Abstract: Abstract Ancillary services are vital for ensuring a safe and uninterrupted operation of the power grid. Transmission System Operator is responsible for covering the losses in the power grid and for procuring appropriate levels of ancillary services. Ancillary services include frequency control, which can be divided into Frequency Containment Reserves, Frequency Restoration Reserves and Replacement Reserves. European project CROSSBOW, involves countries and Transmission System Operators from South-Eastern Europe and focuses on increasing grid f...
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