Hello,
Let's say I have two PI controllers which control the same process variable y. The first PI controller (PI_1) uses action variable u_1 and the second one (PI_2) uses action variable u_2.
I would like to achieve a state when at first only the PI_1 influences the controlled variable y. In case the PI_1 alone is able to achieve y = y_set_point the PI_2 doesn't influence y. The PI_2 starts influence y (starts "helping" the PI_1) only in case the PI_1 alone isn't able to achieve y = y_set_point.
I have looked for some suitable control structure in the literature but it seems to me that neither the selector control nor the split range control are useful for my situation. Does anybody know a suitable control structure for my case?
Let's say I have two PI controllers which control the same process variable y. The first PI controller (PI_1) uses action variable u_1 and the second one (PI_2) uses action variable u_2.
I would like to achieve a state when at first only the PI_1 influences the controlled variable y. In case the PI_1 alone is able to achieve y = y_set_point the PI_2 doesn't influence y. The PI_2 starts influence y (starts "helping" the PI_1) only in case the PI_1 alone isn't able to achieve y = y_set_point.
I have looked for some suitable control structure in the literature but it seems to me that neither the selector control nor the split range control are useful for my situation. Does anybody know a suitable control structure for my case?