A New Energy Feedback Equipment Of Traction Drive Test Platform With Detection Software

Metro traction power supply with its "public transportation" transportation mode determines that its traction motor undergoes frequent start-up acceleration and braking deceleration,which consumes a lot of electric energy in the acceleration stage,and there will be regenerative electric energy in the braking stage.DC bus voltage will fluctuate due to the generation of regenerative electric energy.At present,most domestic test platforms use discharge resistance to consume regenerative electric energy,which is not only a waste of regenerative electric energy,but also a burden on heat dissipation equipment,resulting in secondary waste of electric energy.Therefore,based on the analysis of traction load characteristics,power consumption analysis of energy feeding device and detection system configuration,through the establishment of The modeling of control loop and energy feedback system,real-time simulation,design a set of technical scheme of urban rail transit inverter feedback,and carry out corresponding software development and relevant theoretical research,which is of great significance to ensure the voltage stability and energy saving of DC traction network.Firstly,this thesis introduces the traction drive system of rail transit DC electric locomotive,and studies and analyzes the control principle and coupling strategy of asynchronous motor.According to the traction drive system model built by Matlab /Simulink,the regenerative braking energy is calculated,and the changes of motor speed,torque,stator current,traction network voltage and power under different working conditions are simulated in real time.Secondly,by studying the working mechanism of DC / AC inverter,LCL filter,SVPWM control method of inverter and PLL phase-locked loop,the scheme design of inverter feedback device is carried out.Then,the inverter feedback system model built by Matlab / Simulink is used to simulate various working conditions,and the current and voltage simulation results before and after inverter are analyzed to fully restore the real situation,It provides a reliable data source for the design of medium voltage inverter feedback regenerative braking energy absorption device.Finally,by using LabVIEW＿FPGA and Ethernet communication transmission technology,design the DC traction drive energy feed system,and improve the cache design between each module.At the same time,in order to test and analyze the traction drive energy feed system,the upper computer software system is designed,and the program and interface of threshold setting,alarm,data processing,waveform display and other functions are displayed on the LabVIEW development platform.The experimental results show that the designed traction drive test platform,energy feedback device and traction energy feedback detection software system have better energy feedback performance under different working conditions,less interference to the power grid and good grid connection effect;At the same time,the designed traction energy feedback detection software system collects and compares the experimental data combined with the specific test,and can use the software to complete a series of work such as acquisition,processing and detection.