Optimal System Design Of Inverter Feedback Device For Urban Rail

In recent years,with the development of urban rail transit in China,the regenerative braking energy utilization technology has been widely used.And the idea of improving the regenerative braking efficiency,reducing energy consumption and reducing operating costs have a great significance for the sustainable development.Medium voltage inverter feedback device not only has the function of energy feedback,but also can restrain the surge of traction electric network voltage,improve the quality of power supply,meanwhile,it also takes into account the reactive power compensation function.How to effectively use the regenerative braking energy to reduce the investment return period has become a research hotspot,thus,in this paper,the configuration scheme of inverter feedback device in power supply system is studied.Firstly,this paper discusses the background and significance of the research,and briefly describes the development and application status of regenerative braking energy utilization technology and equipment.The traction substation model?vehicle model and DC traction network model have been analyzed in detail.And in the substation model,the output characteristics and no-load voltage characteristics of the rectifier unit are discussed,which provides some support for the research of traction power supply system included inverter feedback device.Because of the reversed power flow?reversed current and constant voltage,when the device works,this paper uses the voltage source converter model and abandons the thyristor converter model.At the same time,this paper also research the inverter control strategy and put forward a urban rail transit AC-DC hybrid power flow calculation method and calculation steps included inverter feedback device.Through the VS environment,this paper realizes the AC-DC traction power supply system simulation platform combined with inverter feedback device,and provides the basis for optimal design of inverter feedback system.The correctness of the simulation is tested by true subway line and the influence of the departure density and the device starting voltage on the energy saving is analyzed.Finally,considering the regenerative braking energy saving effect?regenerative braking failure rate of train?device capacity and price,this paper proposes an optimal configuration method to reduce the investment cycles,and takes a subway line as an example,analysis the energy saving effect?optimal location and optimal capacity.Select a best scheme by comparison.