CFBB燃烧过程变经济性能多目标预测控制

Multi-objective predictive control of CFBB combustion processes with changing economic criterion

针对具有非线性、耦合和约束等复杂特性的循环流化床锅炉(CFBB)燃烧过程,考虑经济性能指标可变情况下其多目标优化控制问题,提出一种变经济性能多目标经济模型预测控制(MPC)策略。为了保证经济性能指标发生改变后CFBB燃烧过程在稳态工况下的稳定性和燃烧经济性,首先引入关于最优经济稳态点的正定辅助函数作为最高优先级目标,其次考虑床温设定值跟踪目标和经济性目标。进一步,应用广义终端约束、字典序多目标优化和滚动时域控制原理,设计CFBB燃烧过程变经济性能多目标经济预测控制器。最后,通过仿真验证了本文提出策略的可行性和有效性。

Aiming at the combustion process of circulation fluidized bed boiler(CFBB)with complex characteristics such as non-linear,multivariable coupling and constraints,considering its multi-objective optimization control problem with changing economic criterion,a multi-objective model predictive control(MPC)strategy with changing economic criterion is proposed.In order to ensure the stability of the CFBB combustion process under steady-state conditions and the economy of combustion after the economic performance criterion changes,the positive definite auxiliary functions at the optimal economic steady-state points are introduced and viewed as the highest priority goal,and then the set-points tracking target of the boiler bed temperature and the goal of combustion economy are considered.Furthermore,applying the generalized terminal constraints,lexicographic multi-objective optimization and predictive control principles,a multi-objective model predictive controller with changing economic performance is designed for CFBB system.Finally,the feasibility and effectiveness of the strategy proposed in this paper are verified by simulations.