Abstract
New energy sources, storage facilities, power electronics devices, advanced and complex control concepts, economic operating doctrines, and cost-optimized construction and production of machines and equipment in power systems adversely affect small-signal stability associated with local oscillations. The objective of the article is to analyze local oscillations and the causes that affect them in order to reduce their negative impact. There are no recognized analyses of the oscillations of modern operating synchronous generators exposed to new conditions in power systems. The basic idea is to perform a numerical analysis of local oscillations of a large number of synchronous generators in the power system. The paper represents the local mode data obtained from a systematic analysis of synchronous generators in the Slovenian power system. Analyzed were 74 synchronous generators of the Slovenian power system, plus many additional synchronous generators for which data were accessible in references. The mathematical models convenient for the study of local oscillations are described first in the paper. Next, the influences of transmission lines, size of the synchronous generators, operating conditions, and control systems were investigated. The paper’s merit is the applicable rules that have been defined to help power plant operators avoid stability-problematic situations. Consequently, boundaries were estimated of the eigenvalues of local modes. Finally, experiments were performed with a laboratory-size synchronous generator to assess the regularity of the numerically obtained conclusions. The obtained results enable the prediction of local oscillations’ frequencies and dampings and will be useful in PSS planning.
Highlights
New energy sources, storage facilities, power electronics devices, advanced and complex control concepts, economic operating doctrines, and cost-optimized construction and production of machines and equipment in power systems adversely affect small-signal stability associated with local oscillations
The basic idea is to perform a numerical analysis of local oscillations of a large number of synchronous generators in the power system
Since small-signal stability is directly related to local oscillation modes, we first conducted a detailed study of the local oscillations of synchronous generators in the Slovenian power system
Summary
As part of our regular work, we have to investigate in detail the small-signal stability of the Slovenian power system. - As the demand for energy grows, modern power systems are operated close to the ultimate transmission capability, which can lead to a critical situation [3] For these reasons, synchronous generators in modern power systems are much more sensitive to disturbances in the power system (damages, faults, errors) that cause natural oscillations to become unstable. Consequences of elevated stability problems are observed clearly in an increasing number of significant power system blackouts in recent years. Most frequently encountered small-signal stability problems are from the class of local oscillation modes [4] This is the reason why the detailed results of the research of local modes are presented in the article
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