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Incremental multivariable predictive functional control and its application in gas fractionation unit


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Incremental multivariable predictive functional control and its application in gas fractionation unit
Su Chengli1Shi Huiyuan1Li Ping1Wang Qian1Xu Na2
1.School of Information and Control Engineering,Liaoning Shihua University,Fushun 113001,China;
2.School of Electrical Engineering,University of Jinan,Jinan 250022,China
multivariable predictive functional control incremental model gas fractionation units
In view of that the effect of the traditional proportion-integration-differentiation(PID)control is not satisfying when it is used for the complicated process with multivariable characteristics and large time delay,an incremental multivariable predictive functional control(IMPFC)algorithm is proposed here.An incremental transfer function matrix model is set up through the step-response dates and predictive outputs are deduced with the theory of single point linear method.The incremental control variable is optimized,the constraint of the incremental control variable with the positional predictive functional control algorithm is rejected,and the control variable is made smoother.The predictive output error and future set-point are approximated by a polynomial to overcome the model mismatch and make the predictive outputs tracking the reference trajectory.The application in the gas fractionation unit shows that the proposed control strategy has good effect in tracking,robustness and disturbance rejection,and its control performance is superior to that of the PID control.


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Last Update: 2015-10-31