Aiming at an industrial DMF recovery plant, a kind of region expert coordination control system (RECCS) based on expert inference mechanism was proposed.With an S7-300 PLC based distributed control architecture, the expert control system can identify the operation states of regions from coupling data of the plant.The regional PID controllers were coordinated with the expert coordinating rules to realize plant-wide automation of the DMF recovery process.Simulation results on distillation models illustrated the effectiveness of the coordination control system.Easily integrated with DCS,the proposed expert region coordination control technique could be widely used in industrial applications.
在化工过程中,90%以上的控制器类型为PID类型,对PID控制器进行性能评价具有重要的实际意义。PID控制器的性能评价多以理论计算的最小方差作为基准,但由于控制器受自身结构的限制,实际上根本无法达到这个数值。提出采用PID控制器能够达到的最小方差作为标准,来评价常规操作下的PID控制器性能,使得PID控制器性能评价结果具有实际意义。在求取PID可达最小方差过程中根据输入输出数据拟合ARMAX过程模型,采用SOS(Sums Of Squares)方法解决了非凸优化问题,保证了全局最优解。将该方法应用在TE(Tennessee-Eastman)过程仿真平台上,实验结果表明了其有效性和实用性。
