PID-DMC算法及其在液位控制系统中的应用.docVIP

PID-DMC算法及其在液位控制系统中的应用 摘 要 预测控制具有超前、大范围预测的特性，这使得它在所有控制思想和策略中成为一个非常引人注目的亮点，给大迟延、大惯性过程控制带来希望，因而成为目前的高级控制算法研究中的一大热点。基于此，本论文提出了一种新的带PID校正环节的DMC算法，通过与传统的PID控制和DMC控制相比较，在论述其原理的基础上，将其应用于实际液位控制系统，实现了系统在模型失配明显的情况下对一阶，二阶液位对象的有效控制。由于控制阀的非线性特性使得本实验中的液位对象具有时滞弱非线性，常规DMC算法控制存在明显的模型失配问题并影响了系统的控制性能。为此在常规DMC算法中引入PID环节，从而得到了一种新的PID-DMC算法。通过MATLAB仿真，得出的实验结果表明：该算法能有效改善系统在模型失配情况下的控制性能，并且算法简单易行，在线计算量小。 关键词：液位控制系统，动态矩阵控制，模型失配，PID-DMC算法 PID-DMC Algorithm and its Application to the Waterlevel Control System Abstract The forecast control has in advance, the wide range forecast characteristic, this causes it becomes an extremely noticeable luminescent spot in all controls thought and the strategy, for the big delay, the big inertia process control brings the hope, thus becomes present in a senior control algorithm research big hot spot. Based on this, the present paper proposed one kind new brings PID to adjust the link the DMC algorithm, through compares with the traditional PID control and the DMC control, in elaborates in its principle foundation, applies it in the actual fluid position control system, has realized the system in the model unbalance obvious situation to the first order, two steps fluids position object active control. Because the control valve nonlinear response enables in this experimental the fluid position object to have the time lag small nonlinearity, the conventional DMC algorithm control existence obvious model unbalance question and has affected the system control performance. Introduces the PID link for this in the conventional DMC algorithm, thus obtained one kind of new PID-DMC algorithm. Through the MATLAB simulation, the experimental result which obtains indicated that, This algorithm can effectively improve the system in model unbalance situation control performance, and the algorithm easy and feasible, on-line compute the quantity is small. Key words：Fluid position control system; Dynamic matrix control; Model unbalance; PID-DMC algorithm 目 录 摘 要 I Abstract