PURPOSE: To provide a control device for molten steel surface level in a mold in a continuous caster, by which the molten steel surface level in the mold can be stably controlled even in the case of inputting disturbance.
CONSTITUTION: In the control device 1 for molten steel surface level in the continuous caster 19, an identified signal generator 10 always gives periodical signal with the degree exeRting no adverse influence on the cast slab 16 to a command value for stopper opening degree obtd. based on the estimated flow rate gain K. By this method, as even in the case the control system is stable, the estimation operation of the above flow rate gain K, etc., is performed, even in the case of inputting the disturbance, the molten steel surface level can be stably controlled based on the flow rate gain K at this time. As the above flow rate gain K, etc., is estimated with the method of least squares in on-line, the optimum value for each is calculated. Therefore, by using the above flow rate gain K, etc., feed forward control can be executed.
OOMURA KAYAKO
AMO KYOICHI
