Research On System Optimization Design Of Urban Rail Reverse Feedback Device

In the power supply system of city rail transportation,inverter feedback device is used more and more widely because of its low cost,good energy saving effect and other factors,but in recent years the academic research about inverter feedback device focus on the device itself,there is a lack of research on how to optimize the design of the inverter feedback device in the system,which is instructive for the reasonable application of the inverter feedback device in the system,so in this paper the inverter feedback device in city rail transit system optimization design is studied.In this paper,the significance of the research is discussed,and the domestic and foreign research status of inverter feedback device is introduced.The modeling of urban rail transit power supply system is specifically carried out.The working principle and simulation model of the 24 pulse rectifier unit and inverter feedback device in traction substation are introduced in detail,and the detailed modeling of DC power supply system and AC power supply system is carried out.The optimization design of feedback inverter device in the system based on the power flow calculation of power supply system,so this paper puts forward an urban rail AC and DC unified power flow calculation algorithm with inverting feedback device,the algorithm contains a variety of working states of the traction station,The AC and DC voltage,current,and power etc.in each iteration of the traction station multi-state switching process are corrected until convergence.Traction substation of the inverter state uses VSC model.This model can dynamically adjust the operating voltage of inverter feedback device and use reactive power control to realize reactive power compensation function.In this paper,the dynamic simulation platform of the algorithm is implemented based on Visual Studio,and the feasibility of the algorithm is verified by an example.Referring to the BS PD CLC/TR 50646:2015,this paper proposes a configuration method of inverter feedback device considering the safety and economy of the system based on the multi train system and multi operation mode power supply simulation.In this method,the installation location of inverters are based on the premise of ensuring the safety of train net voltage and the station rail voltage;considering the maximum effective power in its continuous time interval,the festival consumption,investment cycle device and annual average income and other factors for configuring economic and reasonable capacity of inverter device.This paper takes Chongqing metro line 9th as an example to verify the feasibility of the method and provides a reference for the rational configuration of the inverter feedback device.Finally,this paper presents three kinds of evaluation indexes of the energy saving effect of the inverter feedback device,these can provide a reference for the design and application of the inverter feedback system in the power supply system.