Automatic control steady-state undisturbed switching method for desulphurization booster fan

The invention discloses an automatic control steady-state undisturbed switching method for a desulphurization booster fan. According to the method, a controlled quantity is switched and selected flexibly, and a corresponding set value is tracked and set through an object transmission function; furthermore, the openness of a guide blade of a draught fan is used as a feedforward signal; the parameter optimization proportioning is realized by using a segmental polygonal function; and undisturbed adjustment of a static blade or a movable blade of the booster fan can be well realized by setting a proportion parameter. A unit runs securely and stably by rationally adjusting the controlled quantity and the feedforward signal of the booster fan. Under the secure running of a desulphurization system, the desulphurization efficiency of the unit can be guaranteed; desulphurization is automatically performed, so that the unit can generate power securely and stably; therefore, the labor intensity of an operator is reduced