Abstract
This paper proposes a novel deadbeat torque and flux control (DB-DTFC) to reduce torque ripple for switched reluctance motor (SRM). DB-DTFC combines the advantages of direct torque control (DTC) and space-vector modulation (SVM). DB-DTFC leads current vector control into DTC in order to find the equation between torque and current through deadbeat prediction theory i.e. a beat reaches a given point. In addition, the deadbeat calculation module here is similar to that of permanent magnet synchronous motor. Based on dq0 reference frame of SRM, the most suitable dq0 axis current of next moment corresponding to different torque errors is calculated and predicted. According to the calculated dq0 axis current, the optimal space voltage vectors can be selected to reduce torque ripple. In order to verify the effectiveness and correctness of the proposed scheme, DB-DTFC is verified and compared with the DTC-SVM by simulation.
Highlights
As a new type of reluctance motor, switched reluctance motor (SRM) has attracted much attention because of its outstanding advantages, such as simple and robust structure, wide speed range, good reliability and high efficiency [1]
With the development of direct torque control (DTC), many DTC-based control method has been explored. [3] proposes direct instantaneous torque control (DITC) based on double hysteresis control. [4] proposed the direct torque and predictive flux control method based on model prediction of SRM
Since Deadbeat direct toque flux control (DB-DTFC) have both advantages of DTC and space-vector modulation (SVM), this paper proposes a novel DB-DTFC of SRM based on dq0 coordinate system and deadbeat prediction theory
Summary
As a new type of reluctance motor, switched reluctance motor (SRM) has attracted much attention because of its outstanding advantages, such as simple and robust structure, wide speed range, good reliability and high efficiency [1]. DB-DTFC has the advantages of DTC and SVM, and can calculate the d-q axis current through torque error, so as to the selection of optimal voltage vectors. Because of these advantages, DB-DTFC has been applied interior permanent magnet synchronous machine (IPMSM) [6] and synchronous reluctance motor [7]. [12] proposes a new current vector control method based on the dq0 coordinate system and emphasizes the effect of zero-phase current on the torque control. Since DB-DTFC have both advantages of DTC and SVM, this paper proposes a novel DB-DTFC of SRM based on dq0 coordinate system and deadbeat prediction theory. It is compared with DTC-SVM for the performance of torque ripple under different conditions
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