Simulation of two cases steam turbine with synchronous generator during the switching into its self-consumption supply

This paper describes control of two cases steam turbine with synchronous generator which is switched into its self-consumption supply. The frequency in an electrical grid is stated on nominal value which is in the Union for the Coordination of the Transmission of Electricity (UCTE) grid 50 Hz. When deviation of the frequency is higher than 0.2 Hz, the switching of particular steam units into the island operation is only the chance how to maintain the supply of, at least, some small grids. The other possibility how to keep power units in operation, to be prepared for the next synchronization to the grid, is to switch them to operation status in which they supply only their self-consumption. This change of the operating state is the most dynamic load change for the control system of the unit. Simulation of switching of the turbogenerator into its self-consumption is examined in MATLAB Simulink software.