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为了克服大型火电机组汽包型锅炉生产过程中存在的非线性强和指令响应慢的缺点,构造了一种非线性串级控制结构:外控制环以主汽压力为控制对象,将其控制器输出作为汽包压力设定值;内控制环则依据汽包压力与其设定值的偏差的大小调节锅炉的供给燃料量.仿真表明:与PI控制相比,在本设计系统的控制下,主汽压力的动态响应速度更快、超调量更小;当主汽压力受到0.1MW外扰作用及模型失配20%的情况时,非线性串级控制系统仍具有良好的大范围升、降负荷指令跟踪性能和稳定性.
In order to overcome the shortcomings of strong non-linearity and slow command response in the large-scale thermal power unit drum-type boiler production, a non-linear cascade control structure is constructed: the outer control loop takes the main steam pressure as control object, and its controller The output is set as the drum pressure set value.The inner control loop adjusts the boiler feed fuel quantity according to the deviation between the steam drum pressure and its set value.The simulation shows that compared with PI control, under the control of this design system, The dynamic response of steam pressure is faster and the overshoot is smaller. When the pressure of main steam is affected by 0.1MW external disturbance and the model is mismatched by 20%, the nonlinear cascade control system still has a good range of lifting and lowering load Instruction tracking performance and stability.