MULTIVARIABLE STABILIZER FOR A MULTIMACHINE PLANT
Date
1978-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
In recent years attention has been paid to the design of auxiliary controllers which, acting through the excitation control system, improve the dynamic stability of individual generators. In this thesis this concept is extended to the multimachine plant and a multivariable controller is designed that acts on all the machines at the same time to improve the overall stability of the plant.
A simple linearized model for the multimachine plant is developed by extending the well known Heffron-Phillips model of a synchronous generator. This model is advantageous from a conceptual point of view, since it provides a greater degree of physical insight into the machine interaction phenomena. It also provides a sound basis for multivariable controller design.
A multivariable stabilizer for the plant is designed using Modal Control Theory. A new design technique is developed combining existing multi-input modal control methods. This new technique gives lower controller gains and more uniform distribution of the control effort among the machines.
Simulation results are reported which demonstrate that the controller designed increased the damping of the intermachine oscillations considerably even when a detailed nonlinear model of the machines is used to simulate the plant. This proves that the controller designed is a realistic alternative for the stabilization of the plant.
Description
Keywords
Citation
Degree
Master of Science (M.Sc.)
Department
Electrical Engineering