Comparison of the Holomorphic Embedding Load Flow Method with Established Power Flow Algorithms and a New Hybrid Approach

Sauter, Patrick S.; Braun, Christian Alexander; Kluwe, Mathias; Hohmann, Sören

doi:10.1109/greentech.2017.36

Cited by 13 publications

(13 citation statements)

References 12 publications

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“…In this sense, given that the same load flow algorithm is selected for the proposed and standard method, we conclude that their convergence properties are identical and described by properties of the base algorithm itself. Since load flow algorithms are well-documented in the literature, we refer the reader to it [11]- [15], [24]- [28].…”

Section: B Convergence Propertiesmentioning

confidence: 99%

Reduced Complexity Estimation of Neutral Voltages in Terms of Grounding Impedances via Phasor Interpolation

2020

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A novel method based on phasor interpolation is proposed for solving the distribution system problem of computing bus neutral voltages as functions of bus grounding impedances. The proposed approach has the salient feature of exponentially reduced computational complexity, with respect to the number of groundable buses, when compared to the standard procedure of iterating load flow for all grounding impedance setups. This is achieved by computing load flow for a subset of grounding impedances and subsequently estimating voltage for the remaining cases via phasor interpolation. To validate the proposed method, case studies based on computer simulations are considered for assessing estimation error and processing time of the proposed method. Obtained results confirm that the proposed methods yields significant reduction of execution time with low error in the estimation of neutral voltages, compared to exact results computed via standard procedures based on iteration of load flow algorithms.

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Section: B Convergence Propertiesmentioning

confidence: 99%

Reduced Complexity Estimation of Neutral Voltages in Terms of Grounding Impedances via Phasor Interpolation

2020

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“…The holomorphic embedding load flow method (HELF), 28,29 as a noniterative algorithm, does not require any simplifying assumption or initial values. It uses concepts within a complex analysis.…”

Section: Introductionmentioning

confidence: 99%

“…It uses concepts within a complex analysis. The shortcomings of HELF are shown through this comparison particularly concerning the computation time 28 …”

Section: Introductionmentioning

confidence: 99%

A reliable and efficient holomorphic approach to evaluate dynamic available transfer capability

Eidiani

2021

Int Trans Electr Energ Syst

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Summary In the present paper, the static approximate Newton‐Raphson‐Sidel (ANRS) and the developed down‐hill (DDH) algorithm methods were used. To take advantage of both methods, ANRS‐DDH and the revised holomorphic embedding load flow (RHELF) were combined. An approximation of the potential energy boundary surface (APEBS) was also employed in combination with determine transient stability and correct the previous methods. A combination of static method and transient stability led to a combined approach for dynamic available transfer capability (C‐DATC) computation. It is shown that a small correction for these four methods makes the proposed method faster or more accurate. The average root mean square error of the proposed method is half the other methods and the average relative speed of calculations in the proposed methods is 10% higher than the other method. These were confirmed in the networks of Iowa State (145 bus), modified IEEE 118‐bus, and the west of Iran (848 bus) with a large number of wind farms. Finally, the present paper demonstrated that the suggested approach is ideal not only for the operation mode but also for the planning mode and the existence of wind farms.

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“…Steady-state transformer models are frequently employed in power system load flow simulations and other applications in which component modeling can be carried out in quasi -stationary regime [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Different transformer models can be selected according to frequency range [ 10 , 11 , 12 ] and the required trade-off between precision and complexity.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Steady-State Power Transformer Modeling Considering Direct Current Resistance Test Measurements

Corrêa

Vieira

2021

Sensors

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Measurements obtained in transformer tests are routinely used for computing associated steady-state model parameters, which can then be used for load flow simulation and other modeling applications. The short circuit and open circuit tests are most commonly performed with this purpose, allowing estimation of series and parallel branch transformer parameters. In this study, an extended model is proposed which does not employ the usually assumed cantilever circuit approximation and explicitly accounts for transformer connection resistance. An estimation of the proposed model parameters is enabled by usage of additional measurements yielded by the direct current (DC) resistance test. The proposed approach is validated by means of an experiment carried out on a real distribution power transformer, whose results demonstrate that the proposed model and parameter computation approach effectively decompose total transformer resistance into winding and contact components. Furthermore, the numerical results show that contact resistance is not negligible especially for low voltage windings, which reinforces the usefulness of the proposed model in providing detailed modeling of transformer resistances.

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Comparison of the Holomorphic Embedding Load Flow Method with Established Power Flow Algorithms and a New Hybrid Approach

Cited by 13 publications

References 12 publications

Reduced Complexity Estimation of Neutral Voltages in Terms of Grounding Impedances via Phasor Interpolation

Reduced Complexity Estimation of Neutral Voltages in Terms of Grounding Impedances via Phasor Interpolation

A reliable and efficient holomorphic approach to evaluate dynamic available transfer capability

An Approach to Steady-State Power Transformer Modeling Considering Direct Current Resistance Test Measurements

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