QP-DMC算法在重介液密度控制中的应用

Application of QP-DMC Algorithm in the Heavy Medium Suspension Density Control System

由于重介选煤过程中重介悬浮液密度及合介桶液位控制中的相互耦合作用,使得采用PID/人工控制效果不理想。为解决该问题,通过飞升曲线法分别建立清水阀、分流阀及加介阀开度对重介液密度及合介桶液位的阶跃响应模型,采用基于二次规划约束优化算法的动态矩阵(QP-DMC)控制器,以清水阀、分流阀及加介阀开度作为三个控制量,重介液密度及合介桶液位作为两个被控量,实现对重介液密度及合介桶液位的联动控制。通过MATLAB进行仿真,结果表明:该控制算法可以使重介液密度及合介桶液位在100s达到稳定值。

Because of the mutual coupling between heavy medium suspension density control and liquid level of qualified medium barrel control in heavy medium coal preparation pracess,the effect of PID or artificial control is not ideal.To solve the problem,the ascending curve method is adopted to establish respectively the step response models of the opening degree of clear water valve ,flow divider and qualified medium valve to heavy medium suspension density and liquid level of qualified medium barrel.The dynamic matrix controller based on quadratic programming constrained optimization algorithm （ QP-DMC ） is adopted to realize the linkage control of heavy medium suspension density and liquid level of qualified medium barrel, which sets the opening degree of clear water valve ,flow divider valve and qualified medium valve as three controlled variables and the heavy medium suspension density and liquid level of qualified medium barrel as two dependent variables.The MATLAB simulation shows that the control algorithm can make the heavy medium suspension density and liquid level of qualified medium barrel reach their stabilizing values in about 100s.