Steel plant control device
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorMinoru Tachibana
Life of this patent
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Abstract
A steel plant control device includes a subtractor, a PI controller, a first-order lag controller, and an adder. In a band that is lower than a first frequency f1, a gain of the PI controller is higher than a gain of the first-order lag controller; in a band from the first frequency f1 to a second frequency f2, the gain of the first-order lag controller is higher than the gain of the PI controller; and in a band that is higher than the second frequency f2, the gain of the PI controller is higher than the gain of the first-order lag controller.
Claims2
A steel plant control device, comprising:
- a subtractor that outputs a deviation between a target value and a control variable, the control variable being fed back from a control object;
- a PI controller that receives an input of the deviation and outputs a first manipulated variable for reducing the deviation by using a proportional action and an integral action;
- a first-order lag controller that outputs a second manipulated variable, the second manipulated variable being obtained by multiplying the deviation by a proportional gain and further multiplying by a first-order lag element;
- and
- an adder that outputs to the control object a final manipulated variable, the final manipulated variable being obtained by adding the second manipulated variable to the first manipulated variable;
- wherein, in a band that is lower than a first frequency, a gain of the PI controller is higher than a gain of the first-order lag controller;
- in a band from the first frequency to a second frequency that is higher than the first frequency, the gain of the first-order lag controller is higher than the gain of the PI controller;
- and in a band that is higher than the second frequency, the gain of the PI controller is higher than the gain of the first-order lag controller, and
- wherein the band from the first frequency to the second frequency is a band that causes load change and characteristic change of the control object after the deviation converges to zero.
A steel plant control device, comprising:
- means for subtracting that outputs a deviation between a target value and a control variable, the control variable being fed back from a control object;
- PI control means for receiving an input of the deviation and outputting a first manipulated variable for reducing the deviation by using a proportional action and an integral action;
- first-order lag control means for outputting a second manipulated variable, the second manipulated variable being obtained by multiplying the deviation by a proportional gain and further multiplying by a first-order lag element;
- and
- means for adding that outputs to the control object a final manipulated variable, the final manipulated variable being obtained by adding the second manipulated variable to the first manipulated variable;
- wherein, in a band that is lower than a first frequency, a gain of the PI control means is higher than a gain of the first-order lag control means;
- in a band from the first frequency to a second frequency that is higher than the first frequency, the gain of the first-order lag control means is higher than the gain of the PI control means;
- and in a band that is higher than the second frequency, the gain of the PI control means is higher than the gain of the first-order lag control means, and
- wherein the band from the first frequency to the second frequency is a band that causes load change and characteristic change of the control object after the deviation converges to zero.
Dependencies are inferred from the claim text.