矿仓料位过程控制不稳定性分析及其改造

摘要

某烧结厂混合料矿仓料位的过程控制采用Smith预估器纯滞后补偿系统,在系统运行过程中,当矿仓料位发生较大变化时,混合料矿仓出现严重的过程控制不稳定问题.文章分析了混合矿仓料位过程控制滞后的原因,采用反馈改进型Smith预估器纯滞后补偿新方法,以ABB公司的控制器为平台,构建了新的纯滞后补偿控制系统,有效地克服了纯滞后和外因扰动引起的料位波动问题.实际应用表明,该系统具有控制可靠性高、鲁棒性好和抗干扰能力强等优点,解决了烧结厂混合料矿仓料位的过程控制不稳定问题.%In one mixture ore of sintering plant, process control of material level for ore bin used Smith predictor time delay compensation system. In running process of the system, when material level changed in large, serious instability of the process control appeared. The paper analyzed causes of delay for process control of mixed ore bin, and adopted a new compensation method of time delay which used a modified feedback Smith predictor.Taking ABB's controller as platform, a new time delay compensation control system was built, which overcome the time delay effectively and fluctuations caused by external disturbance. The practical application showed that the system has high control alibility, good robustness, and good anti-interference ability and resolves instability of process control of the mixture ore bin of sintering plant.