Digital Three-phase SVPWM Inverter Closed-Loop System Based On DSP

Nowadays, because the requirement of high quality and reliable power supply is developing very quickly, more and more electric power must be alternated by power electronics before they are used in civil, industry or military territory. The inverter is one kind of key component that alternates the electric power, and has ability to export high quality voltage waveforms. With quick improvement of the performance of DSP (Digital signal processor), Digital inverter are becoming more popular.This thesis introduces the design scheme of digital three-phase SVPWM inverter closed-loop system based on DSP. This design scheme includes the design of inverter main circuit, and the software and hardware design of inverter digital control system. The design of inverter main circuit consists of four sections. First is the design of rectifier that can repress imported surge current. Second is the design of three-phase inverter on-off circuit with the efficient snubber that is applicable to the high on-off frequency circuit. Third is the design of the transformer. The last is the design of LC output filter. The digital control system adopt voltage style PWM control scheme, which consists of DSP chip TMS320LF2407A, the drive circuit and the high speed data-sampling circuit and so on. When carrying on the design of digital control system software, this thesis particularly introduces the design of SVPWM control algorithm, digital PI algorithm, complex fast Fourier transformation algorithm and FIR digital filter, and gives out the control system main routine flow diagram and the experimental results based on these algorithms. Finally this thesis carries out the preliminary researches to the three-level inverter that can carry the high voltage high-power load, gives out Matlab model and simulation result of the three-level inverter.