Optimization and Application of a Multiplier Coordinated Predictive Function Control Method for (Ultra) Supercritical Thermal Power Units

To improve the coordinated control performance of (ultra) supercritical thermal power units, a multiplier predictive function control method was proposed, while an optimal control law was designed for the multiplier predictive function with disturbance signals, and subsequently the predictive function control system and the optimized coordinated control method were applied for the control of related main and superheated steam temperatures. Taking the turbine valve instruction and coal feeding instruction as disturbance signals of the steam pressure control system, the water supply optimization instructions were obtained through calculation and then applied in the whole system after feedforward signals were superimposed; with the water supply instruction used as disturbance signal of the superheated steam temperature control system, the coal feeding orders were optimized and acted on the whole system after feedforward signals were superimposed. Results show that for the three-in-three-out supercritical unit, the method proposed can effectively solve the coupling problem in the system, and its control performance has been proved to be excellent by actual engineering applications.