In multi-level inverters, the voltage stress of each power device is relatively lower. That is suitable to realize the high voltage and large capacity inverters with the low voltage resistant power devices. And it is possible to enhance the quality of inverter’s output voltage obviously by using multi-level inverter. Therefore, with the development of power devices, the multi-level converter technology has been an effective approach for inverters to achieve high voltage and large power.
Initially, summing up the development prospect of power electronic technology and the development status of multilevel inverter control technology. Based on the principle of two-level inverter, three-level inverter is studied on and the advantages and disadvantages of the three-level inverter’s two canonical topology structure are comprehensively compared. The three-level inverter with diode clamped is introduced, which is analysised about advantages to the two-level inverter. It embody the important significance of the subject research.
In the end, by founding MATLAB/SIMULINK model. Analysis the main circuit、electrify cushion circuit、PWM signal generate、current and voltage sampling、IGBT drive and protect circuit.