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This paper presents Direct Torque Control (DTC) of induction motor drives using three-level Neutral Point Clamped (NPC) inverter. The usage of hysteresis controller that utilized in conventional DTC lead to varying switching operation, therefore a Constant Switching Frequency (CSF) torque controller is proposed to replace the torque hysteresis controller. The proposed CSF controller consists of Proportional-Integrator...
Direct Torque Control of induction machines is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme has two major disadvantageous namely variable inverter switching frequency and high torque ripple. These problems occur due to the use of hysteresis comparators in the conventional DTC scheme, particularly in controlling the output torque. This...
This paper presents a simple overmodulation method employed in direct torque control (DTC)-constant switching frequency (CSF) controller of induction machines. The proposed overmodulation method is utilized to extend a constant torque region and hence produces high torque capability in field weakening region with six-step operation. It will be shown that the overmodulation operation using the DTC-CSF...
This paper presents a new, accurate and simple calculation method to determine the switching frequency as well as semiconductor losses and junction temperatures in direct torque controlled induction motor drives. Instantaneous values of the switching frequency, semiconductor losses and junction temperature can be obtained on the basis of mechanical operating point data and the stator flux vector location...
Direct torque control (DTC) used in AC-drive locomotive control system, which has been developed in the recent decade, is a control strategies with high dynamic and static performance, and it directly generate the inverter gate control signal by judging the output of the stator flux, torque hysteresis comparator and the position information of the stator flux that cause the switching frequency unfixed...
This paper demonstrates the direct torque control permanent magnet synchronous motor (DTC-PMSM) drive fed by asymmetrical multilevel inverter. The cascaded H-bridges topology with ratio-3 DC voltage sourced cells inverter has been employed. The DTC controller receives a reference torque and flux signals, the torque controller output determines the position of the desired flux vector. The amplitude...
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