Research On Train-assisted Inverter Hardware-in-the-loop Test DC Source

With the development of China's economy,the Rail transportation industry has entered a period of development.The auxiliary inverter is one of the important components of the train,which has an important impact on the stable and comfortable operation of the train.In the process of train operation,the load and power supply of auxiliary inverters are complex.Therefore,it is especially important to study the influence of input power supply changes on the operation of the auxiliary inverter.Since the train auxiliary inverter operates,the DC power supply voltage is high and the voltage range is wide.It is difficult for the DC power supply to provide a suitable test power supply.Therefore,it is necessary to study the test DC source of the auxiliary input power supply of the auxiliary inverter.In this thsis,the topology of the test DC source is designed,and the neutral point potential balance control and main circuit control of the DC boost module are improved.The specific research contents are as follows:1.Analyze and test the working characteristics of the DC source,select the appropriate topology and analyze its working process.The operation process of two working modes of continuous current and intermittent current is analyzed in detail.Finally,the advantages and disadvantages of the two working modes are compared and analyzed.The critical conditions for the two modes of operation are derived.2.Study on the potential of the potential in the DC boosting part(TL-BOOST converter).Firstly,the principle of the neutral point potential balance control is analyzed,the mathematical model is established,and the control process of the fuzzy PI control algorithm is analyzed.The design is fuzzy.PI controller for simulation verification.3 For the negative overshoot phenomenon of the output voltage of the DC boosting part,the predicted PI control and Smith predictive control are compared and analyzed,the mathematical model needed for the control is established,the design predictive PI control is improved,and the simulation model is established for simulation verification.4.Design a physical verification platform based on FPGA,design the main circuit of the test DC source,design the sampling and conditioning circuit and design the drive circuit.According to the improved control of the potential balance in the DC boosting part and the improved control of the main circuit,the design of the FPGA controller is carried out,and the physical source verification is performed on the test DC source.