Estimating induction motor efficiency under no-controlled conditions in the presences of unbalanced and harmonics voltages

Sousa, Vladimir; Viego, Percy R.; Gómez, Julio R.; Quispe, Enrique C.; Balbis, Milen

doi:10.1109/chilecon.2015.7400434

Cited by 7 publications

(14 citation statements)

References 16 publications

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“…Since the input power can be measured and the information of the nameplate in general is accessible, this is a low intrusion method [6,26]. Moreover, calculating Pout and Lf, which is rather easy, has low computational demand.…”

Section: Real-time Monitoring Of Energy Efficiency and Load Factormentioning

confidence: 99%

“… Nameplate method [13,14]  Slip method [15,16]  Current method [13,15]  Equivalent circuit method [13,15]  Segregated loss method [13,15]  Torque method [4, 9, 10, 13, 15, 17 -23]  Computer tools [7]  Optimization methods based on heuristic techniques and evolutionary algorithms (HTEA) [6,[24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…voltage unbalance and harmonics), which are expected to increase in the near future with the new modes of producing and consuming electricity, are very significant [36]. Therefore, since IM frequently operates at partial loads, with energy quality issues, which differ from nominal operating conditions, it is essential to consider the influence of the operating conditions on the accuracy when using EEEM [4,6,26]. Overall, EEEMs does not considered the influence of voltage unbalanced, harmonics or the combination of both on the energy efficiency of IMs, which affect their accuracy, as will be further discussed.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the energy efficiency estimation methods on induction motors considering real-time monitoring

et al. 2019

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Different methods have been developed to estimate the energy efficiency of induction motors. The accuracy of these methods vary with the load factor, the unbalanced voltage (UV) and harmonics. The feasibility of these methods for efficiency estimation in real-time were theoretically and experimentally assessed during the operation under different operational conditions (i.e. balanced sinusoidal voltage (BSV), harmonics, UV and harmonics with UV). Results show that for load factors over 80%, the air-gap method is applicable under any condition, while the slip method is only applicable under BSV or balanced harmonic voltage. Moreover, for load factors over 40%, the nameplate method is applicable under BSV. Other methods result in errors over 8% and optimization methods are not applicable for real-time monitoring. Electric systems generally operates with some degree of UV and harmonics, while induction motors mostly operate with load factors below 60%, limiting the use of these methods for real-time measurement.

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Section: Real-time Monitoring Of Energy Efficiency and Load Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of the energy efficiency estimation methods on induction motors considering real-time monitoring

et al. 2019

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“…In addition, they consume approximately 68% of the electric power in this sector [2]. The problems associated with energy quality, constitute an everyday phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…These studies are generally focused on the effects caused by the negative sequence component of voltage. Other authors have considered both the positive and negative sequence voltage [2]- [4], [15]- [17]. This paper presents a new analysis focused in the qualitative and quantitative effects of voltage unbalance on the line currents, losses, efficiency and power factor on induction motors.…”

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confidence: 99%

Unbalanced Voltages Impacts on the Energy Performance of Induction Motors

Quispe

López

Ferreira

et al. 2018

IJECE

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This paper presents the results of a study about the effects of unbalanced voltages on the energy performance of three-phase induction motors. The principal contribution of this paper is that presents a detailed analysis of the influence of positive and negative sequence voltage components and the angle between them on several characteristics such as: line currents, losses, efficiency and power factor under different voltage unbalanced conditions. A three-phase induction motor of 3 HP was used as a case study. The results of the investigation show that the positive sequence voltage must be considered together with the voltage unbalance factor (VUF) or percent voltage unbalance (PVU) index to evaluate the performance of the induction motor. It is also shown that the behavior of the motor load influences on the positive sequence parameters next to the voltage, while in the case of negative sequence only influences the negative sequence voltage. Keyword: Efficiency INTRODUCTIONThe analysis of induction motor operation is important because these represent most of the installed load in industrial systems due to its reliability, power to size ratio, ruggedness and relatively low cost [1]. In addition, they consume approximately 68% of the electric power in this sector [2]. The problems associated with energy quality, constitute an everyday phenomena. Unbalanced voltages, which in most cases occurs associated with voltage deviations, is one of the most common in terms of energy quality and has a direct influence on the increase of losses in electric motors and systems [3].The presence of unbalance is due mainly to the existence of unbalanced loads, unsymmetrical transformer windings or transmission impedances, large single-phase loads, incomplete transposition of transmission lines, open delta transformer connections, blown fuses on three-phase capacitor bank, operation of single-phase loads at different times, defective transformers in power systems, or when one of the threephases of the motor is open [4], [5]. These problems significantly affect the efficiency and other operational characteristics of the induction motors.The operation of induction motor under voltage unbalance conditions produce two rotating fields in the motor air gap, one in the forward direction of the motor rotation (positive sequence) and another in the opposite direction (negative sequence), giving as result an elliptical field [6]. Consequently for a given load and percentage of voltage unbalance, the phase currents and temperature rise much greater than when operating under the same load conditions and balanced voltages, affecting the motor performance.

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Effects of voltage unbalance and harmonics on drive systems with induction motor

Beleiu

Pavel

Birou

et al. 2022

Journal of Taibah University for Science

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Estimating induction motor efficiency under no-controlled conditions in the presences of unbalanced and harmonics voltages

Cited by 7 publications

References 16 publications

Assessment of the energy efficiency estimation methods on induction motors considering real-time monitoring

Assessment of the energy efficiency estimation methods on induction motors considering real-time monitoring

Unbalanced Voltages Impacts on the Energy Performance of Induction Motors

Effects of voltage unbalance and harmonics on drive systems with induction motor

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