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A simplified pulse width modulation (PWM) strategy for a neutral-point-clamped three-level converter with unbalanced dc links is proposed in this paper to achieve high-quality line-to-line output voltages and to maximize the linear modulation range. The simplified strategy takes the direct output voltage modulation by calculating the special solutions of the voltage–second balance equations without...
In view of the existing problems of synchronous motor vector control system with mechanical sensor, sensor less motor control technology of synchronous motor is studied. A novel rotor position estimation method without mechanical sensor was suggested in this paper based on high-frequency signals injection into the rotor. With the structure of the synchronous motor itself as rotor position sensor,...
The effect of vector control for Induction Motor (IM) largely depends on whether the motor parameters are accurate. However, the motor resistance parameters are varying as the temperature is changing. In the vector control system, the motor resistance parameters need to be online identified and the control model parameters should be online modified. Based on the relationship between the motor winding...
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