Nonlinear model predictive control of ultra-supercritical once through boiler-turbine unit
The coordinated control system (CCS) plays an import role in the operation of ultra-supercritical once-through boiler-turbine unit. To overcome the operating issues of the CCS, such as multivariable coupling, nonlinearity and large-time delay, a collocation method based nonlinear model predictive control is proposed in this paper. The dynamic optimization problem is transcribed into a finite dimensional nonlinear programming problem and solved using interior point-based large scale nonlinear optimization algorithm. Simulation results on a 1000MW ultra-supercritical once-through boiler-turbine unit show the effectiveness of the proposed approach.