The real test of Vojany power plant self-consumption restoration after a black-out
The defense and restoration plans development is a part of the TSO responsibilities and requires thorough calculations, simulations and publication of instructions. The plans focus on extensive failures that have a heavy impact on a 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, which are able to start up independently after black-out are certified regularly and represent black-start ancillary services for 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 power plant Vojany1 self-consumption start test. The test showed a capability of the Vojany self-consumption to be restored with the use of power provided from pumped storage hydro power plant Ružín in case of black-out failure. Alongside, conclusions of the analyses done before the test, mainly in the field of voltage optimization in the island were confirmed which is a significant contribution to the increase dispatch centres in Slovak electricity system readiness to deal with system restoration. Also, the necessity of optimal protection settings on individual elements was showed (normal operation versus restoration after black-out).