【摘要】 燃煤锅炉蒸汽压力控制系统中存在大惯性、大滞后及随机扰动,采用常规PID控制及Smith预估控制等方法难于有效实现精确控制。考虑到预测控制是解决大滞后、大惯性系统问题的最佳选择,且其中的动态矩阵控制算法建模相对简单,具有较强的鲁棒性,难点仅在于参数的整定,因此采用动态矩阵控制算法对燃煤锅炉的蒸汽压力回路进行控制器设计,同时引入基于误差的反馈校正策略克服实际控制中存在的干扰,并根据前人对基于一阶惯性加滞后模型参数整定方法的研究,结合实际调节经验,实现了参数整定。最后在某厂主蒸汽压力为1.25 Mpa的燃煤锅炉下进行实际验证,结果表明了动态矩阵控制提高了蒸汽压力控制的稳定性并保证了安全性。更多还原

【Abstract】 Large inertia, large time-delay and random disturbance exist in the control system of coal fired steam boiler. The traditional methods, such as PID and Smith state estimation are difficult to achieve accuracy control. Considering that prediction control is the best choice for the system with great inertia and lag, and the dynamic matrix control(DMC) algorithm which belongs to prediction control is easy and robust, and the parameter tuning is the only difficulty, DMC algorithm is chosen to fulfill the controller design of the control loop for the coal fired boiler steam pressure. Simultaneously, the feedback compensation strategy is employed to overcome the interference in practical control, and the parameters of the controller are tuned according to the forefathers’ knowledges of parameter setting based on the first order inertia and lag system model, the optimal parameters are obtained. Finally, experiments are implemented on the coal fired boiler in factory, whose main stream pressure is 1.25 Mpa. The result indicates that the safety and stability are improved by dynamic matrix control.更多还原