Research On Digital Control Of Three-Phase Inverter

Digital control is being paid more and more attention in power electronics for its advantages such as control flexibility, high integration and complex control ways and strategies. Digital control can get powerful function and high performance which is difficult for analog control.In this dissertation, digital control method for three-phase inverter is researched. First theoretical analysis and digital simulation are used to do research. The combination model of PSB and SIMULINK to three-phase inverter is constructed. The control character of inverter is also analysed.Based on this, the experimental model system of the inverter, which is controlled by DSP of TMS320F240, is researched. SPWM method is adopted to control the inverter model. Digital PID adjuster is used to realize voltage loop and the value modulation is used to maintain the value of output voltage. The whole hardware and software of the experimental inverter model are constructed and analysed. The possibility and superiority of control method is proved by the simulation and the experimental model system of three-phase inverter. All of above are propitious to the deeply research and application of the digital control of three-phase inverter.