A partitioned state model of synchronous machines for simulation and analysis of power/drive systems
Abstract
In this research, a new model which can be used to portray the dynamic characteristics of synchronous or induction machines in power and drive systems has been developed. The model is expressed in voltage-behind-reactance form which is particularly useful when analyzing machine-converter systems. This model is similar in form to existing voltage-behind-reactance representations, however, no approximations are made regarding the rate-of-change in rotor variables. Although somewhat more complicated than existing approximate models due to the presence of a position-dependent stator resistance matrix, parameters are isolated which can be used to determine the effects of the approximations. This model is shown to be significantly more efficient than existing circuit-based machine representations. An example is provided which demonstrates a 1700% increase in simulation speed with no observable loss in accuracy. Furthermore, the stator and rotor equations are partitioned in such a way that multi-rate integration approaches may readily be applied when simulating switched power networks. Finally, new reduced-order models of the synchronous machine have been derived with potential application in the analysis of large-scale power systems. Examples are provided in which these models are shown to be more accurate and more efficient numerically than the standard reduced-order models in common use.
Degree
Ph.D.
Advisors
Wasynczuk, Purdue University.
Subject Area
Electrical engineering|Automotive materials
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