A Power-Quality Index to Assess the Impact of Voltage Harmonic Distortions and Unbalance to Three-Phase Induction Motors

Duarte, Sérgio; Kagan, Nelson

doi:10.1109/tpwrd.2010.2044665

Cited by 45 publications

(26 citation statements)

References 5 publications

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“…Two of the more prominent harmonics found in a typical networks are the fifth and seventh harmonics. It should be mentioned that, large motors supplied from ASDs are usually provided with harmonic filters to prevent motor damage due to harmonics [6,[8][9][10].…”

Section: B Electrical Motorsmentioning

confidence: 99%

Harmonic study for MDF industries: A case study

Yazdani-Asrami

Sadati

Samadaei

2011

2011 IEEE Applied Power Electronics Colloquium (IAPEC)

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In recent years, with the increase of nonlinear loads drawing Nonsinusoidal currents, power quality distortion has become a serious problem in electrical power systems. Distortions in voltage and current wave-shapes can upset end-use equipment and cause other problems. Harmonics are a particularly common type of distortion that repeats every cycle. Poor power quality may cause many problems, such as the nonlinearity, instability and unbalance of electric network. Also, power quality problem will decrease life time of electrical instrumentation. In this paper, effects of harmonic distortion on the performance of the transformers, cables and induction motors have been studied. Then after theoretical study, harmonic and several power quality indices have been measured in a Medium Density Fiberboard (MDF) factory. The measurements show that harmonic distortion will decrease the life time of transformer and motors and also, will increase the losses and temperature of these equipments.

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Section: B Electrical Motorsmentioning

confidence: 99%

Harmonic study for MDF industries: A case study

Yazdani-Asrami

Sadati

Samadaei

2011

2011 IEEE Applied Power Electronics Colloquium (IAPEC)

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“…Many research achievements have been applied to industry fields. [21][22][23][24] Those investigations mainly cope with electric signal, such as voltage and current, e.g. analyzing the THD of voltage at buses feeding office loads.…”

Section: Introductionmentioning

confidence: 99%

A rotary valve controlled electro-hydraulic vibration exciter

Wang

Gong

Zhou

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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When sinusoidal vibration waveform is required, the frequency bandwidth of conventional electro-hydraulic vibration exciter controlled by servo valve is always limited to a rather narrow range due to the limits of slide valve structure and response speed, and no parameter is available for defining and evaluating the waveform quality. In this paper, a novel electro-hydraulic vibration exciter controlled by electromotor driven rotary valve is proposed to significantly extend the frequency range compared to the conventional servo valve controlled counterpart. Total harmonic distortion (THD) theory which is usually used to cope with voltage and current in electric system is borrowed to evaluate the quality of theoretical and experimental vibration waveforms at different supply pressures and vibration frequencies, quantitatively and qualitatively. The results show that the waveform quality is mainly influenced by the 3rd harmonic resonance. The proposed vibration exciter can output sinusoidal waveform with THD less than 5% at the vibration frequency higher than 70 Hz. In this frequency domain, the supply pressure has an extremely low impact on the THD of the waveform. The amplitude of the waveform can be adjusted by changing the supply pressure with almost no effect to the waveform quality at a certain vibration frequency.

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“…A detailed assessment on the impact of asymmetrical line geometry and unbalanced load on the voltage profiles is developed in [6]: it proposes a new load transposition method for mitigating the voltage unbalance. As explained in [7]- [9], the unbalanced voltage conditions impacts heavily on the motors (heating increase, torque pulsation, and reduction of lifespan). Wind turbines result be affected by unbalanced voltage conditions as well.…”

Section: Introductionmentioning

confidence: 99%