This paper presents a method to extend the DC bus utilization on an induction motor (IM) by using a combination of Space-Vector Modulated Direct Torque Control (DTC–SVM) and conventional DTC. The scheme proposed in this paper exploits the advantages of both control methods. During the linear region, it allows for a low torque ripple and low current harmonic distortion (THD). During the overmodulation region, it allows for the fastest torque response up to the six-step operation region. In both regions, there is complete independence of the motor parameters. The paper describes a way to provide a smooth transition between the two control schemes. Non-linearities affect the stator flux angle estimation, which leads to the inability to decouple torque and flux. To overcome this problem, a novel PI-based control scheme as well as a simplification on the decoupling terms’ calculation are proposed. Simulation and experimental results are presented to verify the feasibility of the proposed method.
A new direct torque control (DTC) method of an induction motor (IM) which minimizes torque ripple T ripp while preserving all the conventional DTC advantages is presented in this paper. Large T ripp and current ripple are the main drawbacks of the conventional DTC. To address this problem, this paper gives a qualitative analysis of the main T ripp sources of the conventional DTC. A novel strategy to reduce T ripp in the constant T and in the field weakening (FW) regions is proposed. The performance of the proposed method is evaluated and compared with a recently published method that aims for the same goals that are pursued in this paper, as well as with the conventional DTC. The analysis has been carried out on the basis of the results obtained by theoretical analysis and hardware implementation.INDEX TERMS Direct torque control, torque ripple, dynamic response, acceleration process.
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