| Recently, with the development of Power Electronics Technology, it is possible to improve the medium voltage frequency inverter technology. Thus, it is important to design three-level PWM rectifier. The main advantages of three-level PWM rectifier are allowing high voltage intensity of IGBT, reducing the ratio of voltage ascension, and achieving lower harmonic distortion than two-level rectifier at the same switch frequency.In this paper, the principle of three-level rectifier is firstly introduced. Then, the three-level space voltage vector control method is analyzed. Three-phase voltage can synthesize a rotational space voltage vector. By adjusting the time of three-phase voltage vector in one section, the magnitude and direction of the rotational voltage vector can be controlled.Secondly, the main-circuit of three-level rectifier, the protection and drive technology about IGBT and control system based on PIC18F458 microprocessor are designed, and a set of low power three-level rectifier is accomplished for the experiment. Finally, the software of control system and the result of the experiments are proposed. |
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