The real test of black-start capacity and island operation in east part of Slovakia
The defense and restoration plans development is a part of a transmission system operator’s responsibilities and requires thorough calculations, simulations and publication of instructions. The plans focus on extensive failures that have a heavy impact on the system operation and could lead to a black-out. To restore the system after such fatal failure generation units that can start-up without outside help are essential. This ability is fairly ease to check. The units are certified regularly and represent black-start ancillary services for transmission system operator (TSO). However, the only way to check the practical applicability of the restoration plan as a whole is to test it in parallel with normal operation of the rest of the system. This process is called the real black start test and this paper concerns itself with one such test in Slovak power system. Specifically thermal power plant EVO1 starting from pump-storage power plant Ružín and island operation with available loads followed by synchronization to power system that was done on October 27th, 2016. Black-start test was done according to the schedule without significant problems and with a successful synchronization of the island with the rest of the Slovak system working in synchronously connected continental Europe, which verified the readiness and feasibility of restoration of Slovak power system within Slovakia in case of occurrence of black-out failure.