Assessment of short circuit power and protection systems for future low inertia power systems

Fossil-fuelled power plants in Danish system will be phased out in the future, where majority of the electric energy will be supplied by renewable generation. The conventional power plants comprises large synchronous generators that are capable of supplying instantaneous short circuit power during faults to trigger system protections, while renewable generators mostly interface with the electric grids by converters, whose contribution during faults can be limited.
The project will model and evaluate the system’s short-circuit power level at critical lines and buses, incorporating the latest requirements for generation modules, for a future Danish scenario. The system requirements for short-circuit power will be quantified and the need for synchronous condensers can therefore be determined. The location and size of synchronous condensers in systems will be determined to fulfil the requirements for short-circuit power and the operation of protection systems.
The project will use real time digital simulator (RTDS) at PowerlabDK (http://www.powerlab.dk) to perform simulation and testing. The project is part of a Danish ForskEL project Application of Synchronous Condensers in Low Inertia Systems, grant no. 12196, funded by PSO (Public Service Obligation). This project will be in close collaboration with Siemens and Danish transmission system operator Energinet.dk.