Sensitivity of AC adjustable speed drives to voltage sags and short interruptions

Djokić, Saša Ž.; Stockman, Kurt; Milanović, Jovica V.; Desmet, Jan; Belmans, Ronnie

doi:10.1109/tpwrd.2004.832353

Cited by 123 publications

(15 citation statements)

References 16 publications

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“…Many publications (e.g., [21][22][23][24][25][26][27][28][29][30][31]) focused on laboratory tests describing sensitivity characteristics of different sensitive equipment depend on equipment type, loading of equipment and power system conditions. All of them consider that sensitive equipment have more or less rectangular characteristics.…”

Section: Inclusion An Uncertainty Of Sensitive Equipmentmentioning

confidence: 99%

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Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags

Otcenasova

Bodnar²,

Regula

et al. 2017

Energies

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This article deals with the assessment of the reliability of sensitive equipment due to voltage sags. The most frequent problems of power quality are voltage sags. Equipment that cannot withstand short-term voltage sag is defined as sensitive device. Sensitivity of such equipment can be described by the voltage-tolerance curves. A device (generator) to generate voltage sags (also interruptions) with duration at least 1 ms has been designed and developed for this purpose. Equipment sensitive to voltage sags was tested using this generator. Overall, five types of sensitive equipment were tested: personal computers, fluorescent lamps, drives with speed control, programmable logic controllers, and contactors. The measured sensitivity curves of these devices have been used to determine the number of trips (failures) due to voltage sags. Two probabilistic methods (general probability method and cumulative probability method) to determine probability of equipment failure occurrence are used. These methods were applied to real node in the distribution system with its actual performance of voltage sags/swells. The calculations also contain different levels of sensitivity of the sensitive equipment.

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Section: Inclusion An Uncertainty Of Sensitive Equipmentmentioning

confidence: 99%

“…Due to difficulty of PLC measuring and testing, results were taken from the research institute study [32]. 2 Due to complexity of measuring voltage-tolerance curves, results were taken from comprehensive study results [22]. Table 2.…”

Section: Inclusion An Uncertainty Of Sensitive Equipmentmentioning

confidence: 99%

Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags

Otcenasova

Bodnar²,

Regula

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…The proper operation of modern industries relies on electronic controls and equipment which are often susceptible to voltage dips [5] [6] [7] [8] [9]. The response of industrial processes to incoming voltage dips is directly influenced by the voltage dip ride-through capability of equipment that make up the process.…”

Section: Review Of Existing Standards and Previous Workmentioning

confidence: 99%

“…The IEC 61000-4-11/34 standards [12] [13] specify different immunity classes of devices against voltage dips based on testing and measurements. However, different types of equipment exhibit different sensitivities to voltage dips [5] [6] [7] [8] [9]. Besides, different brands of the same equipment type, and even different models of the same equipment brand often have different sensitivity curves.…”

Section: Review Of Existing Standards and Previous Workmentioning

confidence: 99%

Cost Estimation of Voltage Dips in Small Industries Based on Equipment Sensitivity Analysis

Weldemariam¹,

Ćuk²,

Cobben³

2016

SGRE

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Voltage dip is one of the detrimental power quality problems that can lead to huge financial losses in industries. Its economic impact is not only associated with the quality of the supply but also with sensitivity of electronic controls and equipment of the industry which are susceptible to voltage dips. Mitigating solutions are available but the choice depends on the careful assessment of the economic impact of voltage dips and economic gains of solutions. This paper presents an approach for estimating the economic cost of voltage dips based on sensitivity analysis. The voltage-tolerance curves of the sensitive equipment are obtained from experimental tests under different conditions. From the behavior and interaction of process equipment, different failure modes and economic sensitivity density are determined for different types of voltage dips. Voltage events monitored in the MV-network for several years are assessed to determine the frequency and severity of voltage dips at the customer terminal. The economic values of equipment and processes are assessed to get insight into alternative solutions with more rewarding measures. Then, cost-benefit analysis is performed to compare the economic gains of solutions protecting equipment or processes showing more rewarding economic values.

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“…Basic voltage sag characteristics regarding equipment immunity evaluation are sag type, duration, remaining voltage magnitude, and phase angle jump. Depending on the equipment under test (EUT), other parameters involved, including point-on-wave of dip initiation and ending [7], rate of voltage change, and dip shape [8], are of great importance.…”

Section: Introductionmentioning

confidence: 99%

An Improved Scheme for Voltage Sag Override in Direct Torque Controlled Induction Motor Drives

et al. 2017

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This paper analyses symmetrical and unsymmetrical voltage sag effects on the torque and speed deviation in direct torque controlled (DTC) induction motors (IMs) for adjustable speed drives (ASDs). The capability of an ASD for continuous normal operation in case of short supply disturbances is essential for high performance drives. In this paper, an updated scheme is proposed for boosting ASD performances during supply disturbances with voltage reduction. Flux weakening is an effective method to overcome the torque-decreasing problem in case of DC-link voltage diminishing. It is also shown that speed reduction is an efficient procedure to obtain the voltage sag insensitivity of an ASD, which is appropriate for the existing industrial applications. Extensive laboratory testing has been conducted to verify the performances and effectiveness of the proposed control algorithm. The suggested method requires only a modification of converter control software or operating speed change without any additional hardware components. Extended tests under various voltage sags events were carried out on a 1.5 kW laboratory drive, and the obtained results have been compared with an industrial DTC drive.

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Sensitivity of AC adjustable speed drives to voltage sags and short interruptions

Cited by 123 publications

References 16 publications

Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags

Methodology for Determination of the Number of Equipment Malfunctions Due to Voltage Sags

Cost Estimation of Voltage Dips in Small Industries Based on Equipment Sensitivity Analysis

An Improved Scheme for Voltage Sag Override in Direct Torque Controlled Induction Motor Drives

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