The Influence of the Excitation Control Law Integral Component on the Synchronous Generator Stability Conditions
DOI:
https://doi.org/10.24160/0013-5380-2026-8-29-40Keywords:
integral control, automatic excitation control, stability, electric power system, voltage regulationAbstract
The article presents the results of studying the stability conditions of a synchronous generator equipped with an automatic excitation controller (AEC) operating with an integral voltage control law. The relevance of the study is stemming from the need to perform a fundamental analysis and formalize the applicability limits of classical control laws in modern power systems, which are characterized by variation of their dynamic parameters. To analyze the system stability, methods such as characteristic equation root analysis, the D-partitioning method, and the Mikhailov stability criterion were applied. The condition under which the system retains small-signal stability was taken as the main criterion. The permissible ranges of the integral controller tuning parameter values have been obtained. A relationship between the tuning parameter limit value and the power transmission angle, as well as the exciter time constant, has been established. The electrical operation mode and stability parameters under the disturbances corresponding to those applied during AEC certification testing have been analyzed. It has been found that the integral control law boundaries depend essentially on the possible contingencies in the power system and the type of excitation system used. The dependencies of the AVR integral control law limit tuning parameter value corresponding to maintaining the small signal stability on the power transmission angle for different values of the exciter time constant have been determined.
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