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Since there's a biggish output ripple in current direct torque's control, we design a direct torque control system for three-level inverters used in asynchronous motors by analyzing the operational principle of the diode clamped three-level inverters, and simulation is done as well. Ripples of the torque and the rotational speed of the motor can be deduced effectively, and a stable output and a good...
The vector control strategy for double-fed induction motor fed by back-to-Back dual three-level converter was studied in this paper. The accurate observer and effective control of the stator flux for double-fed induction motor has significant sense to the performance improvement of vector control system. In the thesis, two one-stage low-pass filters are adopted instead of the pure integrator in the...
To solve the problems of large flux and torque ripples and inconstant switching frequency in direct torque control (DTC) for permanent magnet synchronous motors (PMSM) and to eliminate speed sensor since it deteriorates system reliability and increases the cost of system, a novel speed sensorless DTC method based on space vector modulation (SVM) is proposed in this paper. This method is based on the...
The control strategy which the direct self-control was proposed to brushless DC motor system achieved the high performance with its simple structure and the torque control was the center. However, at lower speed, the distortion of stator flux-linkage waveform made the operating performance of brushless DC motor lower as the impact of stator resistance voltage drop. Thus, a new approach was brought...
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