New Measures of Power-Grid Voltage Variation

Wetula, A.; Bień, A.

doi:10.1109/tpwrd.2014.2317234

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…This can be achieved by averaging instantaneous frequency estimates with an averaging filter . The length of the filter has to be chosen in accordance with the dynamics of the frequency regulation process .…”

Section: The Proposed Methodsmentioning

confidence: 99%

A new method for noninvasive measurement of grid harmonic impedance with data selection

Borkowski

2015

Int. Trans. Electr. Energ. Syst.

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Summary The paper presents a new, noninvasive method for the measurement of power grid harmonic impedance. The method is a robust variant of transfer function estimation method. Its novelty lays in the way of selecting local harmonic impedance estimates for averaging, based on input–output coherence estimates, which immunizes it against background voltage variations. The method is validated by simulation including varying background voltage harmonics, both for fixed and slowly varying harmonic impedance. It has also been tested with noisy and nonsynchronously sampled signals. The method is compared with another noninvasive method with data selection. Simulation results clearly show that the proposed method returns lower estimation errors. Also, its computational complexity is significantly reduced compared with the reference one. The presented results of a field test conducted at medium‐voltage/low‐voltage substation prove that the method works well in real conditions. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: The Proposed Methodsmentioning

confidence: 99%

A new method for noninvasive measurement of grid harmonic impedance with data selection

Borkowski

2015

Int. Trans. Electr. Energ. Syst.

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“…• modification of currently used measuring instruments [10]- [12], or use of other measures of voltage fluctuation severity assessment [13]- [16];…”

Section: Introductionmentioning

confidence: 99%

IEC Flickermeter Measurement Results for Distorted Modulating Signal while Supplied with Distorted Voltage

Kuwałek

2022

Preprint

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The paper presents IEC flickermeter measurement results for voltage fluctuations modelled by amplitude modulation of distorted supply voltage. The supply voltage distortion caused by electronic and power electronic devices in the "clipped cosine" form is assumed. This type of supply voltage distortion is a common disturbance in low voltage networks. Several arbitrary distorted waveforms of the modulating signal with different modulation depth and modulating frequency up to approx. 1 kHz are selected to determine the dependence of severity of voltage fluctuation on their shape. The paper mainly presents the dependence of voltage fluctuation severity with a frequency greater than 3f f f c, where f f f c is the power frequency. The voltage fluctuation severity and the dependencies associated with it have been determined on the basis of numerical simulation studies and experimental laboratory tests.

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“…However, the existing indicators do not allow: unequivocal identification of the source of disturbance; and the assessment of its character, considering the psychophysical state of the observer of the obnoxious flicker and the operation of loads supplied from the same circuit as the source of the disturbance. The presented problem can be solved by recording the voltage signal and using: wavelet transform [8,9], Wigner-Ville transform [10], Hilbert transform [11,12], genetic algorithms [13], or the Kalman Filter [14]. However, at present these methods cannot be used in practical implementations due to the need to store a significant amount of data to implement these algorithms during continuous monitoring of the power grid.…”

Section: Introductionmentioning

confidence: 99%

“…• No modification of currently used measuring and recording devices in practice; • Implementation of the currently proposed signal analysis algorithms [8][9][10][11][12][13] for the recreated voltage envelope; load, e.g., about the frequency of changes in the state of the disturbance source [16].…”

Section: Introductionmentioning

confidence: 99%

Recreation of Voltage Fluctuation Using Basic Parameters Measured in the Power Grid

Kuwałek

Jesko

2020

J. Electr. Eng. Technol.

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The article presents the preliminary research results on recreating the envelope using the basic parameters measured in the power grid. Six novel algorithms were presented. The quality of proposed algorithms was verified based on the short-term flicker indicator P st and instantaneous flicker P inst. Probability theory was used in some of the presented algorithms, considering the random operation of real sources of voltage fluctuations. At the beginning of the article an introduction containing the essence of the discussed issues is presented. Next, description of the basic measured parameters in the power grid are presented, being the input data of the tested algorithms. The subsequent part presents the operation of individual algorithms, the correctness of which was verified by laboratory studies and numerical simulations. In addition, the operation of the proposed algorithms for real measurements made for the wastewater pumping station supply circuit is also presented. The metrological interpretation of the results obtained from the numerical simulation and experimental research is discussed, and the conclusions are presented.

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New Measures of Power-Grid Voltage Variation

Cited by 13 publications

References 19 publications

A new method for noninvasive measurement of grid harmonic impedance with data selection

A new method for noninvasive measurement of grid harmonic impedance with data selection

IEC Flickermeter Measurement Results for Distorted Modulating Signal while Supplied with Distorted Voltage

Recreation of Voltage Fluctuation Using Basic Parameters Measured in the Power Grid

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