基于耗散理论的超超临界机组PID非线性协调控制研究

Research on PID Nonlinear Coordinated Control Based on Dissipative Theory for Ultra Supercritical Units

提出了一种新的超超临界机组PID协调控制器的设计方法,该方法以耗散理论为核心思想.首先建立超超临界机组非线性模型,将机组的工作点平移,简化机组模型,将积分项引入简化后的模型中,根据控制输入量和输出量的不同将模型分解为2个子系统,然后根据各个子系统具体情况采用不同的设计方法,最终构造出PID协调控制器,并将其应用到1 000MW超超临界机组中进行仿真验证.结果表明:该控制器具有良好的给定值跟随性和抗干扰性.

A new method was proposed to design a PID coordinated controller for ultra supercritical units, by taking dissipative theory as the core idea. Firstly, setting up the nonlinear mathematical model for ultra supercritical units, moving the working point of the units, simplifying the model, introducing integrals to the simplified model, and based on the difference between control input and output, the model was decom- posed into two subsystems. Then a PID coordinated controller was constructed using different design methods according to specific situations of each subsystem, which was applied to a 1 000 MW ultra super- critical unit for verification and simulation. Results show that the controller has good effects in given value tracing and disturbance rejection.