A Fault Program with Macros, Monitors, and Direct Compensation in Mutual Groups

Abstract-Analysis of faulted power systems in 3-phase coordinates is desirable when dealing with unbalanced networks and complex faults. Thevenin's model in 3-phase domain is wellknown for shunt faults. However, lack of generic circuit model for series and simultaneous faults is an impediment, as it sacrifices both simplicity and computational efficiency. In this paper, we extend this approach to arbitrarily complex faults. Case studies with complex faults on two example systems demonstrate the claims made in the paper.

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“…sim th (12) where, resultant Thevenin's voltage source vector and impedance matrix are given by the following relationships: …”

Section: B Simultaneous Faultsmentioning

confidence: 99%

“…The advantage of this approach is that original Y bus need not to be modified and hence no need of refactorization. In [12], the idea of compensated Thevenin's impedance is developed to accommodate line outage in fault analysis. The key idea is to express network changes as low-order matrix product of the form BRC T .…”

Section: Introductionmentioning

confidence: 99%

Analysis of faulted power systems in three phase coordinates - a generic approach

Gajbhiye

Kulkarni

Soman

2005

2005 International Power Engineering Conference

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“…The procedures used to calculate these voltage changes range from a circuit analysis based approach, described by Stagg and El-Abiad [15], to compensation based methods, such as used by Brandwajn [11], Alvardo [16], or van Amerongen [17].…”

Section: Illustrating Impact Of Generator Design Change On Netwomentioning

confidence: 99%

“…2) Identification of Problematic Fault Conditions: A feature of (16) is that it provides an estimate of the maximum possible change to fault behavior resulting from the connection of a "new" physically realisable generator. It is important to realize that the normalized separation of breakpoints, , is a vector quantity.…”

Section: ) Absolute Variation In Fault Parametersmentioning

confidence: 99%

“…Finally, Fig. 10 also shows the bounds to potential change in fault behavior, which can be determined from (16), that correspond to each different value of . It is clear that the observed change in fault behavior is similar to but still bounded by the limits determined from the normalized separation of breakpoints.…”

Section: ) Absolute Variation In Fault Parametersmentioning

confidence: 99%

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Analytical Representation of the Relationship Between Generator Design and System Fault Behavior

McDonald

Saha

2005

IEEE Trans. Power Syst.

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Abstract-This paper presents the development and application of an analytical method for formalizing the dependence of the behavior of a large power system under fault conditions on the equivalent impedance presented by a single generator. After selecting an appropriate generator model, it is demonstrated that network-wide fault behavior can be expressed as a rational function of the equivalent impedance presented by a single generator under fault conditions. This representation simplifies the identification and depiction of constraints imposed by system configuration on the ability of a generator replacement or augmentation to affect fault behavior. The effectiveness of the proposed method is confirmed by considering the three-phase fault currents produced in a six-bus test system. In addition, the new analytical method is extended to obtain a numerical estimate of the maximum possible change in fault behavior that could result from a generator replacement or augmentation. Overall, the new approach aids in the evaluation of the suitability of generator modification or augmentation schemes.Index Terms-Power generation faults, power generation planning, power system faults, rational functions.

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Fault analysis in four-wire distribution networks

Ćirić

Ochoa

Padilla-Feltrin

et al. 2005

IEE Proc., Gener. Transm. Distrib.

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The neutral wire in most existing power flow and fault analysis software is usually merged into phase wires using Kron's reduction method. In some applications such as fault analysis, fault location, power quality studies, safety analysis, loss analysis, etc., knowledge of the neutral wire and ground currents and voltages could be of particular interest. In this paper, a general short circuit analysis algorithm for three-phase four-wire distribution networks, based on the hybrid compensation method, is presented. In this novel use of the technique, the neutral wire and assumed ground conductor are explicitly represented. A generalized fault analysis method is applied on the distribution network for conditions with and without embedded generation. Results obtained from several case studies on medium and low voltage test networks, with unbalanced loads, for isolated and multi-grounded neutral scenarios, are presented and discussed. Simulation results show the effects of neutrals and system grounding on the operation of the distribution feeders.

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A Fault Program with Macros, Monitors, and Direct Compensation in Mutual Groups

Cited by 3 publications

References 1 publication

Analysis of faulted power systems in three phase coordinates - a generic approach

Analysis of faulted power systems in three phase coordinates - a generic approach

Analytical Representation of the Relationship Between Generator Design and System Fault Behavior

Fault analysis in four-wire distribution networks

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