Frequency control considerations for modern steam and combustion turbines

The increased sophistication of modern turbine and boiler control systems along with the emergence of a deregulated power industry have introduced new challenges in both the implementation of controls and the modeling of turbine response to power grid frequency excursions. Past modeling assumptions may no longer be valid when such aspects as steam supply pressure, coordinated boiler/turbine controls, and application (or nonapplication) of speed control loops are considered. This paper provides a summary of some of the discussion topics presented in this area regarding steam turbines, combustion turbines and combined cycle applications