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DIRECTIONS OF DISTURBANCES AND MODELING ERRORS ON THE CONTROL QUALITY IN DISTILLATION SYSTEMS |
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| Authors: | Kazuyuki Shimizu Masakazu Matsubara |
| Affiliation: | a Chemical Engineering Department, Nagoya University, Chikusa Nagoya, Japan |
| Abstract: | The effect of directions of disturbances and modeling errors on the control quality was studied with the aid of singular vectors. It is shown that the material balance type of control structure can handle larger size of set point changes than the conventional type of structure in almost all the directions of set point changes. On the other hand it is shown that the latter can handle larger size of feed disturbances than the former in large portion of the directions The effect of modeling errors in the relative volatility and the stage efficiency on the robustness was discussed focusing on their directions. It is shown that the column with the high condition number of 57 remains stable even when both parameters were 10° in error Computer simulations were carried out to ascertain the results obtained. |
| Keywords: | Singular vector Multivariable control Distillation control Robustness |
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