Unsymmetrical short-circuit analysis for distribution system considering loads

Mathur, Abhishek; Pant, Vinay; Das, Biswarup

doi:10.1016/j.ijepes.2015.02.003

Cited by 23 publications

(21 citation statements)

References 21 publications

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“…The model of the network used in this work was created based on [3,18,19]. The model resembles a real-world system.…”

Section: Methodsmentioning

confidence: 99%

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A Genetic Algorithm-Based Approach for Three-Phase Fault Evaluation in a Distribution Network

Shambare¹,

Sun²,

Imoru³

2020

IJC

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Standard IEC 60909 provides all the basic information that is used in the evaluation of three-phase short circuit faults. However, it uses numerous estimations in its fault evaluation procedures. It estimates voltage factors, resistance to reactance ratios (R/X), resistance to impedance ratios (R/Z) and other scaling factors. These estimates do not cater for every nominal voltage. Users often have to approximate these values. In this paper, adjustments were made to the genetic algorithm (GA) with regards to gene replacements and arrangement of scores and expectation. During fault computation, the GA was used to stochastically determine R/X and R/Z ratios with regards to the parameters of the power system. The GA was tested on a nominal voltage that is properly catered for by Standard IEC. The GA results and the IEC values were within an approximate range. This implies that the developed GA can be further used to determine these ratios for nominal voltages that are not sufficiently accounted for by Standard IEC. This leads to obtaining precise fault values in all instances.

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“…The model of the network used in this work was created based on [3,18,19]. The model resembles a real-world system.…”

Section: Methodsmentioning

confidence: 99%

“…1(b), the fault is located at the generator terminals. For faults located far away from the sources, the effects of the parameters of the sources as rotating machines can be ignored, but for faults located at the generator terminals, the effects of the generator parameters should be taken into account [17,18].…”

Section: Characteristics Of Faultsmentioning

confidence: 99%

A Genetic Algorithm-Based Approach for Three-Phase Fault Evaluation in a Distribution Network

Shambare¹,

Sun²,

Imoru³

2020

IJC

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“…The analysis will typically aim to determine the circuit rating of the equipment to be purchased, installed and commissioned. Also, equipment manufacturers use the ratings heir customers to ensure that their equipment are designed to satisfy client's safety and operational specifications under certain [10][11][12][13]. As the parameters of a power system and fault , short circuit analysis which depicts the system dynamics is in order to achieve the utility operational ensuring high quality, continuous and safe delivery of power to consumers [17][18][19][20].…”

Section: Safeguard the System To Supply Powermentioning

confidence: 99%

Validating Response of AC Microgrid to Line-to-Line Short Circuit in Islanded Mode Using Dynamic Analysis

Aminu

2019

ACRI

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This paper is presented in an attempt to validate the dynamic response of a microgrid to line-to-line short circuit. The microgrid components include two identical Wind Turbine Generators (WTGs) tied to a 100MVA, 13.8kV utility via a Point of Common Coupling (PCC). The utility-microgrid testbed is modeled in SIMPOWERSystems® using two Doubly-Fed Induction Generators (DFIGs) in the microgrid side. While in islanded operating mode, line-to-line short circuit fault is applied at 6.0s and withdrawn at 8.0s, obtaining a 50.0s dynamic response of the system for different fault locations, under voltage and reactive power control regimes of the wind turbine controller. For measurement purpose, the absolute value of the stator complex voltage is transformed to reference frame. Bidirectional power flow between the two feeders is established in the study. The study also confirms that the microgrid composed of DFIGs offer reactive power management capability, particularly by presenting superior performance when stressed under Q control regime than under V control regime. Finally, the response of the testbed to line-to-line short circuit has been validated and shown to be consistent with established short circuit theory.

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“…Furthermore, the rated capacity of the constant power and current loads is often specified by active and reactive power in kVA or MVA. Thus, the constant power and current loads can be approximated by the constant impedance load in short-circuit analyses [21,22,27].…”

Section: Transformation Of Constant Current and Power Loads To Equivamentioning

confidence: 99%

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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Unsymmetrical short-circuit analysis for distribution system considering loads

Cited by 23 publications

References 21 publications

A Genetic Algorithm-Based Approach for Three-Phase Fault Evaluation in a Distribution Network

A Genetic Algorithm-Based Approach for Three-Phase Fault Evaluation in a Distribution Network

Validating Response of AC Microgrid to Line-to-Line Short Circuit in Islanded Mode Using Dynamic Analysis

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

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