Discontinuous pulse-width modulation (PWM) techniques result in reduced power loss in voltage source inverters. This study presents the space vector approach to the three-level discontinuous PWM technique. The switching sequences for four basic types of discontinuous PWM and the implementation are presented. An improved discontinuous PWM algorithm is presented for low modulation index region. All these algorithms are verified experimentally and the results are presented. The performance of discontinuous PWM algorithms is compared with that of conventional space vector-based PWM algorithms.
This paper deals with sensorless constant v/f closed loop control of high-power induction motor with synchronized space vector pulse width modulation (SVPWM). The rotor speed is estimated based on the difference between the rotor flux speed expressed in stationary reference frame and slip speed. The estimated stator flux and the synchronous speed are used to generate the estimated back EMF. The difference between the reference voltage and the estimated back EMF voltage is used to generate the stator resistance voltage drop compensation required to maintain constant flux at low speed. Synchronized SVPWM technique is used in this closed loop drive. Synchronization guarantees elimination of sub-harmonics and reduces low order frequency harmonics. Thus, the proposed scheme guarantees high performance at high power levels. The simulation and experimental results are presented.
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