Two approaches for direct torque control using a three-level voltage source inverter

Purpose -This paper is devoted to the investigation of the potentialities of induction motor DTC strategies in position control applications. Design/methodology/approach -A comparison study is carried out between two DTC strategies dedicated to position control applications such as robotic: the Takahashi DTC strategy where the induction motor is fed by a two-level inverter and a new DTC strategy where the induction motor is fed by a three-level inverter. Special attention is paid to the synthesis of the vector selection table of the second strategy in an attempt to guarantee a high dynamic with reduced ripple of the torque. The comparison study is achieved considering four performance criteria: phase current total harmonic distortion; inverter switching loss factor; quality factor; and inverter commutation frequency. Findings -It has been found that the introduced DTC strategy offers higher performance than the Takahashi one. Of particular interest are: the reduction of both torque ripple and commutation frequency; the eradication of the demagnetization problem which is a vital requirement in position control applications; and the improvement of the power factor thanks to which a reduction of the inverter rating is gained. Research limitations/implications -This work should be extended considering the validation of the obtained simulation results through experiments. Originality/value -The paper proposes a new DTC strategy dedicated to position control applications. It allows the elimination of the demagnetization problem from which suffers the Takahashi DTC strategy at low speeds especially at zero speed in position control applications. It also offers a high power factor which opens up crucial cost benefits as far as the inverter rating is concerned.

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“…Referring to the literature (Zaimeddine et al, 2007;Zaimeddine and Berkouk, 2005), only three combinations are allowed, such that:…”

Section: Dtc Strategiesmentioning

confidence: 99%

Potentialities of DTC strategies in position regulation: application to robotics

Bouzidi

Yangui

Masmoudi

2011

COMPEL

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“…Recently, many research efforts have been carried out to reduce the torque ripples and harmonics and to improve the uncontrolled commutation frequency. In fact, in order to reduce the level of torque and flux ripples, several researchers have proposed the use of multilevel inverters [12][13][14], and others have focused on SVM based inverter switching technique [15][16][17][18][19][20]. The inverter switching frequency is ensured constantly by space voltage vector modulation.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of DTC-SVM Sliding Mode Controllers-Based Parameters Estimator of Electric Motor Speed Drive

Salem

Derbel

2014

Mathematical Problems in Engineering

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This paper is concerned with a framework which unifies direct torque control space vector modulation (DTC-SVM) and variable structure control (VSC). The result is a hybrid VSC-DTC-SVM controller design which eliminates several major limitations of the two individual controls and retains merits of both controllers. It has been shown that obtained control laws are very sensitive to variations of the stator resistance, the rotor resistance, and the mutual inductance. This paper discusses the performances of adaptive controllers of VSC-DTC-SVM monitored induction motor drive in a wide speed range and even in the presence of parameters uncertainties and mismatching disturbances. Better estimations of the stator resistance, the rotor resistance, and the mutual inductance yield improvements of induction motor performances using VSC-DTC-SVM, thereby facilitating torque ripple minimization. Simulation results verified the performances of the proposed approach.

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Two approaches for direct torque control using a three-level voltage source inverter

Cited by 2 publications

References 5 publications

Potentialities of DTC strategies in position regulation: application to robotics

Potentialities of DTC strategies in position regulation: application to robotics

Performance Analysis of DTC-SVM Sliding Mode Controllers-Based Parameters Estimator of Electric Motor Speed Drive

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