A novel DTC scheme for a three-level voltage source inverter with GTO thyristors
作者： R. Zaimeddine , E. M. Berkouk
DOI:
关键词: Comparator 、 Thyristor 、 Voltage 、 Torque 、 Stator 、 Vector control 、 Induction motor 、 Control theory 、 Direct torque control 、 Engineering
摘要: The object of this paper is to study a new control structure for sensorless induction machine dedicated electrical drives using three-level voltage source inverter (VSI). Compared classical Field Oriented Control (FOC), which necessitates generally three feedback loops with PI regulators, current-regulated PWM converter, and two coordinate transformations, Direct Torque (DTC) uses only couple hysteresis comparators perform both torque flux dynamic control. output voltages the VSI can be represented by four groups : zero vectors, small middle vectors large in (d, q) plane. Then, amplitude rotating velocity vector controlled freely. Both fast optimal switching logic obtained. selection based on value stator torque. results obtained novel DTC show superior performances over FOC one without need any mechanical sensor.
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