OPTIMIZATION OF BOILER CONTROL FOR IMPROVEMENT OF LOAD FOLLOWING CAPABILITIES OF EXISTING POWER PLANTS

摘要

An optimizing control system for improving the load following capabilities of power plant units has been developed. The system is implemented as a complement producing additive control signals to the existing boiler control system, a concept which has various practical advantages in terms of implementation and commissioning. The optimizing control system takes into account the multivariable and nonlinear characteristics of the boiler process as a gain-scheduled LQG-controller is utilized. Simulation results indicate that a reduction of steam temperature deviations of about 75% can be obtained.