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In the future, the Lithuanian electrical power system will have to contribute to the secondary automatic load and frequency control. While performing control in which thermal power plants participate, additional losses related with the non-stationary operation of power plant equipment appear. In the paper, the methodology of estimating the dependency of the thermal power plant block (an aggregate of 300 MW) efficiency coefficient on its load variation magnitude and frequency while operating in control regime is presented. Calculations presenting the solution using spectral analysis tools are carried out. [ABSTRACT FROM AUTHOR]

Currently many developed mathematical models of electrical power systems (EPS) are designed for calculation of short transient processes lasting about ten minutes, however, in these models load and frequency control algorithms, load variations and wind farm operation generally aren't fully estimated, and the models that estimate these factors are designed for inaccurate calculations. In the paper, a mathematical model of an electrical power system in which wind power farms operate is presented. It enables to analyse long transient processes while estimating wind power plants operation, load variation and various load and frequency control algorithms. [ABSTRACT FROM AUTHOR]