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

Gajbhiye, Rajeev; Kulkarni, Purushottam; Soman, S. A.

doi:10.1109/ipec.2005.207063

Cited by 13 publications

(7 citation statements)

References 12 publications

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“…Thus, the pre-fault voltage could be used in the proposed SCC model, which transformed the load to the equivalent impedance in Equation (11). To determine the SCC of the proposed case study, this study applied the pre-fault voltage of a bus (to which the loads were connected) to Equations (6), (10), and (11). In other words, the first two loads that were connected in a wye were transformed to the equivalent impedance by the following: .3615…”

Section: Seven-bus Radial Systemmentioning

confidence: 99%

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The Effect of Unbalanced Impedance Loads on the Short-Circuit Current

Kim

2018

Energies

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Conventional short-circuit studies often neglect the load current because the short-circuit current (SCC) flowing from generators is much greater than the SCC that is affected by various loading conditions. As distributed or clustered loads that are unbalanced in phases are connected to the grid, they can also change the magnitude and phase angle of the SCC, despite their small capacities. Thus, the objective of this study is to present algorithms that are able to analyze such an impedance unbalanced load. For this purpose, this study initially derives an SCC model of the unbalanced impedance load in phases. Since the proposed SCC model requires the pre-fault voltage, it uses a power-flow analysis algorithm that iteratively calculates the current that is to be injected and the pre-fault voltage, using the bus impedance matrix. Then, the proposed SCC calculation algorithm transforms the unbalanced loads into equivalent impedances, using the pre-fault voltage, and adds them to sequence networks as input data, using the proposed SCC model. The proposed algorithms are verified in various case studies. As a result, the proposed SCC calculation algorithms are more accurate, because they do not neglect unbalanced loads.

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Section: Seven-bus Radial Systemmentioning

confidence: 99%

“…To determine the SCC of the proposed case study, this study applied the pre-fault voltage of a bus (to which the loads were connected) to Equations (6), (10), and (11). In other words, the first two loads that were connected in a wye were transformed to the equivalent impedance by the following: …”

Section: Short-circuit Current Calculationmentioning

confidence: 99%

The Effect of Unbalanced Impedance Loads on the Short-Circuit Current

Kim

2018

Energies

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“…In [5], the calculation of simultaneous faults in power systems was investigated. A systematic short-circuit analysis method for unbalanced distribution systems based on exact three phase models and two relationship matrices of distribution systems was presented in [6], while [7] described a generic approach to the analysis of faulted power systems in three phase coordinates. The influence of mutual coupling between parallel transmission lines on single line-to ground and double line-to-ground faults was discussed in [8] and a detailed analysis of the apparent impedance as seen from the relaying point due to faults on parallel transmission lines was presented in [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of TCVR Controlled Voltage on Short-Circuit Calculations in Case of Ground Fault in the Algerian Network

Zellagui

Hassan²,

Chaghi

2015

IJCA

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Flexible AC Transmission Systems (FACTS) technology has been developed to control voltage and reactive power in power systems by incorporating high speed power electronic devices. The FACTS device presented in this research work is Thyristor Controlled Voltage Regulator (TCVR) which is a novel FACTS device that aims to control system voltage and hence improves voltage regulation. This paper studies the effect of voltages injected by TCVR, whether positive or negative, on short-circuit calculations. The type of fault considered is a ground fault that occurs at the end of a high voltage line compensated at its mid point by TCVR while maintaining a fixed fault resistance. A case study is selected for a high voltage power line in the Algerian transmission network. In this research work, the illustrated simulation results show perfect agreement with the presented theoretical analysis which is based on the method of symmetrical components.

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“…As mentioned by the authors, the modeling of transformers in the classical nodal admittance matrix is non-trivial. Generic methods based on the derivation of Thevenin equivalents using the nodal admittance matrix do also exist [9].…”

Section: Introductionmentioning

confidence: 99%

Accelerated Computation of Multiphase Short Circuit Summary for Unbalanced Distribution Systems Using the Concept of Selected Inversion

Lacroix

Koçar

Belletete³

2013

IEEE Trans. Power Syst.

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In this paper, an ultra-fast algorithm for the computation of multiphase short-circuit currents at all buses is proposed by addressing the concept of selected inversion. The short circuit summary is achieved through the computation of multiphase Thevenin equivalent at each bus by using the augmented nodal matrix. This typically requires the sequential solution of linear system of equations, i.e., direct inversion which can be demanding in terms of CPU time. In this paper, it is shown that dramatic gains in computational time can be obtained when the selected inversion (SelInv) technique is performed where only a subset of entries of the inverse of augmented nodal matrix is computed. These entries include the phase domain Thevenin impedances seen from network buses which are used in the computation of short-circuit currents with the predefined boundary conditions specific to the fault type. The performance of the method is demonstrated with very large scale and realistic distribution systems.Index Terms-Distribution systems, power system analysis, short circuit, sparse matrix methods, unbalanced networks.

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

Cited by 13 publications

References 12 publications

The Effect of Unbalanced Impedance Loads on the Short-Circuit Current

The Effect of Unbalanced Impedance Loads on the Short-Circuit Current

Effect of TCVR Controlled Voltage on Short-Circuit Calculations in Case of Ground Fault in the Algerian Network

Accelerated Computation of Multiphase Short Circuit Summary for Unbalanced Distribution Systems Using the Concept of Selected Inversion

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