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为有效提高大范围变工况时单元机组的负荷适应能力,克服非线性特征对系统运行性能的影响,该文基于反推法,针对一个典型的锅炉–汽轮机单元非线性模型,经过工作点的坐标平移、模型的适当简化,将其分解为2个具有一个相同控制输入的子系统,对于各个子系统,通过合理选择虚拟控制变量,逐步构造出偏差信号的李亚普诺夫函数,进而设计出非线性机炉协调控制器,并将其转换为PID控制器形式。针对某500MW锅炉–汽轮机单元进行的仿真试验表明,基于反推PID方法的协调控制器具有良好的给定值跟随性、抗干扰性、负荷适应性和鲁棒性。
In order to effectively improve the load adaptability of unit unit in a wide range of variable conditions and to overcome the influence of nonlinear characteristics on system performance, based on the backstepping method, a typical boiler-turbine unit nonlinear model is adopted. Coordinate translation and proper simplification of the model, and decompose them into two subsystems with one same control input. For each subsystem, the Lyapunov function of the deviation signal is gradually constructed by reasonably selecting the virtual control variables, The linear furnace controller coordinates and converts it to PID controller form. Simulation tests on a 500MW boiler-turbine unit show that the coordinated controller based on the backstepping PID method has good set-point following, anti-jamming, load adaptability and robustness.