机炉协调控制的分散PID整定

Tuning of decentralized PID controllers for coordinated boiler-turbine control

设计适合于火电单元机组的机炉协调控制系统,有利于提高热工过程的自动化水平。采用双输入双输出(TITO)分散PID控制器的设计方法,应用于火电单元机组的机炉协调控制中,获得相应的控制系统。基于Nyquist稳定性判据和对角优势分析,通过适当的预补偿措施求得极限增益和极限频率,并利用Tyreus-Luyben方法整定PID控制器参数。通过仿真对比试验,显示了该控制系统具有满意的动态性能,以及较强的鲁棒性和抗干扰能力。

It is important to automation of thermal processes to design appropriate coordinated boiler-turbine control systems. A design methodology was developed for decentralized PID controllers in coordinated boiler-turbine control systems. The approach was based on an analysis of Nyquist stability, Gershgorin bands, and diagonal dominance. With a suitable precompensator, the ultimate gain and ultimate frequency of each loop can be calculated. The tuning rule can be used to design simple decentralized PID controllers. Simulation results illustrated the dynamic performance, the disturbance rejection and the robustness of the control system.