IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
An Approximate Model for Analysis of Synchronous Machines (Part 2)
Junji TamuraIkuo Takeda
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1990 Volume 110 Issue 4 Pages 329-337

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Abstract

This paper presents a new approximate model for analysis of steam turbine synchronous generators. This new model is a set of fourth-order differential equations. Its variables are an internal phase angle, a rotation slip, a field flux linkage and a flux linkage of q axis damper circuit with large time constant. This model is an extended version of the third-order model for salient-pole type machines derived previously by the authors. The model has three important aspects as follows: 1) It includes two dynamic equations for rotor flux linkages in addition to a second-order equation of mechanical motion. 2) The output torque equation is derived by analyzing an asynchronous condition. 3) It is a non-linear model applicable to transient problems for large disturbances.
The accuracy of the new model is discussed for two conditions in this paper; that is, steady state and transient. At first, eigenvalues obtained from the linearized version of the new model are compared with the dominant eigenvalues obtained from the complete model (8th order model). As a result, it is shown that the new model is sufficiently accurate as a steady state model for small disturbances. Next, dynamic responses for several large disturbances calculated from the new model are compared with those obtained from the complete model. As a result, it is concluded that the new model is also very effective as a transient model for large disturbances.

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