SINCRO.GRID is a smart grid project of the two transmission system operators (TSOs) HOPS from Croatia and ELES from Slovenia. With SINCRO.GRID, the two TSCNET shareholders are responding to the increasing lack of flexibility and reactive power in the transmission system, which in Croatia and Slovenia, as in many parts of Europe, results from the increasing integration of decentralised, volatile renewable energy sources (RES). Two distribution system operators (DSOs) from the respective countries are also involved in the European Project of Common Interest (PCI). The aim of the project partners is to optimise grid efficiency via advanced technologies and innovative data processing, including compensation devices, a dynamic thermal rating system, a battery power storage system, and a virtual cross-border control centre.
As HOPS reports, an important step has been taken towards the establishment of the binational SINCRO.GRID control centre, whose prime task is to integrate reactive power compensation devices in Croatia and Slovenia into a joint operation to fully exploit their synergy potential. The centre will thus enable voltage control and loss optimisation in transmission systems, better control and forecasting of electricity generation from RES, and the participation of RES in the provision of ancillary services.
On 30 September 2020, the SINCRO.GRID Q-U system with Volt Var Control (VVC) function was operated for the first time in fully automatic closed loop for four hours without any human intervention. All calculated VVC data were automatically sent by the Q-U system to seven transformers in three HOPS substations, optimising the transmission network in north-western Croatia. After successful testing in fully automatic mode, the test was continued in semi-automatic mode with transformers and two generators in one power station. The information and experience obtained from the test run will be used for the further analysis of the Q-U system and its application to the whole Croatian transmission system and finally for the implementation of the HOPS-ELES virtual cross-border control centre.