Intelligent control of power-plant main steam pressure and power output

An intelligent hierarchical control strategy has been proposed and successfully applied to a 300 MW boiler-turbine unit, i.e. Unit 1 of Yuanbaoshan Power Plant in China. For the strong couplings between control loops of main steam pressure and power output, a new design for decoupler aimed at decoupling for setpoints and unmeasured pulverized coal disturbance of the system at the same time is presented. For the variation of operating condition and slowly varying dynamics, a intelligent control scheme has been developed by integrating fuzzy self-tuning with adaptive control and auto-tuning techniques. Satisfactory industrial application results show that such a control system has enhanced adaptability and robustness to the complex boiler-turbine process, and better control performance and high economic benefit has been achieved.