Method for controlling periodic fluctuation of liquid level of medium-low carbon steel crystallizer

The invention discloses a method for controlling the periodic fluctuation of the liquid level of a low-carbon and medium-carbon steel crystallizer, which comprises the following steps of: acquiring the liquid level data of the crystallizer and the current data of each driving roller, and carrying out differential processing on the liquid level data and the current data; when the fluctuation value of the liquid level data exceeds a preset fluctuation value, a target driving roller is determined, and the fluctuation trend of the current data of the target driving roller is the same as the fluctuation trend of the liquid level data; the correlation coefficient of the current data of each driving roller and the current data of the target driving roller is calculated, a to-be-adjusted driving roller is determined, and the correlation coefficient of the current data of the to-be-adjusted driving roller is larger than or equal to a preset coefficient; and reducing the preset distance of the roller gap of the fan-sha