Application of generalized predictive control in ultra-supercritical power plant based on structure analysis

When the coupling is strong and the compensation matrix is complicated, in order to simplify the compensation matrix, Gramian method is applied firstly. Secondly according to the compensation theory a generalized predictive control(GPC) algorithm based on similar-feed-forward compensation for the 3×3 system is discussed. Finally, the method was applied to a 1000MW ultra-supercritical(USC) boiler-turbine unit, and compared with conventional PID controller, GPC controller has better control performance. Simulation results show that GPC method can achieve smaller overshoot and shorter regulation time; furthermore it has a simpler structure and is easier to implement and tune.