Analysis of Frequency Response of Synchronous Machines Using the Magnitude Data

Over the past two decades, frequency response tests have become widely accepted as an alternative for determination of synchronous machine parameters. As a machine equivalent circuits move towards the high order models, designers need to analysis the performance and characteristics of the frequency response tests data. A major benefit of frequency response tests allows a more accurate modelling for the direct and quadrature axis. The normal approach is to use numerical curve-fitting techniques to match the measured data with the initial estimates time constants.
Due to the difficulty of estimating the higher order models, this thesis project is undertaken to design and implement the time constant extraction using an analytical method. This task can be divided into two steps: Firstly, the research into current methods used for determining the both axes equivalent circuit parameters. Secondly, development of the mathematical model was to be performed using theoretical analysis and then implement the design into the simulation program using the MATLAB software. The design program will only focus on the magnitude data of the step response. This program did not require an intimate understanding of the system order to be develop but utilized only the step response of the system.

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http://innovexpo.itee.uq.edu.au/2001/projects/s804279/thesis.pdf