The electricity grid of the future will be supplied by 100% renewable energy generators. Most of these generators will be connected to the grid by electronic power converters, which gives rise to protection and control difficulties during disturbances. A solution to this problem associated with renewable-energy-based grids is to install synchronous condensers (SCs), which are synchronous generators without a prime mover. SCs therefore possess all the advantages of a synchronous generator during fault conditions and eliminate the protection issues that otherwise exist. The Danish project SCAPP, by collaboration between Siemens A/S and DTU, set out to investigate the characteristics of a renewable-energy-based power system and identify the requirements for synchronous condensers in the future.
The project is solely built on EMTP simulation of a renewable energy-based grid using RTDS and hardware in the loop (HiL) test incorporating the actual AVR system of a SC and protective relays of the SC and the grid. All the studies are based on RTDS and HiL simulation.
Guangya Yang • Technical University of Denmark