Control method for the meniscus of a continuous casting mold

A control device for a continuous casting machine, wherein the control device is embodied in such a way that, in operation,

• to set the inflow of liquid metal into the continuous casting mold by means of a closure device and to withdraw the partially solidified metal strand from the continuous casting mold by means of a withdrawal device,
• to feed a measured actual value of the meniscus to a meniscus controller, which determines a target position for the closure device on the basis of the actual value and a corresponding target value,
• to feed the measured actual value of the meniscus to a disturbance variable compensator,
• to feed the target position for the closure device, a target position for the closure device corrected by a disturbance variable compensation value, an actual position of the closure device or an actual position of the closure device corrected by the disturbance variable compensation value to the disturbance variable compensator,
• to determine by the disturbance variable compensator the disturbance variable compensation value on the basis of values fed to it,
• to feed the target position corrected by the disturbance variable compensation value to the closure device,
• wherein the disturbance variable compensator comprises a model of the continuous casting mold, by means of which the disturbance variable compensator determines an expected value for the meniscus on the basis of a model input value,
• wherein the disturbance variable compensator comprises a number of oscillating compensators, by means of which the disturbance variable compensator determines an interference frequency component on the basis of a difference between the actual value and the expected value each relative to a related interference frequency,
• wherein the sum of the interference frequency components corresponds to the disturbance variable compensation value,
• wherein the model input value is determined by the relationship
• i=p′+z′
• wherein p′ is the uncorrected target or actual position of the closure device and z′ is a jump compensation value, and
• wherein the disturbance variable compensator comprises a jump determiner, by means of which the disturbance variable compensator determines the jump compensation value by integrating the difference between actual value and expected value.