Review of load-flow calculation methods

Stott, B.

doi:10.1109/proc.1974.9544

Cited by 621 publications

(268 citation statements)

References 38 publications

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“…Slow processing speed of a computer at that time also contributed to slow computation time of Gauss-Seidel. Latter, the Newton Raphson (NR) method was introduced to improve convergence problem of Gauss-Seidel method [1]. In most typical networks, NR converges within five to six iterations.…”

Section: Conventional Load Flow Methodsmentioning

confidence: 99%

“…Load flow analysis also is used intensively in the planning of a new power system network or expansion of existing power system network. Nowadays, load flow analysis is carried out almost exclusively by digital computers and the equations defining the problem are solved by special numerical techniques, which have been developed to suit the special structure of the problem [1,42]. Due to the important of load flow, many studies in improving load flow solution have been conducted [1,6,18,35].…”

Section: Introductionmentioning

confidence: 99%

“…In the past, the studies in the load flow is more inclined to reduce the analysis time through reducing the iteration number and convergence time [1]. For instance, in [1] and [2], a fast decoupled method was introduced with the objective of reducing the analysis time through simplification of the Newton method equations.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in [1] and [2], a fast decoupled method was introduced with the objective of reducing the analysis time through simplification of the Newton method equations. However, as the demand of power increasing in early 80's, it was found that the conventional load flow method produced divergence solution for ill-conditioned system [4,6].…”

Section: Introductionmentioning

confidence: 99%

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Critical Reviews of Load Flow Methods for Well, Ill and Unsolvable Condition

Shahriari¹,

Mokhlis²,

Bakar³

2012

Journal of Electrical Engineering

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This paper presents a critical review of Load flow methods in well, ill and unsolvable conditioned systems. The comparison studies deals with multiple load flow solution (MLFS), second-order load-flow (SOLF) and continuation load flow (CLF). The ability of theses method to return from unsolvable solution to a solvable solution in load flow analysis is analyzed and discuss thoroughly. Special attention is given to the problems and techniques to provide optimal recommendations of the parameters that are used in these load flow methods. A part of the reviews, this paper also presents the comparison of numerical result using different type of aforesaid load flow methods for well and ill-conditioned systems.K e y w o r d s: second-order load-flow, multiple load flow solution, continuation load flow, ill-conditioned system, unsolvable condition

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Section: Conventional Load Flow Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Critical Reviews of Load Flow Methods for Well, Ill and Unsolvable Condition

Shahriari¹,

Mokhlis²,

Bakar³

2012

Journal of Electrical Engineering

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“…In order to estimate the OTL's contribution to the energy payback in the future, load power should be obtained by load forecast [11][12][13][14][15] and generator outputs should be assigned by production simulation [16][17][18][19]. Then, the ECO can be produced by load flow [20] simulation. Section 3 details the steps comprising the above procedures.…”

Section: Introductionmentioning

confidence: 99%

Estimating life-cycle energy payback ratio of overhead transmission line toward low carbon development

Dong

Chen

Zhang

et al. 2014

J. Mod. Power Syst. Clean Energy

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The energy conservation plays an important role for low carbon development. In order to evaluate the energy conservation in the full life-cycle, a scheme to estimate the energy consumption, or alternatively the energy pay, in constructing an overhead transmission line is proposed in this paper. The analysis of a typical projection is given for demonstration. With new additional overhead transmission lines, the energy consumption, known as the power loss in power network, is expected to be decline, which is defined in this paper as the energy payback. In order to estimate this kind of contribution, the scheme that consisted of load forecast, production simulation for generating systems, load flow simulation and power loss calculation has been proposed. Case studies, based on the IEEE 24-bus test system, are given to demonstrate the efficacy of the schemes. Moreover, several presumptive scenarios are deployed and analysed with the presented schemes for comparison.

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Elimination of floating nodes for load flow calculation

Matoba

Yokoyama

1999

Elect. Eng. Jpn.

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Most approaches aiming at reduction of the power flow computation time approximate the Jacobian matrix. Thus, the convergence is degraded compared to the conventional Newton method. This paper proposes a new approach for reducing the processing time by considering the fact that half of the nodes in real power systems are floating nodes that can be removed. In the conventional reduced matrix approach where the floating nodes are removed, the sparsity is lost. The method in this paper does not remove all of the floating nodes but keeps some nodes by using an optimal criterion for keeping the sparsity. The criterion is to indicate the minimum number of elements in the reduced matrix. This method has been applied to a 1000‐node test system. It was verified that the number of elements of the Jacobian has been reduced to about one‐half that of the conventional matrix. And computation time has been remarkably improved without sacrificing the convergence characteristics for the power flow computation. © 1999 Scripta Technica, Electr Eng Jpn, 129(2): 22–30, 1999

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Review of load-flow calculation methods

Cited by 621 publications

References 38 publications

Critical Reviews of Load Flow Methods for Well, Ill and Unsolvable Condition

Critical Reviews of Load Flow Methods for Well, Ill and Unsolvable Condition

Estimating life-cycle energy payback ratio of overhead transmission line toward low carbon development

Elimination of floating nodes for load flow calculation

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