蒸发过程的非线性控制仿真研究

On Nonlinear Control of Evaporation Process via Simulation

为了研究蒸发过程的非线性控制,对六效逆流蒸发系统的稳态工作点附近建立了动态模型,并将模型转化为仿射非线性系统的形式。接下来应用MIMO的GLC结构对这个非线性系统进行了输入输出线性化,对线性化后的系统应用PI控制律进行控制,并与常规的多回路PID控制做了对比。仿真结果表明,应用输入输出线性化控制策略消除了回路之间的耦合,能够更好地跟踪系统的设定值,并达到了节能降耗的目的。

The dynamic model is presented for the steady state operation point of six-effect countercurrent evaporation system.And then the model is converted to an affine nonlinear system.The nonlinear system is linearized through the input-output linearization technology based on the muti-input muti-output（MIMO） globally linearizing control（GLC） structure.PI control law is applied to the linearized system,and the comparation with conventional muti-loop PID control law is given.Simulation results show that the input-output linearization control strategy eliminates the coupling of each loop and can track the set point rapidly and efficiently.At the same time,the purposes of saving energy and reducing consumption are achiveved.