Load Frequency Controller system

Fingrid purchased a real time IT system to implement LFC functionality. The IT system have high reliability, IT security and performance requirements, comparableto SCADA / EMS systems. The IT system have both real time interfaces for signal exchange as well as time series interfaces for importing scheduled and order list information. The IT system perform following main functionality: • aFRR controller - a classical PI controller, creating control signal for aFRR from error signal FRCE (Frequency Restoration Control Error). • BSP management – a functionality to divide the aFRR control signal to several BSP’s (Balance Service Providers) based on merit order received via MOL processing • MOL processing – a functionality to import the MOL (Merit Order List) every MTU (Market Time Unit, 15 min), and define merit order for BSP functionality. • FRCE calculation – a functionality to calculate in real time the FRCE and signals required for PICASSO integrations based on real time measurements and schedules. • Schedule processing – a functionality to modify schedules received in MTU intervals to real time signals including ramping of signals between MTU’s. When Fingrid´s accession Picasso-project planning face progressed, a need for an additional functionality arised. Fingrid had no possibility to take this addition into account in the procurement process, as it was not expected at the time.