Short-circuit current estimation from measurements of voltage and current during disturbances

Srinivasan, K.; Lafond, C.; Jutras, R.

doi:10.1109/28.605749

Cited by 8 publications

(12 citation statements)

References 6 publications

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“…3., the application of a least square method is described for a set of phasors measured or calculated from PMU measurements during natural load variation. From (8), the relation between system back impedance and pointl data (V'I' 11) are shown as follows;…”

Section: Circuit Currentmentioning

confidence: 99%

Short circuit current estimation using PMU measurements during normal load variation

Verma

Nakachi

Wazawa

et al. 2012

2012 3rd IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

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This p a p er p ur p oses a short circuit current estimation method using phasor measurement unit (PMU) measurements (synhcrophasors, hereafter called as phasors) of voltages and currents obtained during normal load variation. The method follows the basic concept of representing the source side of power system by an equivalent circuit with a voltage behind back impedance and employs a set of voltage and current phasors measured at substations over a certain p eriod. In order to improve an accuracy of the proposed estimation method, the concept of using a difference between the two consecutive phasors is introduced. Furthermore, to make the method applicable to a real world system, the estimation process is augmented by implementing a reference phasor concept to remove the effects of system wide frequency variations and a filtering process to filter out the outlier phasors. Finally, the validity and effectiveness of the purposed methods were checked and confirmed using field tests.Index Terms--Field testing, least square method, normal load variation, outlier filter, phasor measurement unit (PMU), short circuit current, short circuit impedance, reference phasor, two consecutive phasors difference based approach.

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Section: Circuit Currentmentioning

confidence: 99%

Short circuit current estimation using PMU measurements during normal load variation

Verma

Nakachi

Wazawa

et al. 2012

2012 3rd IEEE PES Innovative Smart Grid Technologies Europe (ISGT Europe)

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“…We formulated a method based on the method of LS and a method based on the covariance for the basic model shown in Fig. , then performed evaluations using the analog simulator testing described later.…”

Section: Basic Principle and Evaluation With An Analog Simulatormentioning

confidence: 99%

“…, the short circuit impedance is found from load impedances Z L1 and Z L2 for multiple (N) measurements, and the N short circuit currents are then found using the short circuit impedance and the voltage V 2 at measurement point 2 from Eq. .This method is referred to later as the method of LS. Estimation Method Based on Covariance …”

Section: Basic Principle and Evaluation With An Analog Simulatormentioning

confidence: 99%

“…The method of Ref. [] is extended to find results for the measured data from two points. Assuming that the fluctuations of V G and Z L1 are uncorrelated and that the fluctuations of V G and Z L2 are likewise uncorrelated, Z sys can be found from Eq.…”

Section: Basic Principle and Evaluation With An Analog Simulatormentioning

confidence: 99%

“…In this method a disturbance must be provided, and its usability in a real system is limited. Thus, in attempts at estimation based on power system fluctuations during normal operation, methods of estimating the back impedance by the method of least squares (LS) or by means of the covariance of measured phasor quantities at several instants have been proposed. In these methods, there is no need to apply a disturbance, but because data are measured over a specific time period, changes in the state during that period can easily influence the results.…”

Section: Introductionmentioning

confidence: 99%

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Estimation Methods of Short Circuit Current Using Normal PMU Measurements and Field Testing

Verma

Nakachi

Wazawa

et al. 2014

Electrical Engineering Japan

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SUMMARYThis paper proposes estimation methods for short circuit currents using phasor measurement unit (PMU) measurements (phasors). The methods follow the basic notion of representing the source side of a power system by an equivalent circuit with a voltage behind a back impedance, and employ a set of voltage and current phasors measured at substations during the normal variation of loads in their estimation. In order to improve the estimation accuracy of the proposed methods, the concept of using the changes between consecutive phasors is introduced. Furthermore, to make the methods applicable to a real-world system, the concept of a reference phasor, used to remove the effects of system-wide frequency variations and a filtering process to filter out the outlier phasors, is proposed and implemented. The validity and effectiveness of the proposed methods were checked and confirmed through experiments and field tests. C⃝ 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 188(4): 44-53, 2014; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Short-circuit impedance measurement

Pedersen

Nielsen

Poulsen

2003

IEE Proc., Gener. Transm. Distrib.

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Short-circuit current estimation from measurements of voltage and current during disturbances

Cited by 8 publications

References 6 publications

Short circuit current estimation using PMU measurements during normal load variation

Short circuit current estimation using PMU measurements during normal load variation

Estimation Methods of Short Circuit Current Using Normal PMU Measurements and Field Testing

Short-circuit impedance measurement

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