Abstract
Constant-frequency torque regulator–based direct torque control (CFTR-DTC) provides an attractive and powerful control strategy for induction and permanent-magnet motors. However, this scheme has two major issues: A sector-flux droop at low speed and poor torque dynamic performance. To improve the performance of this control method, interleaving triangular carriers are used to replace the single carrier in the CFTR controller to increase the duty voltage cycles and reduce the flux droop. However, this method causes an increase in the motor torque ripple. Hence, in this work, different discrete steps when generating the interleaving carriers in CFTR-DTC of an induction machine are compared. The comparison involves the investigation of the torque dynamic performance and torque and stator flux ripples. The effectiveness of the proposed CFTR-DTC with various discrete interleaving-carriers is validated through simulation and experimental results.
Highlights
There are two well-established control strategies for high-performance motor drives: Field orientation control (FOC) and direct torque control (DTC) [1,2,3]
The most common problems linked with the classical DTC are flux droop in the low-speed region, variable switching frequency, large increase in the flux, and torque ripples
The induction motor (IM) dynamic modeling can be given in terms of space-vector relations, which are described in the stator stationary-reference frame as follows
Summary
There are two well-established control strategies for high-performance motor drives: Field orientation control (FOC) and direct torque control (DTC) [1,2,3]. The most common problems linked with the classical DTC are flux droop in the low-speed region, variable switching frequency, large increase in the flux, and torque ripples. The common method used to enhance the DTC performance is adopting SVM (known as DTC-SVM) In this scheme, an appropriate voltage reference should be well estimated for the complete utilization of SVM, and, it contains extra control methods, such as PI torque and flux regulators, dead-beat control, and sliding-mode control [4,5,6]. An appropriate voltage reference should be well estimated for the complete utilization of SVM, and, it contains extra control methods, such as PI torque and flux regulators, dead-beat control, and sliding-mode control [4,5,6] This scheme has the merits of obtaining a constant-switching frequency and fewer torque ripples, the torque dynamics and simplicity of the classical DTC are lost.
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