Umudike Journal of Engineering and Technology

Michael Okpara University of Agriculture, Umudike


DYNAMIC MODELLING OF EXCITATION AND GOVERNOR EFFECTON STABILITY OF ELECTRICAL MACHINES

Ukoima, K. N.
Department of Electrical & Electronic Engineering. Michael Okpara University of Agriculture, Umudike, Nigeria

Obi, P. I.
Department of Electrical & Electronic Engineering. Michael Okpara University of Agriculture, Umudike, Nigeria

Ezeonye, C. S.
Department of Electrical & Electronic Engineering. Michael Okpara University of Agriculture, Umudike, Nigeria



ABSTRACT

The performance of an electric system is characterized by the stability of the frequency and
voltage. To sustain electric performance, a governor is used to maintain the speed (and hence
frequency) of the generator at its nominal value. Another important factor in stability is the
excitation control. In this paper, a study of the effect of excitation and governor on the stability
of electric machines is presented. In particular, a model of a synchronous machine (in generator
mode) connected to a hydraulic turbine Proportional-Integral-Derivative (PID) governor with
excitation system is analyzed. A three phase fault is used to represent system disturbance. All
simulations were performed in simulink. Simulation results obtained shows that excitation and
governor control stabilizes the output terminal voltage of the synchronous electrical machine
within three seconds in the presence of a fault. This shows that excitation and governor control
play a vital role in the dynamic stability of electric machines.


Keywords: Electric system, Governor, Excitation, Synchronous machine, Stability, Generator


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Conference Code
IECON2019

Conference Title
ENGINEERING FOR SUSTAINABLE ECONOMIC DIVERSIFICATION, FOOD AND NATIONAL SECURITY

ISBN
978-978-53175-8-9

Date Published
Friday, September 20, 2019

Conference Date
2nd - 4th September, 2019

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