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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]

It is important to investigate the effect of wind power plants on electric power system operation when the wind power energy proportion is increasing in Lithuania. In this paper, the dependence of frequency and cross-border power interchange deviations on wind power plants' operation in the Lithuanian electric power system is presented; the most suitable load frequency control algorithms and the composition of power plants participating in control are proposed. [ABSTRACT FROM AUTHOR]