网络控制系统中的时戳预测函数控制

Time-stamped predictive functional control in networked control systems

传统预测函数控制算法不能有效处理网络控制系统中的随机延迟,为此提出了时戳预测函数控制算法.该算法使用时间戳来估计由网络引入的控制延迟,在预测系统未来输出时明确考虑了该延迟,然后借鉴传统预测函数控制算法的基本策略,得到了适用于网络控制系统的控制规律.进一步由TrueT im e工具箱搭建了网络控制系统仿真平台,对比了时戳预测函数控制算法和传统预测函数控制算法.仿真结果表明随着网络引入延迟的增大,时戳预测函数控制算法给出控制品质明显优越于传统预测函数控制算法.

Conventional predictive functional control （CPFC） algorithm cannot deal with random delays in networked control systems （NCS）. To solve this problem, the time-stamped predictive functional control （TSPFC） algorithm is proposed. TSPFC uses time-stamp to estimate the network-induced control delays, which are specifically considered for predicting the future plant outputs, and then the control law that applies to NCS is derived based on the basic strategy of CPFC algorithm. Furthermore, a networked control system based on TrueTime toolbox is constructed, on which the proposed TSPFC algorithm is compared with CPFC algorithm. The simulation results show that TSPFC algorithm gives much better Control performance than CPFC algorithm when the network-induced delays are increased.