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Journal ArticleDOI

Digital Computer Study of the Resynchronizing of a Turboalternator

About: This article is published in Transactions of The American Institute of Electrical Engineers. Part Iii: Power Apparatus and Systems.The article was published on 1960-04-01. It has received 2 citations till now. The article focuses on the topics: Power-system protection & Fault detection and isolation.
Citations
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Journal ArticleDOI
01 Apr 1963
TL;DR: In this article, the authors describe the development of a mathematical model which includes many of the features normally neglected in conventional network-analyser and digital-computer studies, such as mechanical and electrical damping, flux variations, iron saturation and saliency, and also permits the inclusion of voltage-regulator and governor action.
Abstract: The present trends in power-system design cause a continual reduction of the stability margins of generators connected to the British Grid system. This is due, primarily, to the changing characteristics of the turbo-generators, and, for this reason, the need has arisen for an accurate generator model for use in stability studies of future systems.The paper describes the development of a mathematical model which includes many of the features normally neglected in conventional network-analyser and digital-computer studies. The model includes mechanical and electrical damping, flux variations, iron saturation and saliency, and it also permits the inclusion of voltage-regulator and governor action. By solving the equations on an analogue computer, the accuracy of the mathematical model is assessed by comparison with test results obtained on a 30 MW turbo-generator. Recommendations are then made for improving the model.

91 citations

01 Jan 1968
TL;DR: Using the mathematical model, the behaviour of a synchronous machine with brushless excitation, during asynchronous operation and resynchronization has been studied on a digital computer.
Abstract: A mathematical model has been developed, for the simulation of a synchronous machine with brushless excitation. The model also includes the simulation of Turbine Governor connected to the synchronous machine. The model consists of a set of simultaneous non linear first order differential equations in the generalised form suitable for the study of transient and steady state operation of a synchronous machine. Using the mathematical model, the behaviour of a synchronous machine with brushless excitation, during asynchronous operation and resynchronization has been studied on a digital computer. Necessary digital programs for the study have been developed. R eproduced with perm ission o f the copyright ow ner. Further reproduction prohibited w ithout perm ission.
References
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Journal ArticleDOI
TL;DR: In this article, the analysis presented in a previous paper is extended to include a consideration of synchronizing and damping torque during continuous and transient oscillations, the description of an equivalent circuit which has been found useful in calculating the decrement of the short circuit current of interconnected machines, and the derivation of simple approximate formulas for the roots of the equation determining the wave shape of the current on three-phase short circuit.
Abstract: The analysis presented in a previous paper is extended to include a consideration of synchronizing and damping torque during continuous and transient oscillations, the description of an equivalent circuit which has been found useful in calculating the decrement of the short circuit current of interconnected machines, and the derivation of simple approximate formulas for the roots of the equation determining the wave shape of the current on three-phase short circuit.

320 citations

Journal ArticleDOI
TL;DR: In this article, a new treatment of eddy-current phenomena in solid iron and other ferromagnetic alloys based upon a suggestion by A. G. Ganz is presented. But the authors assume that the material is assumed to have infinite permeability at zero field intensity, with zero incremental permeability for all field intensities different from zero.
Abstract: THIS ARTICLE presents a new treatment of eddy-current phenomena in solid iron and other ferromagnetic alloys based upon a suggestion by A. G. Ganz.1 The new treatment is developed logically, beginning with the familiar problem of eddy currents in an infinite region of constant permeability, bounded by a plane surface where excitation is applied. The concepts of phase shift and damping always associated with the space distribution of eddy currents found in this problem are extended to the case in which a ferromagnetic material is used. This material is assumed to have infinite permeability at zero field intensity between positive and negative saturation induction, with zero incremental permeability for all field intensities different from zero. A field theory consistent with the Maxwell theory and preserving the concepts of phase shift and damping is evolved for the assumed material.

68 citations

Journal ArticleDOI
TL;DR: In this paper, a digital-computer method for transient stability analysis of synchronous and induction machines is presented, based on representation of the connecting power network by its admittance constants, and its accuracy is verified by application to a simple system having two synchronous machines, two induction motors, three fault busses and two shunt loads.
Abstract: Methods are presented for determining the transient stability of systems of synchronous and induction machines. Treatment of the induction machine by its inertia and a voltage back of transient reactance makes possible its representation in stability studies by an a-c network calculator or digital computer. A digital-computer method for transient-stability studies is outlined, based on representation of the connecting power network by its admittance constants. Synchronous and induction machines are treated as in the a-c network calculator studies. The method is illustrated and its accuracy verified by application to a simple system having two synchronous machines, two induction motors, three fault busses, and two shunt loads. A complete derivation of the admittance method is included in the paper as well as accuracy criteria for the admittance constants.

21 citations

Journal ArticleDOI
01 Nov 1954
TL;DR: The design features of a 10-kc network analyzer are described in which computing elements are incorporated in the feedback loop which relates the electric power output with the phase shifter in such a way that a dynamic representation for a transient-stability solution can be directly obtained on the analyzer itself.
Abstract: IN USING the conventional a-c network analyzer to solve transient-stability problems, it is necessary to resort to a step-by-step process which is both time-consuming and tedious although the power flow data can be obtained at each step directly from the analyzer. The subject of the rapid evaluation of system swing curves has recently attracted the engineering interest and needs the attention that it now seems to be receiving. This paper describes the design features of a 10-kc network analyzer in which computing elements are incorporated in the feedback loop which relates the electric power output with the phase shifter in such a way that a dynamic representation for a transient-stability solution can be directly obtained on the analyzer itself.

3 citations