On-Line Operation of Phase Shifters Using Energy Control Centre Computers

Thanikachalam, A.; Sulzberger, V.T.; Olinda, P. Van; Wrubel, J.N.

doi:10.1109/tpas.1974.293887

Cited by 17 publications

(5 citation statements)

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“…(vi) The LP approach proposed has considerable advantages, in terms of speed and versatility, over the method described by Thanikachalam et al [19], which is characterised by a slow small-step search process.…”

Section: Discussion Of Resultsmentioning

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: Discussion Of Resultsmentioning

confidence: 99%

“…Step ( that may be involved [19]. Another assumption is that the variations in the tap settings are made over a small range; hence the voltage magnitudes remain unchanged.…”

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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“…The SUMT (sequential un-constrained minimization technique) [5][6] is used for solving the problem. The technique uses the problem constraints and the original objective function to form unconstrained objective function which is minimized by an appropriate unconstrained, multivariable technique based on McCormick's modification of the FletcherPowell method [13].…”

Section: Several Techniquesmentioning

confidence: 99%

“…In this paper the quadratic production cost function [6] Various different forms of the cost function f{(Lp) i ,(Lq) i } may be suitable for optimization [6], corresponding to the requirements and operating policies of various utility companies. However, the cost function may be greatly simplified without much loss.…”

Section: Objective Functionmentioning

confidence: 99%

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Computer Based Optimum Load Shedding Controller Using Unconstrained Minimization Technique (Case Study)

El-Sayed¹

2015

International Journal of Advanced Research in Computer and Comm

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Abstract:In this paper, the computerized controller for studying load shedding has been designed and implemented. This controller is designed based on the problem of minimizing load shedding during emergency conditions. The studied problem is formulated as a nonlinear static optimization problem subject to operational and equipment constraints. Suitable adjustments of control of generation rescheduling and control of phase shifting transformers before load shedding is determined and recommended. SUMT, solution algorithm adopting sequential unconstrained minimization technique is given. Results of application of the proposed technique to a 5 and 20-node network are presented. An overload relief policy is proposed to minimize load shedding.the proposed computerized technique have been presented in this paper.Applications to be IEEE -5 and 20 bus system are presented to validate the applicability of the proposed technique to any system of any size.

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New techniques for secure power system operation

Mohamed

Jasmon

1989

International Journal of Electrical Power & Energy Systems

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On-Line Operation of Phase Shifters Using Energy Control Centre Computers

Cited by 17 publications

References 1 publication

Interactive security evaluation in power-system operation

Interactive security evaluation in power-system operation

Computer Based Optimum Load Shedding Controller Using Unconstrained Minimization Technique (Case Study)

New techniques for secure power system operation

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