基于稳定逆的直流炉机组协调控制系统前馈-反馈控制

Feedforward-Feedback Control of the Once-through Boiler-Turbine Coordinated System Based on Stable Inversion

为改善协调控制系统在机组运行过程中的控制效果,提出了基于直流炉机组非线性模型的前馈-反馈控制方法:首先通过合理简化,建立具有一定精度且适用于控制器设计的非线性模型,再引入稳定逆理论,求取该模型的稳定逆解,利用逆系统前馈控制使得机组输出迅速达到设定值附近,最后设计具有多个输出变量的反馈控制器,以消除外界扰动引起的跟踪误差.在不同的静态工作点下完成状态扰动与设定值扰动的仿真实验,并与基于状态反馈线性化的非线性内模结构的控制效果进行了对比.结果表明:基于稳定逆的前馈-反馈控制具有良好的设定值跟随能力.

To improve the control performance of once-through boiler-turbine coordinated system, a feed- forward-feedback control method was proposed based on the nonlinear model of once-through boiler-tur- bine unit, which is realized by. first establishing a nonlinear model with certain precision and suitable for controller design through reasonable reduction, next introducing the theory of stable inversion to seek in- verse solution of the model, then making the unit output reach around the set points quickly by feedfor- ward control via inversion system, and finally designing the feedback controller with multiple output varia- bles to eliminate tracing error caused by external interference. Simulation tests were carried out at state disturbance and set point perturbation under different static operation conditions, and the results were compared with the nonlinear internal model control method, which prove the feedforward-feedbaek control system based on stable inversion to have excellent set point tracing capability.