A wide-speed high torque capability utilizing overmodulation strategy in DTC of induction machines with constant switching frequency controller

Jidin, Auzani; Basar, Mohd Farriz; Noordin, Aminurrashid; Idris, Nik Rumzi Nik; Yatim, A.H.M.

doi:10.1109/peds.2009.5385847

Cited by 14 publications

(26 citation statements)

References 28 publications

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“…Experiments are conducted on the two control algorithm with motor speeds from 0 to 500 rad/s. The reference algorithms are listed below: 1) DTC3: the multi-flux trajectory control mode and the traditional field-weakening control algorithm of the open loop power [23].…”

Section: Resultsmentioning

confidence: 99%

“…However, it is not verified by the square wave modulation algorithm. In reference [23], an over-modulation strategy is put forward based on traditional flux regulation methods for the purpose of expanding the constant torque region and improving the steady-state torque performance. However, the dynamic process neglects torque control and synchronous pulse-width modulation (PWM) modulation is used rather than square wave modulation returns in the steady state.…”

Section: Introductionmentioning

confidence: 99%

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A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors

Van-Tien¹,

Zheng²,

Yang³

et al. 2016

Journal of Power Electronics

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In view of the speed control characteristics of induction traction motors and the problems of direct torque control (DTC) algorithms in current applications, this paper presents a DTC algorithm characterized by a symmetrical polygon flux control and a closed loop power control in the constant-torque base speed region and constant-power field-weakening region of induction traction motors. This algorithm only needs to add a stator flux control algorithm to the traditional DTC structures. This has the benefit of simplicity, while maintaining the features of traditional algorithms such as a rapid dynamic response, uncomplicated control circuit, reduced dependence on motor parameters, etc. In addition, it obtains a smoother flux trajectory that is conducive to improvement of the harmonic elimination capability, the switching frequency utilization as well as the torque and power performance in the field-weakening region. The effectiveness and feasibility of this DTC algorithm are demonstrated by both theoretical analysis and experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors

Van-Tien¹,

Zheng²,

Yang³

et al. 2016

Journal of Power Electronics

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“…The main reason for its popularity is due to its simple structure, robustness against rotor parameter variations, and quick dynamic response [2]. When compared with the field-oriented control (FOC) scheme, DTC does not need the complex field orientation block, speed encoder, and current regulator.…”

Section: Introductionmentioning

confidence: 99%

“…The well-known major problems that are normally associated with DTC utilizing hysteresis torque controller (which will be referred to as DTC-HC in this paper) are (1) poor stator flux regulation at low speed operation, also referred as flux droop [5], (2) high torque ripples [6][7][8], and (3) variable switching frequency [9][10][11]. Problems (2) and (3) have been addressed by various researchers and as a result several variations to the basic DTC structure have been proposed over the past few decades; among the widely accepted methods are the ones which are based on space vector modulation -known as the DTC-SVM.…”

Section: Introductionmentioning

confidence: 99%

Simple Flux Regulation for Improving State Estimation at Very Low and Zero Speed of a Speed Sensorless Direct Torque Control of an Induction Motor

Alsofyani

Idris

2016

IEEE Trans. Power Electron.

118

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This paper presents a simple flux regulation for a direct torque control (DTC) of induction motor (IM), to improve speed and torque estimations at low and zero speed regions. To accomplish this, a constant switching frequency controller (CSFC) is used to replace the3-level hysteresis torque comparator of a DTC IM. The DTC of IM utilizing CSFC (DTC-CSFC) retains the simple structure of a look-up table based DTC drive. With DTC-CSFC, constant switching frequency is maintained, and at the same, the flux droop problem that normally occurs in DTC with the hysteresis controller (DTC-HC) at low speed is solved; subsequently, the stator flux and torque estimations at low speed are also improved. In the proposed system, the speed feedback for the closed loop speed control is estimated using an extended Kalman filter (EKF), which requires heavy real-time computation. However, due to the simple structure of DTC-CSFC, small sampling time, hence large control bandwidth is possible. The performance of the speed sensorless DTC-HC and DTC-CSFC are compared experimentally under different operating conditions. With the improved stator flux regulation, experimental results of the DTC-CSFC showed a significant improvement in speed and torque estimations at very low and zero frequency operations. Index Terms-Constant switching frequency controller, direct torque control, extended Kalman filter, flux regulation, induction motor.S 0885-8993 (c)

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“…The margin is obtained by reducing the flux and/or using over modulation, but with lowering the flux under the optimal level or producing harmonics. If the flux reference is given in inverse proportion to the shaft speed, the torque dynamics is than dependent both on the current regulator dynamics and mechanical time constant [12][13][14][15]. The absence of an explicit current controller in DTC scheme insures better DC bus utilization then in FOC [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Improved Torque Control of High Speed Shaft-Sensorless Induction Motor Drive

et al. 2015

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Original scientific paperThis paper presents improved torque control scheme for a high speed sensorless induction motor drive. The proposed high speed torque control scheme substitutes the flux oriented control by the voltage angle control in the flux weakening regime. This scheme uses maximum of available inverter voltage, alleviates well known problems of current control schemes in conditions with insufficient voltage margin and avoids the influence of estimated speed error to the achieved flux level. The algorithm uses similar slip control as flux oriented control algorithm, but is applied without an outer flux trajectory reference which is typical for the flux weakening, providing a fast and well damped torque response even if error in estimated speed is present.Experiments confirm the effectiveness of proposed torque control algorithm, smooth transition from the flux oriented control in the base speed region to the voltage angle control in the flux weakening, superior dynamic performance of the voltage angle torque control, and its robustness to an estimated rotor speed error. Key words: High Speed Induction Motor, Toque Control, Voltage Angle ControlUnaprijeeno upravljanje momentom visokobrzinskog pogona s asinkronim motorom bez mjerenja brzine. U radu je predstavljena unaprijeena shema upravljanja za pogon visokobrzinskog asinkronog motora bez mjerenja brzine. Predloženi postupak zamjenjuje vektorsko upravljanje upravljačkom strukturom s upravljanjem kutom napona u slabljenju polja. Predložena shema koristi maksimalni raspoloživi napon invertora, eliminira dobro poznate probleme strujno reguliranih pogona u uvjetima s nedovoljnom rezervom napona i eliminira utjecaj greške u estimaciji brzine na dostignutu razinu toka. Algoritam koristi sličnu kontrolu klizanja kao i vektorsko upravljanje, ali bez tipičnog vanjskog zadavanja toka u slabljenju polja, pružajući brz i dobro prigušen odziv momentǎ cak i u slučaju greške u estimaciji brzine.Eksperimenti izvedeni na velikoj brzini vrtnje potvruju učinkovitost predložene regulacije momenta, gladak prijelaz iz baznog područja brzine u slabljenje polja, vrhunske dinamičke performanse upravljanja kutom napona i robusnost na pogrešku u estimiranoj brzini vrtnje.

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A wide-speed high torque capability utilizing overmodulation strategy in DTC of induction machines with constant switching frequency controller

Cited by 14 publications

References 28 publications

A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors

A DTC Stator Flux Algorithm for the Performance Improvement of Induction Traction Motors

Simple Flux Regulation for Improving State Estimation at Very Low and Zero Speed of a Speed Sensorless Direct Torque Control of an Induction Motor

Improved Torque Control of High Speed Shaft-Sensorless Induction Motor Drive

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