<p>Controlling the superheated steam temperature (SST) is essential for the safe and efficient operation of combined cycle power plants, but it has become challenging due to frequent load variations and safety requirements. Traditional PI controllers may struggle to provide optimal performance because of nonlinearity, time delays, and disturbances, particularly under wide-ranging load conditions. In this paper, we propose a new feedforward gain-scheduling cascade control strategy that compensates for time delays while ensuring stable SST without complicating the control system. The method incorporates a well-defined feedforward control mechanism into a gain-scheduling PI structure, enabling quick adjustments of the water spray control valve to prevent SST overshoots during sudden power fluctuations. A stability analysis is included, and the proposed strategy has been simulated and implemented at two real combined cycle power plants in Iran, demonstrating its effectiveness in maintaining smooth temperature control and enhancing power output without adding complexity or cost to the system. We successfully implemented the proposed structure at Pareh-Sar in Gilan, Iran, and Parand in Tehran, achieving a temperature peak reduction of up to 5 degrees, which ultimately leads to an increase in power production in the steam cycle of approximately 2 MW for each steam turbine.</p>