基于LS-SVM逆系统的焦炉集气管压力系统内模控制

焦炉集气管压力是炼焦生产过程中重要的工艺参数,其值是否稳定,直接影响到煤气质量、焦炉寿命、焦炭质量和生产环境。针对焦炉集气管压力系统是一个强干扰、非线性和多变量耦合的复杂系统,采用LS-SVM辨识出焦炉集气管压力系统的逆系统模型,并将其串联在原系统之前,运用逆系统的方法将集气管压力系统解耦成2个相互独立的单输入单输出伪线性子系统。同时,对解耦后的系统采用非线性内模控制策略以保证系统的鲁棒性和稳定性。仿真和应用结果表明该控制策略的解耦控制效果较好,提高了系统的快速调节能力和跟踪精度,而且增强了系统的鲁棒性,可以保证焦炉集气管压力稳定在现场工艺要求的范围内。

Internal model control of gas collector pressure in coke ovens based on LS-SVM inversion

Gas collector pressure is an important parameter in the process of coking production, because the stable pressure directly affect gas quality, life of coke oven, coke quality and the production environment in coke oven. By cascading the inverse system of the gas collector pressure in coke oven identified by LS-SVM with the original one, we decoupled the system of gas collector pressure into two independent pseudo-linear subsystems of SISO according to the characteristics of the gas collector pressure system in coke oven, such as strong external disturbances, non-linear and coupling relations, etc. Meanwhile, an internal model controller was introduced into the two subsystems to guarantee their robustness and stability. Simulation and application results show that the control strategy has good decoupling features, and improve the rapidity, tracking accuracy and robustness of the system. And the gas collector pressure can be controlled in reach the desired technology range.