Online Thevenin’s Equivalent Using Local PMU Measurements

Abdelkader, Sobhy M.

doi:10.24084/repqj09.604

Cited by 8 publications

(11 citation statements)

References 4 publications

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“…Arranging the coefficients of , , and the first two terms of ( 22), it can be written as follows: (23) where (24) It may have become clear now that a group of three different measurements can produce a line representing the relationship between the Thèvenin impedance parameters and . As shown by ( 23) and (24), constructing ( 23) is simple and can be done in a structured and systematic way.…”

Section: Methods For Te Determinationmentioning

confidence: 99%

“…The availability of PMU measurements has opened the door to different possibilities of online determination of the TE and to enhance the system monitoring and control functions using the TE. In [23], a method for determining TE utilizing three PMU measurements, where two circular loci in the Z-plane were defined each using two measurements. The intersection of the two loci determines and hence is determined using the voltage equation for any of the measurements.…”

Section: Introductionmentioning

confidence: 99%

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Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Abdelkader

Morrow

2015

IEEE Trans. Power Syst.

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This paper presents a new method for online determination of the Thèvenin equivalent parameters of a power system at a given node using the local PMU measurements at that node. The method takes into account the measurement errors and the changes in the system side. An analysis of the effects of changes in system side is carried out on a simple two-bus system to gain an insight of the effect of system side changes on the estimated Thévenin equivalent parameters. The proposed method uses voltage and current magnitudes as well as active and reactive powers; thus avoiding the effect of phase angle drift of the PMU and the need to synchronize measurements at different instances to the same reference. Applying the method to the IEEE 30-bus test system has shown its ability to correctly determine the Thévenin equivalent even in the presence of measurement errors and/or system side changes.

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Section: Methods For Te Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Abdelkader

Morrow

2015

IEEE Trans. Power Syst.

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“…A protection boundary setting adjustment method is proposed which uses an equivalent Thevenin's model as in [21]- [23], to obtain relay settings required for prevailing system condition. A load calculation method based on sensitivity of apparent impedance to load change is done which provides change in load values for secure operation of relays.…”

Section: Proposed Methodsmentioning

confidence: 99%

“…The three sets of phasor measurements obtained via WAMS are referred to the same reference. Using three sets of voltage and current measurements, power flow through the line is calculated and the following equations can be written [21], [22]: Considering first two sets of measurement we get:…”

Section: A Relay Boundary Setting Adjustment (Rbsa)mentioning

confidence: 99%

Enhanced Protection Security Using the System Integrity Protection Scheme (SIPS)

Kundu

Pradhan

2016

IEEE Trans. Power Delivery

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Events such as faults, loss of load or generation may cause unwanted relay operations which initiate cascade tripping leading to system collapse. Security of power system protection is a major concern for utilities. A System Integrated Protection Scheme (SIPS) based approach is proposed for improving security of protection operations. Identification of vulnerable points which may maloperate during a stressed condition and initiation of preventive strategy are proposed in this paper. Synchronized measurements obtained from strategic locations in the system are used for this purpose. It includes two algorithms; the first of which changes the operating characteristic of relays in accordance with system condition. The second one, identifies nodes in the system where load reduction can reduce the risk of maloperation. The proposed method is tested for New England 39 bus system and found to be accurate.

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“…In [12], is estimated from an improved recursive method, which uses differential variables to reflect parameters changes. A mathematical equation is proposed in [13] to correcting the phase drift caused by slip frequency between PMU successive phasors. The corrected phasors then is used for TE estimation from a generator terminal.…”

Section: Introductionmentioning

confidence: 99%

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

Osbouei

Karegar

2017

Scientia Iranica

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This paper presents a novel algorithm based on phasor measurements to online estimation of power system Thévenin Equivalent (TE) from a generator terminal. Three consecutive phasor measurements of generator terminal voltage and current are used to estimate the system TE. In a real network, system frequency deviation from its nominal value will produce some phase drift in consecutive phasors reported by Phasor Measurements Units (PMUs). To correct the phase drift and synchronizing the reported phasors to the same reference, an improved triangulation method is developed. The improved method uses a virtual vector in its structure. Using this vector alleviates the negative impacts of improper data resulting from noise or disturbances which make the simple triangulation method to be useless. The algorithm is tested on standard NE-39 network and is implemented in Shahid Beheshti University (SBU) protection laboratory to verify the results in a practical area. The obtained results show that the new method can efficiently estimate the in online mode in steady-state and transient conditions.

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Online Thevenin’s Equivalent Using Local PMU Measurements

Cited by 8 publications

References 4 publications

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Online Thévenin Equivalent Determination Considering System Side Changes and Measurement Errors

Enhanced Protection Security Using the System Integrity Protection Scheme (SIPS)

Power System Thévenin Equivalent Estimation Based on Phasor Measurements

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