Abstract
The design and tuning of power system stabilizers (PSS) and automatic voltage regulators (AVR) of synchronous generators is usually performed using low-order two-axis models. Remarkable robust characteristics and systematic construction can be obtained with the recent developments on linear and nonlinear control theory. However, the properties and performance of the control designs are also evaluated using low-order equivalent-circuit models because large synchronous machines are not readily available to designers and researches. This may lead to doubts about the controller behavior under true operating conditions. The main objective of this work is to show that robust control designs, obtained with small order models, keep their good performance characteristics when applied to the actual machine. In order to circumvent the lack of the real machine, a very detailed finite-element model is developed to represent turbine generators connected to large power systems. The numerical model incorporates simulation of rotor motion, iron magnetic nonlinearity and eddy currents in the solid rotors of turbine generators. The control design is performed using constructive nonlinear control, which gives a systematic controller construction coupled to a simple tuning scheme.
Published Version
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