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为解决重介选煤控制系统中重介悬浮液密度与液位调节过程的大滞后与强耦合问题,建立了悬浮液密度与液位控制系统的数学模型,并在对系统进行解耦的基础上,提出了一种重介悬浮液密度与液位PFC-PID控制算法。该算法采用闭环控制方法对密度与液位加以控制,即内环采用常规PID控制技术对解耦后的系统加以控制,以稳定系统;外环采用预测控制技术,将由PID控制组成的内回路作为外环控制的广义预测对象,解决了大滞后问题。仿真结果表明,该控制算法具有超调量低、调节时间短、静态误差小的特点,且具有很好的抗扰能力,控制效果整体优于传统PID控制。
In order to solve the big lag and the strong coupling problem of density and liquid level adjustment process of heavy medium and coal control system, a mathematical model of the density and liquid level control system of the suspension was set up, and the basis of the system decoupling On the above, proposed a heavy medium suspension density and liquid level PFC-PID control algorithm. The algorithm uses closed-loop control method to control the density and liquid level, that is, the inner loop uses the conventional PID control technology to control the decoupled system to stabilize the system. The outer loop adopts the predictive control technology, and the inner loop composed of PID control is taken as Outer ring control of the generalized forecast object, to solve the large lag problem. The simulation results show that the proposed control algorithm has the advantages of low overshoot, short adjustment time and small static error, and has good anti-interference ability. The control effect is better than the traditional PID control.