A Powerful and Efficient Hysteresis PWM Controlled Inverter

AbstractA new, control strategy related to hysteresis control method fur inverters is presented. it permits to form the output wave easily and efficiently by means of PWM. This formation method is based on a new powerful modulation mode. The proposed inverter control scheme allows improvements on the AC drive performances while using simple dedicated hardware. The flexibility gained by the proposed method can achieve easily the self adaptation with minimum switching, frequency, and consequently high inverter capability. The proposed scheme would be attractive for recent applications that requires non standard wave forms. in this paper, firstly, a comparison between the known bipolar and unipolar modulation modes is given. The drawbacks of these modulation modes are studied and a modified hysteresis controller is proposed. Then a new hysteresis control structure is presented and tested. it realizes an efficient and powerful modulation method that provides a so called freepolar PWM mode. This mode exhibits ...