부산대학교 도서관

This paper presents a method of speed control for asynchronous motors fed by a Three-level quasi-Z Source T-Type Inverter (3L-qZST 2 I). Field Oriented Control (FOC) strategy transforms the current coordinate on the stator and the motor shaft speed to generate reference voltage signals for space vector modulation (SVM). The flux and torque of the motor are provided by direct current (id) and quadrature current (iq). The PI controller is used to control the reference speed and torque by adjusting the shoot-through ratio, the impedance source provides higher DC-link voltage to the inverter with constant input current thereby giving better AC voltage efficiency. Furthermore, the THD generated in 3L-qZST 2 I is reduced compared to the traditional algorithm. The results of the analysis and simulations will be presented to demonstrate the accuracy of this strategy.