EID-estimation-based periodic disturbance rejection for sintering ignition process with input time delay.

*(English)*Zbl 1398.93078Summary: Sintering plays a key role in generating blast furnace burden in metallurgical processes. The continuous production and stable quality of sintering significantly depends on the stable and precise control of sintering ignition, which, however, is achieved through an input time delay system, and suffers from different and unknown disturbances. To reject disturbances and enhance the control precision of ignition temperature, this paper introduces a modified Equivalent Input Disturbance (EID)-based disturbance compensation that is suitable for controlling sintering ignition. First, the periodic properties of disturbances induced by gas pressure fluctuations are obtained based on spectral density decomposition. Second, to obtain the dynamics of sintering ignition, an iterative subspace modeling method is developed, which estimates not only the model parameters but also the length of time delay. By considering the periodic property, a control structure of sintering ignition based on the modified EID-based compensation is proposed, in which an additional time-delay element is designed to make the phase difference between EID estimation and real disturbance close to zero. Finally, the validity of the proposed method is verified by a simulation.

##### MSC:

93B35 | Sensitivity (robustness) |

93B30 | System identification |

90B30 | Production models |

93C15 | Control/observation systems governed by ordinary differential equations |

93C83 | Control/observation systems involving computers (process control, etc.) |

93C73 | Perturbations in control/observation systems |