Research on Space Vector PWM of Five-Phase Three-Level Inverter

Abstract

Aiming at five-phase permanent magnetism synchronous motor (PMSM), this paper sets up the variable-frequency variable-speed system supplied with three-level inverter and makes study about space vector PWM control algorithm of five-phase three-level inverter. In the control method of voltage space vector, the converter and machine is seen as a whole body, so it has the advantage of good control effect and high voltage usage. For multi-phase multi-level inverter, the numbers of voltage vector and switching state grow rapidly with the increment of phase and level. Firstly, the output voltage vector should be chosen appropriately when use the method of space vector PWM (SVPWM), and then the actuation duration of each in a control cycle can be figured out simply and quickly. Secondly, the output voltage vector should be optimized and the switching sequence be selected properly to decrease switching loss. On the basis of profound analysis about characteristic and rule of five-phase three-level inverter's voltage vector, a simple and practical control algorithm of voltage space vector PWM is put forward, and it is proved by simulation experiment.