Research on PFC-PID control algorithm of density and liquid level in heavy medium suspensio
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摘要: 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，将内环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。Abstract: In order to solve problems of big lag and strong coupling of density and liquid level of heavy medium suspension in heavy medium coal preparation control system, a mathematical model of density and liquid level control system of heavy medium suspension was established and PFC-PID control algorithm of density and liquid level in heavy medium suspension was put forward on the basis of decoupling the system. Closed-loop control method is adopted to control density and liquid level, namely, PID control technology is used to control decoupled system and make the system stable in inner loop, and PFC control technology is used to solve problem of delay in outer loop, inner loop is taken as generalized prediction objects of outer loop. The simulation results show that the control algorithm has characteristics of low overshoot volume, short setting time and small static error and good ability of anti-interference, and has better control effect than traditional PID control technology.
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