预测函数控制及其应用研究

介绍并分析了预测函数控制（PFC）的基本原理和特点，给出了一阶加纯滞后系统的预测函数控制的具体算法。将PFC和PID控制相结合，提出了PFC－PID串级主汽温控制策略。系统的内回路采用PID控制，内回路和主调节区对象构成PFC的广义被控对象，对广义被控对象进行拟合简化得到一阶加纯滞后对象，作为PFC的预测模型，算法简单；预测模型失配时，系统仍具有良好的控制品质，易于工程实现，具有较高实用价值。大量仿真实验表明，，采用PFC－PID串级控制策略的主汽温控制系统的动态品质明显优于采用PID串级控制策略的系统，具有较强的鲁棒性和抗干扰能力。

Predictive Functional Control and Its Application Study

The basic theory and properties of Predictive Functional Control (PFC) is introduced and analyzed, and the algorithm for first-order plus pure delay process is given out particularly. PFC-PID cascade control strategy is presented by combining PFC with PID control, and applied to main steam temperature control system in thermal power plant. Internal loop of the system adopts PID control strategy, and internal loop and the super-heater high temperature plant constitute generalized control plant of PFC. The control algorithm is simple because prediction model of PFC is first-order plus pure delay model which is gained by matching generalized plant. Furthermore, the system with unmatched model still has favorable quality. Therefore the strategy is easy to be realized in computer or distributed control system (DCS), and has hopeful application prospect. Many computer simulation results show that the advanced control strategy has more favorable dynamic characteristics than PID cascade control strategy in main steam temperature system, good robustness and disturbance rejection.