METHOD FOR OPERATING A GAS AND STEAM TURBINE INSTALLATION FOR FREQUENCY SUPPORT

摘要

A method for operating a gas and steam turbine system having a gas turbine, a steam turbine and a waste heat steam generator is provided herein, wherein steam for the steam turbine can be generated in the exchange of heat with exhaust gas from the gas turbine. Absorption capacity of the steam turbine can be increased and pressure in the waste heat steam generator can be lowered to utilize storage reserves in the waste heat steam generator for increased generation of steam to assist the frequency in the power system starting from a steady-state operating mode. Thermal energy is fed to the waste heat steam generator wherein a power profile of the gas and steam turbine system is greater than or equal to a preceding power level of the steady-state operating mode to increase the absorption capacity of the steam turbine and reduce pressure in the waste heat steam generator.

主权项

1. A method for operating a gas and steam turbine installation, having a gas turbine, a steam turbine and a waste heat steam generator, in which steam for the steam turbine can be generated by heat exchange with exhaust gas from the gas turbine,
wherein the method comprises, for frequency support in the power grid, starting from steady-state operation, increasing the absorption capacity of the steam turbine and decreasing the pressure in the waste heat steam generator in order to use storage reserves in the waste heat steam generator for increased steam generation, and supplying heat energy to the waste heat steam generator at such a rate that, as a consequence of increasing the absorption capacity of the steam turbine and decreasing the pressure in the waste heat steam generator, a power profile of the gas and steam turbine installation is greater than or equal to an immediately previously available power of the steady-state operation.