Stabilization of sensorless induction motor drives: A survey

Harnefors, Lennart; Hinkkanen, Marko

doi:10.1109/wemdcd.2013.6525178

Cited by 11 publications

(4 citation statements)

References 62 publications

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“…The performance of the proposed method is experimentally verified through the comparison to the voltage based flux estimator which is also implemented in a digital control system. The voltage based estimator is chosen for comparison because of it robustness to the rotor time constant variations [14]. The voltage based estimators are based on the integration of stator back electromotive force (back-emf) which is obtained from the machine parameters and estimated voltages and measured currents [6], [10]:…”

Section: Rotor Flux Estimationmentioning

confidence: 99%

“…They obtain the rotor flux angle and the magnitude in stationary or synchronous reference frame. Furthermore, the proposed methods are mainly built upon two basic flux estimators: voltage flux estimators (VI) based on stator voltage and current vectors and current flux estimators (IW) based on stator current and rotor speed [14]. Current flux estimators are commonly used in high performance drives with a speed sensor since they have internal feedback [8].…”

Section: Introductionmentioning

confidence: 99%

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Rotor flux estimation method for cage induction generators used in wind power applications

Kutija

Sumina

Čolović³

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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This paper describes the rotor flux estimation method for squirrel-cage induction generators (SCIGs) used in wind power applications. The proposed method estimates the rotor flux angle and magnitude in rotor reference frame by using measured stator currents, rotor angle and rotor time constant. The performance of the proposed method is compared to the performance of the voltage based estimator which is commonly used flux estimation method in sensorless field oriented vector control (FOC). The pure integrator in voltage based estimator is replaced by a low-pass filter with adaptive compensation and a phase locked loop (PLL) based position controller. Both methods are implemented in a digital control system and verified on the laboratory model. Experimental setup consists of a squirrel-cage induction machine (560 kW) connected to the grid via back-toback converter and a permanent magnet machine (375 kW) driven by the industrial frequency converter and used as a wind turbine emulator. The advantages and disadvantages of the proposed method are demonstrated by experiments. Keywords-rotor flux estimation; cage induction generator, wind power applications978-1-4799-7800-7/15/$31.00 ©2015 IEEE

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Section: Rotor Flux Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotor flux estimation method for cage induction generators used in wind power applications

Kutija

Sumina

Čolović³

et al. 2015

2015 IEEE International Conference on Industrial Technology (ICIT)

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“…Connecting the IM through sensorless VSD allows control of the rotational speed to provide better dynamic response to any load changes, save energy and use power supply parameters to estimate speed and flux without sensors [8]. However, the closed-loop system induces a level of noise to the current and voltage measurements which masks some characteristics and prevents receipt of clear information [9,10].…”

Section: Introductionmentioning

confidence: 99%

An investigation of electrical motor parameters in a sensorless variable speed drive for machine fault diagnosis

Hamad

Brethee

et al. 2016

2016 22nd International Conference on Automation and Computing (ICAC)

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Abstract-Motor current signature analysis (MCSA) isregarded as an effective technique for motor and its downstream equipment fault diagnostics. However, limited work has been carried out for motors based on a sensorless variable speed drive (VSD). This study focuses on investigation of mechanical fault detection and diagnosis using electrical signatures from a VSD system. An analytic analysis was conducted to show that the fault can induce sidebands in instantaneous current, voltage and power signals in the VSD system, rather than just the sideband in a drive without closed loop control. Then different degrees of tooth breakages in an industrial two-stage helical gearbox were experimentally studied. It has found that even though the measured signal is very noisy, common spectrum analysis can discriminate the small sidebands for the fault detection and diagnosis. However, it has found that the power signals resulted from the multiplication of the current and voltage can provide a better diagnostic result.

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“…Since all machine states and outputs needed for the flux and torque control feedback are calculated by using the estimated flux vector, the performance of vector controlled induction machines depends greatly on the accuracy of the estimated flux [5][6][7]. Furthermore, the risk of degraded performance and instability due to the incorrect flux estimation increases tremendously if sensorless control is used [8]. What complicates the sensorless control is the difficulty of accurately estimating the rotor flux without speed measurement.…”

Section: Introductionmentioning

confidence: 99%

PLL-based Rotor Flux Estimation Method for Sensorless Vector Controlled Squirrel-Cage Induction Generators

Kutija

Sumina

Čolović³

2016

Automatika

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Original scientific paperThis paper presents a new rotor flux estimation method for sensorless vector controlled squirrel-cage induction generators used in wind power applications. The proposed method is based on a phase-locked loop (PLL) and the orthogonality between the rotor flux space vector and its back electromotive force (EMF) space vector. Rotor flux is estimated using stator voltage equations without integrating the back EMF components in the stationary reference frame and the well-known difficulties with the implementation of pure integrators are thus avoided. Moreover, the proposed method ensures successful magnetization of a speed-sensorless squirrel-cage induction generator at nonzero speeds which makes it suitable for wind power applications. Experimental results on a 560 kW squirrel-cage induction generator are presented to confirm the effectiveness and the feasibility of the proposed method.Key words: Induction generator, Flux estimation, Phase locked loop (PLL), Sensorless control, Vector control, Wind power generation Metoda za estimaciju magnetskog toka rotora kaveznih asinkronih generatora bez mjernogčlana brzine vrtnje temeljena na fazno spregnutoj petlji. U radu je predstavljena nova metoda za estimaciju magnetskog toka rotora vektorski upravljanih kaveznih asinkronih vjetrogeneratora. Predložena metoda se temelji na fazno spregnutoj petlji i ortogonalnosti izmeu prostornog vektora magnetskog toka rotora i njemu pripadajućeg prostornog vektora induciranog napona. Magnetski tok rotora se estimira korištenjem naponskih jednadžbi statora u koordinatnom sustavu statora bez integracije komponenti induciranog naponačime su izbjegnuti dobro poznati problemi implementacije integratora. Osim toga, predložena metoda omogućava uspješno magnetiziranje pri vrtnji kaveznog asinkronog generatora bez mjernogčlana brzine vrtnje pa je pogodna za primjenu na vjetrogeneratorima. U radu su prikazani eksperimentalni rezultati za kavezni asinkroni generator snage 560 kW koji potvruju izvedivost i učinkovitost predložene metode.Ključne riječi: asinkroni generator, estimacija magnetskog toka, fazno spregnuta petlja, bezsenzorsko upravljanje, vektorsko upravljanje, proizvodnja električne energije iz vjetra

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Stabilization of sensorless induction motor drives: A survey

Cited by 11 publications

References 62 publications

Rotor flux estimation method for cage induction generators used in wind power applications

Rotor flux estimation method for cage induction generators used in wind power applications

An investigation of electrical motor parameters in a sensorless variable speed drive for machine fault diagnosis

PLL-based Rotor Flux Estimation Method for Sensorless Vector Controlled Squirrel-Cage Induction Generators

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