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While using the instrumentation control system at the Ignalina NPP, some short-time jumps of the coefficient of linear load margin values were indicated. These jumps were not related to the operational regime changes and were caused by errors in estimating the coefficient of energy production unevenness. The common form of energy production has two similar local maximum values. A change of global maximum location causes short-time jumps of the coefficient of linear load margin, even though the maximum value change is negligible. This paper deals with the analysis of the calculation algorithm and the identification of possible modifications that can prevent random short-time jumps. The reasons for these disturbances are identified, and algorithm improvements are introduced and verified. The improved calculation algorithm is verified using existing databases of the I & C system and the test runs on the reserve I & C system at the Ignalina NPP. [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]