Implementation of an active fault level monitoring system for distributed generation integration

Berry, Jonathan; Jupe, Samuel; Meisinger, Mike; Outram, John

doi:10.1049/cp.2013.0840

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…However, the approach only derives the symmetrical component of the fault level (rms break current) and does not account for downstream motor and DG contributions. It can also be considered passive [6] or slow time (as oppose to real time) as it relies on adequate changes in voltage and current which may not occur frequently.…”

Section: Fault‐level Estimation During Normal Load Conditionsmentioning

confidence: 99%

“…Other approaches aim to introduce controlled external disturbances. The technique reported in [6] utilises the switching operation of pulse closers in order to cause a change in network operating conditions and conduct estimations in real time. This may limit such a scheme's wide‐scale deployment as it relies on the density of pulse closers installed in the network and can therefore incur significant cost implications.…”

Section: Fault‐level Estimation During Normal Load Conditionsmentioning

confidence: 99%

“…The adopted industry practice for short‐circuit analysis is in accordance with the ERG74 and IEC60609 standards which are regarded as somewhat conservative by utilities [6]. A study [7] evaluating the accuracy of fault‐level assessments highlighted errors in calculated making and breaking currents due to sensitivity to certain network parameters.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance of fault‐level estimation functions in future distribution networks

Ahmed

Booth

Coffele

2018

J. eng.

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Section: Fault‐level Estimation During Normal Load Conditionsmentioning

confidence: 99%

Section: Fault‐level Estimation During Normal Load Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance of fault‐level estimation functions in future distribution networks

Ahmed

Booth

Coffele

2018

J. eng.

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“…Both the methods are valid for the FLP during the power system planning period. The rough model can be used and a conservative value can be acquired using the first method, while the latter method can provide an accurate result but is complex and time consuming, so it has been used mainly at higher network voltages (for example at 33kV and above) [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In [5], the artificial disturbances are applied to the power system and the change of the voltage and current are used for calculating the impedance. In [13], the harmonic current with a frequency band around the fundamental frequency is injected to the power system and then the impedance and fault current are estimated.…”

Section: Introductionmentioning

confidence: 99%

Fault level prediction for distribution network using fuzzy logic identifier

Shi

Wang

2016

MATEC Web Conf.

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Abstract. With the increasing penetration of the renewable power energy sources, the potential fault current of the distribution power systems changes more frequently as the connection structure of the distribution power system varies from time to time. Traditionally, the fault level can be estimated through short circuit analysis which is time consuming and sometimes difficult as it needs to know the parameters of the transmission line and transformers as well as the structure of the power system. In this paper, an online-used fault level prediction method is proposed via monitoring the phasor value of the local positive-sequence voltage and current. The ratio of the voltage change and current change are used to distinguish the natural deviation of the load from the switching operations or disturbances on the grid side. Several continuous changes of the voltage and current caused by load fluctuations are recorded and used to parameterize the equivalent circuit of the power system and to estimate the fault current level. A fuzzy logic identifier is used for adaptively selecting and recording the satisfactory changes by defining an index of confidence level. The implementation of the proposed scheme is demonstrated in a relay after introducing a low-voltage blocking function. A typical distribution power system with renewable generators is established in PSCAD/EMTDC and is used to verify the effectiveness and accuracy of the proposed method under various load changing conditions.

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