基于卡尔曼滤波器和多向核主元分析的发酵过程在线监测
首发时间:2011-12-30
摘要:针对发酵过程强烈的非线性和时变性特点,提出一种基于卡尔曼滤波器(KF)和多向核主元分析(MKPCA)的方法对发酵过程进行在线监控。该方法将三维数据空间按批次方向展开为二维数据空间并进行标准化,之后采用KPCA方法获取正常间歇过程的非线性特征,建立更为精确的过程监控模型。在新批次反应过程中利用卡尔曼滤波器对当前批次的未来测量数据进行实时估计从而实现在线监控。该方法和传统MPCA方法的监测性能在一个青霉素发酵仿真系统上进行了比较。仿真结果表明:该方法具有更好的监测性能,能有效获取过程变量之间的非线性关系,降低运行过程的误报率,且能较早检测出过程存在的故障。
关键词: 自动控制技术 多向核主元分析 卡尔曼滤波 发酵过程
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On-line Fermentation Process Monitoring using Kalman Filter and Multiway Kernel Principal Component Analysis
Abstract:A new method was developed based on kalman filter(KF) and multiway kernel principal component analysis(MKPCA) for on-line batch process monitoring. Three-way batch data of normal batch process are unfolded batch-wise. Then KPCA is used to capture the nonlinear characteristics within normal batch processes and set up the more accurate model of monitored process. The on-line monitoring uses a Kalman filter which can estimate the entire trajectory of the current batch run. Comparison of the monitoring performance of the method with that of the traditional multiway principal component analysis(MPCA) method on a benchmark fed-batch penicillin fermentation process shows that the proposed method had better monitoring performance, and that fewer false alarms and small fault detection delay were obtained. In both off-line analysis and on-line batch monitoring, the proposed approach can effectively extract the nonlinear relationships among the process variables.
Keywords: automatic control technology multiway kernel principal component analysis kalman filter fermentation
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