Pages : 1 – 10
E. E. El-Kholy, Ahmed E. Kalas and M. El-Shahat Dessouki
The most problem associated with the conventional two-level phase hysteresis controller is variation of switching frequency over the entire operating speed range of an induction motor (IM) drive. This paper presents a new variable band hysteresis current controller (NVB-HCC) for controlling the switching frequency variation in the two-level PWM inverter fed IM drives for various operating speeds. A novel concept of online variation of the band based on both the instantaneous load current and current change for each sampling period is presented to determine the hysteresis band. To verify the feasibility of the proposed scheme, computer simulations and experiment results are provided. These results demonstrate that the proposed method can obtain constant switching frequency and improve the performance of the IM drive system.