Effects of voltage unbalance on induction motors

Siddique, Aftab; Yadava, G.S.; Singh, Bhim

doi:10.1109/elinsl.2004.1380430

Cited by 74 publications

(47 citation statements)

References 6 publications

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“…Therefore, the magnitude of temperature rise depends not only on the thermal parameters of the DFIG stator winding, but also on the wind speed profile, including the scale and cycle of the wind speed change. (9) Even with the same voltage unbalance factor [15], there could be a single phase, two-phase or three-phase voltage unbalance. Here a three-phase voltage unbalance with 10% PVUR and a two-phase unbalance with 5% PVUR (b & c phases) are injected in the DFIG model to examine the corresponding thermal behaviors.…”

Section: Thermodynamics Of Dfigs In Wind Turbinesmentioning

confidence: 99%

An Electro-Thermal Analysis of a Variable-Speed Doubly-Fed Induction Generator in a Wind Turbine

et al. 2015

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This paper focuses on the electro-thermal analysis of a doubly-fed induction generator (DFIG) in a wind turbine (WT) with gear transmission configuration. The study of the thermal mechanism plays an important role in the development of cost-effective fault diagnostic techniques, design for reliability and premature failure prevention. Starting from an analysis of the DFIG system control and its power losses mechanism, a model that synthesizes the thermal mechanism of the DFIG and a WT system principle is developed to study the thermodynamics of generator stator winding. The transient-state and steady-state temperature characteristics of stator winding under constant and step-cycle patterns of wind speed are studied to show an intrinsic thermal process within a variable-speed WT generator. Thermal behaviors of two failure modes, i.e., generator ventilation system failure and generator stator winding under electric voltage unbalance, are examined in details and validated by both simulation and data analysis. The effective approach presented in this paper for generator fault diagnosis using the acquired SCADA data shows the importance of simulation models in providing guidance for post-data analysis and interpretation. WT generator winding lifetime is finally estimated based on a thermal ageing model to investigate the impacts of wind speed and failure mode. OPEN ACCESSEnergies 2015, 8 3387

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Section: Thermodynamics Of Dfigs In Wind Turbinesmentioning

confidence: 99%

An Electro-Thermal Analysis of a Variable-Speed Doubly-Fed Induction Generator in a Wind Turbine

et al. 2015

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“…Thus, voltage unbalance is due to several causes, such as (Moussa et al, 2010;Siddique et al, 2004):…”

Section: Introductionmentioning

confidence: 99%

“…• Single phase, two-phase or three-phase undervoltage unbalance • Single phase, two-phase or three-phase overvoltage unbalance • Unequal single phase angle or two phase angles displacement • One phase load nearby the motor • Unbalanced distribution of single-phase loads on the power system • Single-phase to ground defaults These induction motor functioning conditions may lead to many damages and performance reduction of the motor (Moussa et al, 2010;Chatchanayuenyong, 2009;Tallam et al, 2007;Siddique et al, 2004) which are:…”

Section: Introductionmentioning

confidence: 99%

Multiresolution Analysis Based Effective Diagnosis of Induction Motors

Sethom¹,

Ghedamsi²

2012

American Journal of Applied Sciences

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Problem statement: Effective detection and localization of unbalance voltage supply affecting an induction motor may be compromised in presence of additionnal noise. Approach: In order to overcome the non possibility of the default detection and localization in presence of noise, the use of the discrete wavelet transform and especially the MultiResolution Analysis algorithm, to remove efficiently the noise associated to the stator currents is proposed. Results: Simulation results show that the de-noised stator current is a good estimation of the non disturbed one. They show also that the default occurrence instant can be well detected starting from high frequency detail signal. Furthermore, the signal details which characterize the default are not smoothed and still characterize the default occurrence. Experimental results validate the de-noising approach efficiency and the effective unbalance detection considering the MRA technique. Conclusion: In this study, current signal denoising problem is studied in order to perform an effective detection of an unbalance voltage supply induction machine default. It can be deduced that the wavelet transform and particularly the MRA technique is a good and powerful solution for both non linear noise filtering and transient default detection. Both simulation and experimental results show clearly that the stator currents MRA allows not only to detect when the default appears but also helps to separate the useful signal from noise without affecting or suppressing the default transient information.

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“…Due to poor PQ, billions of dollars are being wasted every year. Voltage unbalance exist due to the incomplete transposition of transmission line, unbalance load, open delta transformer connection, uneven distribution of single phase load [1][2][3][4][5][6] is now considered as the one of the most important aspect of PQ disturbances. Based on ANSI report presented in [3], the 32 % of the USA electrical distribution system have degree of voltage unbalance lies between 1 and 3 % whereas 2 % of distribution system have degree of unbalance more than 3 %.…”

Section: Introductionmentioning

confidence: 99%

Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

Singh¹,

Singh²

2013

Journal of Electrical Engineering

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This paper presents precise assessment of steady-state performance of induction motor (IM) operating under voltage unbalance. The variation of two voltage unbalance factors viz. complex voltage unbalance factor (CVUF) and impedance unbalance factor (IUF) with positive sequence voltage component, reveals that degree and manner of unbalance in supply voltage is exactly reflected in CVUF and IUF, respectively. On this basis, it is shown that for the precise assessment of IM performance, knowledge of both, manner (IUF) and degree (CVUF) of unbalance is important. Further, effect of angle of unbalance, on the performance of the IM and voltage pattern is analyzed. Results depict high sensitivity of derating factor and peak copper losses to this angle. Thus, it should be included along with unbalance factors for the precise and complete performance assessment of IM.

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Effects of voltage unbalance on induction motors

Cited by 74 publications

References 6 publications

An Electro-Thermal Analysis of a Variable-Speed Doubly-Fed Induction Generator in a Wind Turbine

An Electro-Thermal Analysis of a Variable-Speed Doubly-Fed Induction Generator in a Wind Turbine

Multiresolution Analysis Based Effective Diagnosis of Induction Motors

Precise Assessment of Performance of Induction Motor under Supply Imbalance Through Impedance Unbalance Factor

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