The Rail Transit UPS Research Of On-line Centralization Based On DSP

With the development of China’s economic construction, urban rail transit plays moreand more significant role on daily resident life and urban infrastructure construction.If thepower supply system of urban rail transit interrupted, not only harm urban rail transitnormal operations,but also cause national property loss and accidents.Uninterruptible power supply (UPS) plays a decisive role on the power supply systemof urban rail transit where is to meet high security, high reliability and on the base of highavailability power supply. Among various kinds of structure of UPS, On-line UPS hasgood quality of power supply, fast switching speed and high availability.So the paperfocuses on UPS.As the significant link of UPS,Inverter is improving demand of output performanceand power density.So the main circuit structure of inverter plays significant role onpower conversion.Not only affect the efficiency of power conversion,but also determinethe reliability and stability of system.The paper puts forward traditional single-phase brightinverter with passive lossless buffer circuit structure.The same is to discuss AC-DC-ACinverter construct.Finally the paper also puts forward Z source inverter that solve thestraight connection problem.The same is to improve conversion efficiency.Power device is working under high frequency and principal contradiction is switchloss.To improve the efficiency of the converter. The DC/DC link and DC/AC link brings inZVS technology, also, complete the parameter of snubber circuit, filter and soft switchauxiliary circuit. It is given the general design method of relevant parameter.To extend service life of battery.Researching on holographic new storage system withtemperature compensation, overcharge and overdischarge design classification chargingtype and complete controller design of battery management.Researching on all kinds of linearization control mathematical model of powerconverter.It is applied to UPS system with the control theory of repetitive controlcombined with proportional control and complete the main control chip based on DSPmodle of TMS320F2812.The modle is able to eliminate the disturbance of periodic waveform, also, putting forward the compound control scheme combined with PID controlis to improve the dynamic performance of inverter.Based on mass simulink.It is verifiedthat inverter can bring in satisfactory dynamic and steady-state waveform and verify thesystem scheme rationality.