Distribution system voltage sags: interaction with motor and drive loads

Tang, Lijun; Lamoree, J.; McGranaghan, Mark; Mehta, H.

doi:10.1109/tdc.1994.328353

Cited by 19 publications

(5 citation statements)

References 5 publications

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“…Voltage sag produced by the starting current of induction motors is one of the main causes of sensitive equipment (SE) dropout, particularly if the motor size is large when compared with the supply short-circuit power [1,2]. The induction-motor starting current is usually considered constant-during the whole starting process-from three to seven times the full-load current, depending on the type of assisted starting used, if any.…”

Section: Introductionmentioning

confidence: 99%

A Study of Voltage Sags Generated by Induction Motor Starting

Gómez

Reineri

Campetelli

et al. 2004

Electric Power Components and Systems

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Voltage sag produced by induction motor starting current is one of the main causes of sensitive equipment (SE) dropout. The use of motor starter reduces the voltage sag depth but increases its duration. The subsequent connection to full voltage originates a new sag separated from the first one by a few seconds. An extensive experimental research that aimed at determining the effect of assisted starting characteristics on the generated voltage sag is reported. Results show the existence of critical combinations of commutation time and assisted starting voltage from the SE dropout susceptibility point-of-view. Voltage drop and consequent specific energy of the assisted starting is compared with values corresponding to both direct on-line starting and direct at-reduced-voltage starting.

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Section: Introductionmentioning

confidence: 99%

A Study of Voltage Sags Generated by Induction Motor Starting

Gómez

Reineri

Campetelli

et al. 2004

Electric Power Components and Systems

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show abstract

“…Given the value of time constant determined by system parameters, the data three cycles after voltage sag is suggested to accurately calculate the fifth harmonic incremental impedance. As the duration of the majority of actual voltage sags last for 4–10 cycles [22, 23], the fifth harmonic zero sequence incremental impedance is feasible to locate single‐phase VSS in the resonant grounded system. Indeed, for the other voltage sags which last for less than one cycle, there is not enough data for the method to get the exact location of VSS.…”

Section: Simulation Analysismentioning

confidence: 99%

Voltage sag source location technology based on corresponding sequence components

Zhu

Wang

Yin

et al. 2015

IET Generation, Transmission & Distribution

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Determining the relative region where voltage sags originates is useful to identify the responsible party causing the power quality problem and monitor system or equipment operating condition. As different kinds of voltage sag will cause different sequence components to change according to the neutral point operation mode in the distribution system, a modified incremental impedance-based method for determining voltage sag source (VSS) location is proposed in this study. This study starts with the VSS direction theory based on incremental impedance, and derives location criteria for different types of VSSs according to the neutral point operation mode of the Chinese distribution network. The VSS location strategy is finally accomplished through the analyses of voltage sag's capacity for passing through the service transformer and the impact of system transient on incremental impedance calculation. The method locates various VSSs based on existing PQ measure points and has clear physics concept. Theoretical analysis, simulation and lab experiments have verified its effectiveness.

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“…The cause of voltage sags include power system fault, starting induction motor, transformer energization which are the single voltage sag disturbance source [9,10], and the interaction among them which can constitute the composite voltage sag disturbance source.…”

Section: Analysis Of Voltage Sag Disturbance Sourcementioning

confidence: 99%

The method to reduce identification feature of different voltage sag disturbance source based on principal component analysis

Wang

Wang²,

Jia

2014

2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific)

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Voltage sag is a typical power quality disturbance. Identify the type of disturbance source causing voltage sag accurately is one of the important matters in power quality monitoring and management. Due to the correlativity and redundancy of the features, the identification method for voltage sag disturbance source is low accuracy. To resolve the problem, this paper proposes a method of feature reduction of voltage sag disturbance based on principal component analysis (PCA). Through the analysis of single disturbance source of voltage sag and composite disturbance source of voltage sag, multiple feature indices of voltage sag are obtained using wavelet coefficients in terms of statistics , wave morphology , entropy , energy , etc. These original feature indices are correlative and redundant. Based on PCA, the original feature indices are normalized, and then the correlation coefficient matrix is calculated, a couple of comprehensive feature indices after reduction can be obtained lastly. The correlativity and redundancy of the comprehensive feature indices are eliminated effectively. The support vector machines (SVM) is used to verify the method. The simulation results show that comprehensive feature indices after reduction can effectively reduce the number of feature vectors which are input to SVM and the identification accuracy which is obtained using comprehensive feature indices is higher than the original features indices in the classification and identification of single and composite disturbance sources of voltage sag under different noisy conditions.

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Distribution system voltage sags: interaction with motor and drive loads

Cited by 19 publications

References 5 publications

A Study of Voltage Sags Generated by Induction Motor Starting

A Study of Voltage Sags Generated by Induction Motor Starting

Voltage sag source location technology based on corresponding sequence components

The method to reduce identification feature of different voltage sag disturbance source based on principal component analysis

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