Three-level inverter speed sensorless system with field orientation control

The basic structure of three-level inverter is introduced and its space vector control strategy is derived from the operational principle. An improved SVPWM control algorithm is adopted as the control strategy for the inverter in order to compensate the neutral-point shifting. Besides, MRAS(Model Reference Adaptive System) is researched and is applied to three-level inverter in double closed-loop control of rotation speed and magnetic flux. Validity and feasibility related to this technique are proved through simulation results.