Patent ID: 11936189
Assignee: SIEMENS ENERGY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A method of controlling frequency in a power grid, the method comprising:
operating a gas turbine to power a first generator that is synchronized to the power grid, the gas turbine including a first control system having a first droop setting;
directing an exhaust from the gas turbine through a heat recovery steam generator (HRSG) to generate high pressure steam;
directing the high-pressure steam through a steam turbine to power a second generator that is synchronized to the power grid, the steam turbine including a second control system having a second droop setting;
setting the second droop setting to a value based at least in part on an available MW margin of the steam turbine; and
periodically calculating the first droop setting based at least in part on the MW margin of the gas turbine, the second droop setting, and a plant required total droop for the combination of the gas turbine and the steam turbine.