An Alternative Approach to Locating Voltage Sag Source Side at the Point of Common Coupling Based on Power-Flow Information

Passos, Frederico Oliveira; Filho, Jose Maria de Carvalho; Leborgne, Roberto Chouhy; Silveira, Paulo M.; Ribeiro, Paulo F.

doi:10.1007/s40313-015-0199-x

Cited by 19 publications

(5 citation statements)

References 14 publications

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“…A development of this method based on Hilbert transformation and applied with reactive power to locate voltage sag source is introduced in Kong et al. Passos et al, basing on Boolean logics, improve this arithmetic. The slope polarity of system trajectory method (SST) …”

Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

“…Regarding the case when the sag occurs at different fault points, the ratio of a product of the fundamental voltage and power factor | V cosθ| at monitoring point and the fundamental current I are different; the SST method proposed in Passos et al uses least square method to investigate the sign of the slope of the system trajectory and to locate the voltage sag source by judging its sign. The voltage and current phasors are measured at monitoring point; the active power delivered is equal to the difference between the source power and the power loss from monitoring point to power supply, then:

italicVI cos θ_{2} = E_{1} I cos θ_{1} - R I^{2}

where V and I are the voltage and current, respectively, measured at monitoring point; θ 2 represents phase angle difference between V and I ; E 1 is power supply potential; θ 1 represents the phase angle difference between E 1 and I ; and R is the equivalent resistance of power loss between monitoring point and power supply source.…”

Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

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Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Tang

Wei

Chen

et al. 2017

Int Trans Electr Energ Syst

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Summary This paper briefly introduces the existing methods for voltage sag source location and theoretically analyzes some reasons why high accuracy cannot be achieved by using these methods. Based on the redefined voltage sag source location “reference direction” and the analysis of voltage sag source's influences in power network, it is pointed out that observing from disturbance source point to both sides of monitoring services, any power network can be equivalent to 2 active single‐port networks and the networks can be equally replaced by “Thevenin's equivalent circuit.” By judging the sign of the internal resistance in Thevenin' s equivalent circuit, the origin of voltage sag disturbance can be easily identified. The calculation of internal transient resistance is given based on the application of space vector theory. This method can locate voltage sag source with an accuracy of 100% verified by simulation experiments. It is a very practical method that is not only applicable in radial and nonradial power systems but also in networks of neutral grounded effectively or ineffectively.

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Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

italicVI cos θ_{2} = E_{1} I cos θ_{1} - R I^{2}

Section: Existing Methods For Voltage Sag Source Locationmentioning

confidence: 99%

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Tang

Wei

Chen

et al. 2017

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…The methods of the first category consider changes of power and energy, before and during a voltage sag. [7][8][9][10][11][12][13][14][15] Methods of the second category utilize changes of current and were based on the slope of voltage-current fitting 16 and on the variation of the real current. 17 The methods of the third category are related to changes in impedance during voltage sags.…”

Section: Previous and Related Workmentioning

confidence: 99%

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

Mohammadi

Leborgne

2020

Int Trans Electr Energ Syst

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Summary Constant power (Scte) loads such as large induction motors or power converters in customer facilities of distribution systems have a significant effect on the fault currents and thus on the relative location of voltage sag sources. This paper evaluates the methods for determining the relative location of voltage sag sources at the point of common coupling (PCC) of Scte loads. The results of simulating 800 voltage sag events on IEEE 13 bus unbalance system (modelled by ATP) show that many of the methods fail at classifying upstream (US) faults at the PCC of Scte loads. Therefore, a new method is introduced using the ratio of current magnitudes and changes of power angle in positive sequence components, during and before the voltage sag, with a determined threshold for the currents and a specified tolerance for the power angle obtained from voltage sags generated by different fault types. The results obtained in the proposed index for similar simulation cases show that the method applied to monitors installed at the PCC of the Scte loads is very accurate. Also, the proposed index is effective for higher resistance faults and changes in the short circuit capacity (SCC) of the main grid.

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“…Different algorithms can be considered to derive direction, that is to determine if the voltage dip is upstream or downstream from the measurement point. A set of Boolean logics are used in [16] to track power flow during symmetrical and asymmetrical voltage dips to identify the direction of the voltage dip source. In [17], voltage information only is considered to identify the source of the voltage dip as being in the network connected to the primary or to the secondary sides of a transformer.…”

Section: Introductionmentioning

confidence: 99%

A Practical Solution for Locating the Source of Voltage Dips in HV/MV Interconnected Grids

Castello

Muscas

Pegoraro

et al. 2023

IEEE Open J. Power Energy

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An Alternative Approach to Locating Voltage Sag Source Side at the Point of Common Coupling Based on Power-Flow Information

Cited by 19 publications

References 14 publications

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Voltage sag source identification based on the sign of internal resistance in a “Thevenin's equivalent circuit”

Relative location of voltage sags source at the point of common coupling of constant power loads in distribution systems

A Practical Solution for Locating the Source of Voltage Dips in HV/MV Interconnected Grids

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