Direct Torque Control of Induction Machines With Constant Switching Frequency and Reduced Torque Ripple

Idris, Nik Rumzi Nik; Yatim, A.H.M.

doi:10.1109/tie.2004.831718

Cited by 234 publications

(118 citation statements)

References 14 publications

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“…In (16), it is assumes that the zero voltage vectors are selected in order to reduce the torque. The instantaneous stator flux frequency can be obtained in terms of the average synchronous frequency and duty ratio [38]. Therefore (15) and (16) In (17) and (18), it is assumed that the q components of the particular voltage vector are zero and the stator and rotor fluxes are constant which means that the voltage vectors are tangential to the circular stator flux locus.…”

Section: Structure and Modeling Of The Dtc With Constant Switching Frmentioning

confidence: 99%

“…It shows some significant improvements, however the power devices switching frequency are varies and the torque and flux ripple can still be considered as high. A PI-constant switching frequency (PI-CSF) torque controller for DTC was initially introduced in [37,38]. The PI-CSF torque controller was replacing the conventional hysteresis controller while maintaining the use of lookup-table.…”

Section: Introductionmentioning

confidence: 99%

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Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

Nordin

Azli

Idris

et al. 2016

IJPEDS

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Direct Torque Control using multilevel inverter (DTC-MLI) with hysteresis controller suffers from high torque and flux ripple and variable switching frequency. In this paper, a constant frequency torque controller is proposed to enhance the DTC-MLI performance. The operational concepts of the constant switching frequency torque controller of a DTC-MLI system followed by the simulation results and analysis are presented. The proposed system significantly improves the DTC drive in terms of dynamic performance, smaller torque and flux ripple, and retains a constant switching frequency. Keyword:Constant INTRODUCTIONSince it has been introduced in early 1980s [1], Direct Torque Control (DTC) has gained its popularity in electrical drives research area. Recently, the application of high-power medium voltage in AC drives has shown rapid development. Thus, the use of multilevel inverters in DTC scheme has become an important structure for further development and improvement. Numerous technical papers have shown a superior performance of DTC scheme using multilevel inverters .By utilizing the multilevel inverter in DTC scheme, the choices of voltage vectors that can be used to control the torque and flux are increased. As a result, more precise control can be obtained. Several control method have been proposed for DTC scheme using multilevel inverter (DTC-MLI); hysteresis-based and non-hysteresis-based such as predictive control strategy [11,15,17,18,20,22,26,27,30], space vector modulation strategy [2, 4, 8-10, 14, 21, 28, 29, 33] and fuzzy logic control strategy [3,5,7,19,31,[34][35][36].The employment of hysteresis-based control strategy in discrete implementation has led to high torque ripple even with a small hysteresis band. This is due to the delay in sampling time. Besides that, it created a variable switching frequency of the switching devices which leads to an unpredictable harmonics current.As a result, some researchers preferred to use non-hysteresis-based control strategy. Significant improvements are accomplished in terms of flux and torque ripple and devices switching frequency. However it involves a complex mathematical equations and algorithm which has led to the complexity of the DTC-MLI scheme and high computational burden particularly when the multilevel inverter's level is increased.

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Section: Structure and Modeling Of The Dtc With Constant Switching Frmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

Nordin

Azli

Idris

et al. 2016

IJPEDS

View full text Add to dashboard Cite

show abstract

“…Constant flux can provide enough electromagnetic torque and avoid magnetizing current saturation in the iron core of the IM. Therefore in direct torque and flux control, as well as in the proposed direct power and flux controls in the subsequent chapters, the flux is maintained constant [25].…”

Section: Flux Control Principlesmentioning

confidence: 99%

“…Alternatively, (25) can also be represented by Table 1. A whole stator flux cycle of 360º is divided equally into 6 sectors, each one spanning 60º.…”

Section: Switching Tablementioning

confidence: 99%

Fuzzy Logic Based Direct Power Control of Induction Motor Drive

Khoei¹,

Shahraki

2016

Bulletin EEI

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“…These features are needed to improve the drive's technical properties by decreasing speed pulsations and also economical properties by reducing switching frequency which affects power dissipation and inverter efficiency. The main way to improve the DTC method involves the torque pulsation decrease keeping the sampling time t p and transistors switching frequency unchanged [2,3]. Constant switching frequency is useful when passive filters are applied on the inverter output.…”

Section: Introductionmentioning

confidence: 99%

Improved Algorithms of Direct Torque Control Method

Sikorski

Korzeniewski

2013

Automatika

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In the paper a new way of DTC control method analysis to explain flux and current distortion at a low speed of motor operation is discussed. As a result, a new DTC-δ algorithm is proposed. It is important that the DTC-δ algorithm uses the same switching table as the DTC method. The modified DTC algorithms are free from the disadvantages of the conventional DTC method i.e. hexagonal flux and strongly deformed current at a low speed range. The dynamical properties of the new algorithms are similar to the conventional DTC method. The correctness of the proposed methods has been confirmed by laboratory investigations.Key words: Direct torque control (DTC), Induction motor drives, Variable-speed drives Unaprije eni algoritmi za izravno upravljanje momentom. Ovaj se rad bavi novim načinom analize izravnog upravljanja momentom (DTC) radi objašnjenja distorzije toka i struje na malim brzinama vrtnje motora. Kao rezultat, predložen je novi DTC-δ algoritam. Pritom je značajno da novi DTC-δ algoritam koristi istu tablicu prekapčanja kao i DTC metoda. Modificirani DTC algoritmi su bez nedostataka karakterističnih za konvencionalne DTC metode, poput heksagonalnog toka i izrazito izobličene struje pri niskim brzinama. Dinamička svojstva novih algoritama su slična konvencionalnoj DTC metodi. Predložene metode su potvr ene laboratorijskim ispitivanjima.Ključne riječi: izravno upravljanje momentom (DTC), elektromotorni pogoni s kaveznim strojem, pogoni s promjenjivom brzinom vrtnje

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Direct Torque Control of Induction Machines With Constant Switching Frequency and Reduced Torque Ripple

Cited by 234 publications

References 14 publications

Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines

Fuzzy Logic Based Direct Power Control of Induction Motor Drive

Improved Algorithms of Direct Torque Control Method

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