Nonlinear modeling and test of inverter based on FPGA

Abstract

A inverter system nonlinear model based on FPGA for hardware in the loop (HIL) real-time simulation has been proposed in this thesis. Not only the switch voltage drop of IGBT and diode voltage drop, but also the IGBT transient process achieved by a linear approximation is considered in the inverter model, which ensures it's more advanced than those before in HIL realtime simulation. The simplified nonlinear model has been built and tested in the HIL real-time simulation in the thesis. The test result shows that the nonlinear inverter model presented in this thesis can improve the previous inverter models in the real time simulation. Its system delay is only 140ns, and it can effectively reflect the turn on process and turn off process, dead time effects, the IGBT transient process and the diode voltage drop of inverter, as well as the feasibility and advantages of the HIL semi-physical real-time simulation.