A Modified Multiband Hysteresis Controlled DTC of Induction Machine with 27-level asymmetrical CHB-MLI with NVC modulation

Jonnala, Rohith Balaji; Babu, Ch. Sai

doi:10.1016/j.asej.2015.08.007

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…However, calculation of reference voltage space vectors is required and complex to solve. Another technique namely adjustable hysteresis band presented in [47], [55], [56], enables the reduction of the hysteresis band size resulting in accurate torque regulation, particularly when the pre-set sampling time is small. However, in practice, dSPACE-based DTC operates at a minimum sample rate of 50μs, which may cause the torque to travel between the upper and lower band vigorously, resulting in overshoot and undershoot.…”

Section: Introductionmentioning

confidence: 99%

Torque ripple minimization in direct torque control at low-speed operation using alternate switching technique

Aihsan

Jidin

Alias

et al. 2022

IJPEDS

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Direct torque control (DTC) of induction motor is prominent to offer instant torque and flux control with a simple control structure. However, this scheme suffers from two major drawbacks namely high torque ripple and variable switching frequency of the inverter, especially during low-speed operation. During the low-speed condition, the positive torque slope is very steep and torque overshoot occurs frequently resulting in the torque ripple become of great significance. This paper proposes a new and effective technique to reduce the torque ripple by integrating the alternate switching technique to the inverter switching status to limit the torque slope surge. By varying the frequency and duty cycle of the alternate switching, the rate of surge can be controlled resulting in the chances of overshoots, and selection of reverse voltage vector can be avoided. The feasibility of the proposed technique has been validated using MATLAB/Simulink software and through experimental results. The results show the proposed alternate switching technique minimizes over 40% reduction in the torque ripple while maintaining the simple structure of DTC.

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Section: Introductionmentioning

confidence: 99%

Torque ripple minimization in direct torque control at low-speed operation using alternate switching technique

Aihsan

Jidin

Alias

et al. 2022

IJPEDS

View full text Add to dashboard Cite

show abstract

“…Then, the estimated values of the electromagnetic torque Test and the stator flux ψ est are compared respectively to their reference values T em* and ψ s* , the results of the comparison form the inputs of the hysteresis comparators [48]. The selection of the appropriate voltage vector is based on the control table [10] ( Table 1).…”

Section: Direct Torque Controlmentioning

confidence: 99%

Modern improvement techniques of direct torque control for induction motor drives - a review

Ouanjli¹,

Derouich²,

Ghzizal³

et al. 2019

Prot Control Mod Power Syst

105

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Conventional direct torque control (DTC) is one of the excellent control strategies available to control the torque of the induction machine (IM). However, the low switching frequency of the DTC causes high ripples in the flux and torque that leads to an acoustic noise which degrades the control performances, especially at low speeds. Many direct torque control techniques were appeared to remedy these problems by focusing specifically on the torque and flux. In this paper, a state of the art review of various modern techniques for improving the performance of DTC control is presented. The objective is to make a critical analysis of these methods in terms of ripples reduction, tracking speed, switching loss, algorithm complexity and parameter sensitivity. Further, it is envisaged that the information presented in this review paper will be a valuable gathering of information for academic and industrial researchers.

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“…The major inconvenience of this control strategy is high ripples in torque and flux due to the use of the hysteresis regulators for stator flux and electromagnetic torque regulation 15 , 42 . The multilevel converters are used for minimizing the ripples but the efficiency is reduced due to the number of power switches 16 . Several authors have used Space Vector Modulation (SWM) 17 , Sliding mode control (SMC) 18 , this technique is robust but the undesirable chattering effect is appeared 19 .…”

Section: Introductionmentioning

confidence: 99%

Design and processor in the loop implementation of an improved control for IM driven solar PV fed water pumping system

Errouha

Combe

Motahhir³

et al. 2022

Sci Rep

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In recent years, the improvement of photovoltaic water pumping system (PVWPS) efficiency takes the considerable interest of researchers due to its operating based on cleaner electrical energy production. In this paper, a new approach based on fuzzy logic controller incorporating loss minimization technique applied to the induction machine (IM) is developed for PVWPS applications. The proposed control selects the optimal flux magnitude by minimization of the IM losses. Moreover, Variable step size perturb and observe method is introduced. The suitability of the proposed control is approved by reducing the absorbed current; therefore, the motor losses are minimized and the efficiency is improved. The proposed control strategy is compared with the method without losses minimization. The comparison results illustrate the effectiveness of the proposed method based on losses minimization regarding the electrical speed, absorbed current, flow water and developed flux. A processor-in-the-loop (PIL) test is effectuated as an experimental test of the proposed method. It consists in implementing the generated C code on the STM32F4 discovery board. The obtained results from the embedded board are similar to numerical simulation results.

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A Modified Multiband Hysteresis Controlled DTC of Induction Machine with 27-level asymmetrical CHB-MLI with NVC modulation

Cited by 10 publications

References 18 publications

Torque ripple minimization in direct torque control at low-speed operation using alternate switching technique

Torque ripple minimization in direct torque control at low-speed operation using alternate switching technique

Modern improvement techniques of direct torque control for induction motor drives - a review

Design and processor in the loop implementation of an improved control for IM driven solar PV fed water pumping system

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