Reduced order models for synchronous machines

(1985) Reduced order models for synchronous machines. Masters thesis, King Fahd University of Petroleum and Minerals.


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The objective of this thesis is the development of reduced order models for generating units. A reduced order model can be considered as an equivalent if the differences between its outputs and the outputs of the complete (high order) model for the same inputs stay within acceptable error tolerance for a given period of time. That is to say, the equivalent will depend on (1) Inputs, (2) Outputs, (3) Period of simulation, and (4) Degree of acceptable accuracy. Several methods for model reduction are based on eigen value analysis of the linearized system of differential equations. One such method developed by Castro-Leon and El-Abiad utilizes input-output performance indices which are measures of modes controllability to given inputs and modes observability for given outputs. A thirteenth order model of a generating unit (2 for shaft, 5 for synchronous machine windings, 4 for the AVR-exciter and 2 for Governor-Turbine) is reduced to 1st, 2nd, 3rd, 4th and 5th order for different inputs and outputs. Also, 2nd, 3rd, 4th and 5th order classical models based on neglecting unwanted dynamic phenomena were derived and compared with the corresponding models obtained by mathematical reduction. The comparison showed that the mathematical reduced order models give better accuracies. A method is suggested to modify the parameters of the classical models in order to improve their accuracies to approach that of the mathematical reduced order models.

Item Type: Thesis (Masters)
Subjects: Electrical
Department: College of Engineering and Physics > Electrical Engineering
Committee Advisor: El-Abiad, A. H.
Committee Members: Abdel-Magid, Youssef L. and El-Amin, Ibrahim Mohammad
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 13:43
Last Modified: 01 Nov 2019 13:48