Research Of SVPWM Inverter Based On DSP

The space voltage vector PWM (SVPWM) technology can realize digitization more easily than normal SPWM.So it is used widely, and extends to high-voltage and large-capacity fields gradually. In such fields, switching losses are requested to decrease strongly. And lower the capacity standard of the switching devices.Firstly, the thesis introduces the principles of PWM convertor simply, and advances the concept of SVPWM. Then, it analyses the working principle of general PWM modulation,and deduces the SVPWM digital algorithm. At the same time, the digital simulation is done by computer to realize it.To decrease switching dissipation and raise efficiency of the controller switching times can usually be decreased to four during every sampling period by the means of selecting zero vectors properly. Switching frequency is decreased by 33 percents accordingly and switching losses is decrease largely at the same carrier wave frequency. This thesis analyses the peculiarity of several optimized methods of SVPWM roundly, simulation experiment is done. The harmonic peculiarity of carrier waves of each optimized method and expresses elementary ideas in methods of decreasing switching dissipation above-mentioned essentially. Then, on the base of theoretic analysis, the thesis proves that the best method of optimized SVPWM is an ideal control strategy, of which the none-switching sectors in each half period, distributes on both sides of the current peak value symmetrically. To realize the arithmetic of the ideal optimized method, the thesis advances a simple digital arithmetic, and the simulation experiments prove its feasibility.Finally, the thesis describes the way and process of the realization of SVPWM optimized method in DSP.