy storagetechnology has more advantages in terms of energy utilization rate, technology maturity.Also it has the character of having no effect to power system, and if appropriate energystorage device is chosen, its work life can achieve the requirements.Then, the resistance-type regenerative braking energy absorbing model is established,and the energy-saving effect of different turn-on voltage is analyzed by simulation. Commonly used energy storage characteristics were compared in order to choose thesuitable device for urban rail transit regenerative braking energy. After that, by usingMATLAB/Simulink, we established the model of regenerative braking energy storagemode in urban rail transit. Also the simulation result is analyzed.At last, we improved the regenerative braking energy storage mode by proposing aIntegrated absorption method based on energy storage mode which combines the energyfeedback inverter, the storage device. Again we constructed a model in MATLAB/Simulink,and give an analysis to the simulation results. It demonstrate the integrated absorbed energystorage in Urban Rail Transit regenerative braking energy use programs to stabilize the DCtraction network voltage, improve the quality of power supply, but also to achieveenergy-saving and reactive power compensation. |
PDF Full Text Request