Reheat Steam Temperature Control of Power Plants Based on Integral Gain Scheduling Under Renewable Energy Integration

This paper focuses on the control of reheat steam temperature (RST) systems for ultra-supercritical power plants via integral gain scheduling with more and more renewable energy integrated into the power grid. By analyzing the open-loop responses under different conditions and the nonlinearity of the RST system, the necessity of integral gain scheduling is explained. By calculating the stable regions of PI controller parameters, the rationality and reliability of integral gain scheduling are illustrated. Next, simulations under different conditions without/with random load disturbance are carried out to verify the effectiveness of the proposed PID controller. Finally, the robustness analysis further verifies the ability of the proposed PID controller to cope with large-scale variable operating conditions.