Fast calculation of harmonic torque pulsations in a VSI/induction motor drive

Abdulrahman, Shakir M.; Kettleborough, J.G.; Smith, I.R.

doi:10.1109/41.245893

Cited by 18 publications

(13 citation statements)

References 9 publications

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“…These three signals are shifted by 2π 3 from each other so that each one is associated with one phase on the output side of the 3φ inverter. The inverter operation can be modeled using the non-uniform recurrent sampling-reconstruction approach [6]. Using this approach, the inverter output voltage can be represented by sets of interpolating functions as the following:…”

Section: Three-phase Voltage-source Wavelet-modulated Invertersmentioning

confidence: 99%

“…Among them are the traditional proportional-integral (PI) controllers, neural-networks, fuzzy logic, genetic algorithms, etc. [1][2][3][4][5][6][7]. These IM drives have shown good performance in terms of dynamic responses to load changes.…”

Section: Introductionmentioning

confidence: 95%

“…Torque pulsation can cause adverse effects in overstressing the rotor shaft and in producing mechanical resonances and speed oscillations. The fast and reliable prediction of these pulsations is clearly important during the development of the inverter switching strategies, and when assessing the overall performance of IM drives [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The major drawback of this modulation process is that these trains of ONswitching pulses contain undesired harmonic components that appear on the output side of modulated inverters. These harmonic components can lower the quality of inverter outputs and affect the magnitude of the desired output frequency components due the energy distribution in them [6,7]. One of the most popular carrier-based modulation techniques is the pulse width modulation (PWM) technique.…”

Section: Introductionmentioning

confidence: 99%

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Development and Experimental Testing of a 3o Resolution-Level Controlled WM Inverter-Fed Induction Motor

Saleh¹,

Rahman²

2007

2007 IEEE Industry Applications Annual Meeting

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This paper presents a novel speed control approach for inverter-fed three-phase (3φ) induction motors. The proposed approach is called the resolution-level controller (RLC) that is realized for the 3φ voltage-source (VS) wavelet-modulated (WM) inverters. The wavelet modulation technique generates switching pulses using a non-dyadic type multiresolution analysis (MRA) that is constructed by three scale-based linearly-combined scaling functions shifted by 2π 3 • from each other. Moreover, The change in the scale of the three synthesis scaling functions is based on the change of the sign of the first derivative of the reference-modulating signals. The three scaling functions have dual synthesis scaling functions that are responsible for reconstructing the three continuous-time reference-modulating signals from their nonuniform recurrent samples. The reconstruction processes are carried out by the three synthesis scaling functions to achieve 180-degrees conduction mode of the 3φ inverter. The proposed RLC approach is based on adjusting the zero-crossing locations of the first derivative of the reference-modulating signals to change scales of successive dilated and shifted versions of the three synthesis scaling functions. This change in scales can be incorporated to adjust the speed of the induction motor to meet load changes. The complete drive incorporating the RLC is successfully implemented in real-time using a digital signal processor board dSP ACE ds1102 DSP board to generate switching pulses to activate the inverter six IGBT switches. The IGBT inverter supplies a 1 hp, 1750 RPM, 208 V, 60 Hz, Y -connected 3φ squirrel-cage induction motor that is tested for several speed and load variations. The test results demonstrate robust performance, simple implementation, significant dynamic responses and high ability to maintain high quality outputs.

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Section: Three-phase Voltage-source Wavelet-modulated Invertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development and Experimental Testing of a 3o Resolution-Level Controlled WM Inverter-Fed Induction Motor

Saleh¹,

Rahman²

2007

2007 IEEE Industry Applications Annual Meeting

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“…In previous studies, considerable attention has been given to calculating sixth-harmonic torque pulsations caused by balanced three-phase nonsinusoidal excitation. This type of pulsating torque [6] is principally produced by interactions between the fundamental electromagnetic flux and the fifth and seventh harmonic currents. A method of predicting the sixth-harmonic electromagnetic torque of an induction motor caused by excitation with six-step voltage waveforms was presented in [7].…”

Section: Introductionmentioning

confidence: 99%

Closed-form analysis of adjustable-speed drive performance under input-voltage unbalance and sag conditions

Lee

Jahns

Berkopec

et al. 2006

IEEE Trans. on Ind. Applicat.

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Abstract-Voltage unbalance or sag conditions generated by the line excitation can cause the input rectifier stage of an adjustable-speed drive (ASD) to enter single-phase rectifier operation. This degradation of the input power quality can have a significant negative impact on the induction-machine performance characteristics. This paper provides an approximate closed-form analysis of the impact of line-voltage sags and unbalance on the induction-machine phase voltages, currents, and torque pulsations for a general-purpose ASD consisting of a three-phase diode bridge rectifier, a dc link, and a pulsewidth modulation (PWM) inverter delivering constant volts-per-hertz excitation. Attention is focused on the impact of the dominant second harmonic of the line frequency, which appears in the dc link voltage during the sag/unbalance conditions, neglecting the impact of the other higher order harmonics. In addition to the closed-form analytical results that assume constant rotor speed, both simulation and experimental results are presented, which confirm the key analytical results, including the dominance of the second harmonic in the resulting torque pulsations. The analytical results can be used as a valuable design tool to rapidly evaluate the approximate impact of unbalance/sag conditions on ASD machine performance.Index Terms-Adjustable-speed drives (ASDs), input-voltage sag and unbalance, power quality, torque pulsation.

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Real-time tracking of the torsional vibration of an induction motor supplied by distorted voltage sources

Wang

Chen

2001

Electric Power Systems Research

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Fast calculation of harmonic torque pulsations in a VSI/induction motor drive

Cited by 18 publications

References 9 publications

Development and Experimental Testing of a 3o Resolution-Level Controlled WM Inverter-Fed Induction Motor

Development and Experimental Testing of a 3o Resolution-Level Controlled WM Inverter-Fed Induction Motor

Closed-form analysis of adjustable-speed drive performance under input-voltage unbalance and sag conditions

Real-time tracking of the torsional vibration of an induction motor supplied by distorted voltage sources

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