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为确保控制器输出在其允许的物理限制范围内和克服进料流速波动对期望浓度响应的影响,针对连续搅拌槽反应釜(CSTR)系统,采用了一种出口浓度控制和进料流速估计的算法,这种简单的控制策略考虑到作为输入变量的冷却剂流速的有界属性,借助自适应观测器得到进料流速和系统状态。由于考虑了进料流速波动的影响,所提策略对实际生产中由于设备长期运行造成的进料管内污垢的累积导致的流速降低、调节阀或传感器故障导致的流速扰动等具有较强的适应性,同时自适应观测器的输出也可对设备的健康诊断提供技术支持,为非线性过程控制对象的控制、检测和诊断的一体化提供了一种选择。通过Matlab仿真验证了算法的有效性,结果表明控制器和自适应观测器参数整定简单,具有很好的稳定性和鲁棒性。
To ensure controller output is within its allowable physical limits and to overcome the effect of feed rate fluctuations on the desired concentration response, a continuous stirred tank reactor (CSTR) system was employed with an outlet concentration control and feed flow rate estimate Algorithm, this simple control strategy takes into account the bounded nature of the coolant flow rate as an input variable, with the aid of an adaptive observer to get the feed flow rate and system state. Considering the influence of the fluctuation of feed flow rate, the proposed strategy has strong adaptability to the decrease of flow rate due to the accumulation of dirt in the feed pipe caused by the long-term operation of the equipment and the flow disturbance caused by the fault of the regulating valve or the sensor in actual production At the same time, the output of adaptive observer can also provide technical support for the equipment’s health diagnosis, providing an option for the integration of control, detection and diagnosis of nonlinear process control objects. The effectiveness of the algorithm is verified by Matlab simulation. The results show that the parameters of controller and adaptive observer are easy to set, which have good stability and robustness.