【摘要】 双层控制结构广泛应用于工业过程控制,针对实际系统中不确定性导致的性能下降和控制不可行的问题,提出一种事件触发的动态实时优化(Dynamic Real-Time Optimization,D-RTO)与模型预测控制(Model Predictive Control,MPC)双层结构.上层采用经济模型预测控制(Economic MPC,EMPC)对目标函数进行优化,计算最优参考轨迹并传给下层;下层采用MPC使系统跟踪上层轨迹;通过构建基于性能指标的事件触发条件来及时补偿不确定性造成的系统性能损失,无需等到D-RTO的下一次优化.当实际系统性能指标与上层优化的性能指标之差超出阈值时,需要重新求解EMPC,并基于当前状态更新参考轨迹.在此基础上,进一步分析了事件触发的D-RTO与MPC双层控制结构的可行性和闭环稳定性.数值模拟实验验证了方法的有效性.更多还原

【Abstract】 In this study,we propose a two-layered control framework integrating event-triggered dynamic real-time optimization(D-RTO)and model predictive control(MPC),addressing the issue of infeasibility and performance loss caused by uncertainties.The upper layer utilizes economic MPC(EMPC)to minimize an economic cost function,calculating reference trajectories.The lower layer utilizes MPC to steer the plant to track the reference trajectories.A triggering criterion based on cost function is proposed to compensate for performance loss in time,without waiting for the next D-RTO optimization.When the deviation between these two layers’ cost function exceeds a pre-set threshold,the EMPC is triggered to excute optimization and update the reference trajectory based on the current system states.Feasibility and closed-loop stability of the proposed two-layered control framework have also been proved.Simulations demonstrate its effectiveness.更多还原