Drive Types and Specifications

Shakweh, Y.

doi:10.1016/b978-0-12-811407-0.00033-7

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…ese imperfections will grow across fracture lines along the direction of the electric field giving water treeing defects. erefore, voltage transients can initiate partial discharge activity at these local defects on account of peak voltage, high dv/dt, and high frequency [4,45,46], which leads to early insulation deterioration. At the same time, mechanical abnormalities in motor operation may arise due to these cumulative transient effects [47].…”

Section: Discussionmentioning

confidence: 99%

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Pannila

Edirisinghe

2021

Journal of Electrical and Computer Engineering

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Electrical equipment and supply cables demand a better quality of supply, with the recent advancements in integrated sensitive solid-state controls. Divergently, proliferated heavy inductive motors and some performance additions based on power electronics have introduced power quality issues to the network. Thus, this study mainly investigates the impact of switching transients generated by electromechanical machines in industrial power systems on insulation deterioration while taking transient overvoltages due to capacitor bank switching also to support. Transients with a high rate of rise are likely to catalyze the degradation of the insulation quality and break down the insulating material through ionization. These steeply passing overvoltage stresses let partial discharges ensue, which can attack the insulation over long service. To unveil this danger, 314 common-mode transient waveforms were measured in the electrical machines of five tea factories in Sri Lanka, in a 50 ms measurement window, taken in 55 measuring attempts. Most of the transients observed are in the form of a damped oscillatory waveform tailed by fast exponential collapse. That correlates to insulation degradation having a very steep rise as 30.04 V/ns, the highest at the withering section. When machines are heavily loaded, situations tend to generate transients with high amplitudes. There were transient bursts that spread as 426.3 ms, while 14 ns fast rise times were recorded from withering motors. Unlike electrical resonance and power-frequency overvoltages, electromagnetic switching transients last even less than 100 ms. To underline this, an analysis of the frequency domain of transients was also presented, which proves high density of high-frequency components reaching 107 kHz range. Accepting the fact that frequency and amplitude are always under the influences of innumerable dynamics, the observational evidence of the study endorses that electrical stress built by the transient nature of the factories reduces the life expectancy of electrical insulation.

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Section: Discussionmentioning

confidence: 99%

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Pannila

Edirisinghe

2021

Journal of Electrical and Computer Engineering

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“…This is because the motor may be operating at a higher speed than necessary for the given load, leading to unnecessary energy consumption. To address this issue, drives are applied to induction motors to enable variable-speed operation [10][11][12][13][14]. By allowing the motor speed to vary according to the load, these drives can significantly improve the energy efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

Simplified V/f Control Algorithm for Reduction of Current Fluctuations in Variable-Speed Operation of Induction Motors

Son,

Kim

2024

Energies

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This paper introduces a straightforward control strategy aimed at the reduction of current fluctuations within the low-frequency domain of open-loop V/f control in induction motor drives. Traditional control techniques necessitate the addition of a current compensator based on motor parameters and the use of digital filters such as band-pass or high-pass filters. These methods, however, rely on precise motor parameters and involve complex filter design and implementation. The proposed control is capable of suppressing current fluctuations without controlling the slip of the induction motor. The proposed control strategy generates the forced rotation angle and command input voltage using the V/f block and outputs the d-axis voltage using a proportional integral controller to keep the d-axis current constant at zero. The difference between the command input voltage and the d-axis voltage is applied as the q-axis voltage and then applied through SVPWM. In order to verify the effectiveness of the proposed control, the proposed control is implemented and analyzed using power simulation based on the results of the analysis of the causes of current fluctuations in the induction motor. Finally, the effect of suppressing current fluctuations of the induction motor is verified through experimental results. In the 10~19 Hz range, where the conventional V/f control method resulted in current fluctuation rates exceeding 10% and peaking at 113.3% at 13 Hz, the proposed method suppressed the fluctuation rate to below 8.6% across all frequencies. This paper validates the effectiveness of the proposed control strategy through these results.

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“…As a result, torque that accelerates the machine is produced. After rotor acceleration, when an equilibrium speed is reached the induced rotor current is sufficient to produce the torque demanded by the load (Shakweh, 2018).…”

Section: Induction Motorsmentioning

confidence: 99%

Paralelización y adaptación a plataformas de cómputo en la nube de algoritmos de mantenimiento y detección de fallos

Gil¹

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Drive Types and Specifications

Cited by 9 publications

References 6 publications

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Simplified V/f Control Algorithm for Reduction of Current Fluctuations in Variable-Speed Operation of Induction Motors

Paralelización y adaptación a plataformas de cómputo en la nube de algoritmos de mantenimiento y detección de fallos

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