A Generation Reallocation and Load Shedding Algorithm

Chan, Steve; Schweppe, Fred C.

doi:10.1109/tpas.1979.319510

Cited by 74 publications

(10 citation statements)

References 4 publications

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“…The performance of the decoupled security enhancement algorithm (DSEA) has been compared with two other methods based on nonlinear programming (NLP) [7] and linear programming (LP) [11], respectively, in terms of execution times and storage requirements. Three tests were done on the 24-busbar IEEE reliability network [17] (see Fig.…”

Section: Comparison Of Methodsmentioning

confidence: 99%

“…This assumption holds depending on the degree of accuracy required, the time available for the calculations in power-system control centres and the magnitude of impedance change with angle for particular phase shifters. The variations of impedance change with angular settings must be taken into account for emergency conditions, because of the wide range of angles Initial overload in line [11][12][13][14] Step (ii)…”

Section: Static Security Control Via Phase Shiftersmentioning

confidence: 99%

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Interactive security evaluation in power-system operation

Ekwue

Short

1983

IEE Proc. C Gener. Transm. Distrib. UK

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The real-time operation of power systems requires security assessment and enhancement computations to ensure that the system stays in the normal state for as long as possible. The paper describes an interactive computer package with colour graphics for power-system operational studies. The package includes load flows, fault analysis and security enhancement. A decoupled algorithm is used for security enhancement, and offers the operator a choice of feasible corrective actions to alleviate line overloads. These corrective actions include generator rescheduling, network voltage adjustments, switching of reactive compensation and the control of phase shifters. Experiments on three test systems are summarised and discussed. ,7 max mm List of symbols nb -number of busbars nl = number of lines 5,-= voltage angle at busbar i V t = voltage magnitude at busbar i 8 a = loss angle of a line /-/ given by sin (R/Z) = current flow between busbars / and / = capacity of line i-j = nominal phase angular displacement of line i-j maximum phase angular displacement minimum phase angular displacement nominal real busbar load new real busbar load after load shedding nominal reactive busbar load new reactive busbar load after load shedding real-power generation rescheduled real-power generation sum of the operating generation and spinning reserve vector of the deviations of abnormal load busbar voltages vector of the deviations of the controlling variables consisting of tap-changing transformer ratios and reactive-power sources Kh = nominal transformer tap ratio n max _ maximujn transformer tap ratio «™ m = minimum transformer tap ratio M = number of overloaded lines K = number of phase-shifters DSEA = decoupled security enhancement algorithm NLP = nonlinear programming method LP = linear programming method bij = series admittance of line i-j = series impedance of line /-/ = impedance matrix q

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Section: Comparison Of Methodsmentioning

confidence: 99%

Section: Static Security Control Via Phase Shiftersmentioning

confidence: 99%

Interactive security evaluation in power-system operation

Ekwue

Short

1983

IEE Proc. C Gener. Transm. Distrib. UK

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“…A policy of load shedding in power systems has been discussed by Hajdue (1968). Medicheria (1979Medicheria ( , 1981 and Chan (1979) proposed generation rescheduling or reallocation and load shedding to alleviate line overloads. Application of under-frequency relays for automatic load shedding has been studied by Lokay.…”

Section: Introductionmentioning

confidence: 99%

Optimal dynamic load shedding policy for generation load imbalances including characteristics of loads

Arini

1999

Int. J. Energy Res.

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“…1983]. Piecewise-linear objective functions are used for linear progranuning in the two papers coauthored by Chan [Chan ~ Schweppe 1979, Chan & Yip 1979.…”

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confidence: 99%

“…"':l load shedding is performed using linear or piecewise-linear [Chan & Schweppe 1979, Krogh et.al 1983 and quadratic [Hajdu et.al. 1968, Palaniswaoy et.al.…”

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confidence: 99%

An investigation of the solution to the optimal power flow problem incorporating continuation methods

Huneault

Galiana

1990

IEEE Trans. Power Syst.

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This thesis analyzès and tests some néw solution techniques for the optimal power flow problem.This new methodology exploits a parametric technique, callp-d the continuation method, which is applied to different tasks in the solution procedure. In a first application, th'e continuation method l solves the-quadratic subp:t;oblems generàted sequentially by the optimal power This thesis first presents an analysis of the various structures used in optimal power flow algorithms. Then, having chosen and presented the structure of our algorithm, we analyze the quadratic subproblems generated by this algorithm for sorne of its more important tasks: minimum cost, minimum losses and load shedding. New rules are proposed to link the solutions of successive subproblems to erwure the convergence of the nonlinear problem.Then, as a final contribution to the theory, some extensions are suggested for the subproblems: among them are ramp constraints, bus incremental costs, and ~ provisioml for redf'spatching.Numerical simulations of the proposed optimal power flow algorithm using the minimum fuel cast task were performed 'on four test systems. with sizes•

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A Generation Reallocation and Load Shedding Algorithm

Cited by 74 publications

References 4 publications

Interactive security evaluation in power-system operation

Interactive security evaluation in power-system operation

Optimal dynamic load shedding policy for generation load imbalances including characteristics of loads

An investigation of the solution to the optimal power flow problem incorporating continuation methods

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