Undisturbed switching method between 9H-stage combined cycle unit and booster units

The invention discloses an undisturbed switching method between a 9H-stage combined cycle unit and a booster unit. The undisturbed switching method comprises the following steps that firstly, the pressure requirement of a gas turbine inlet for natural gas and technical parameters of a booster need to be determined; under the pressure condition that the natural gas pressure range of an inlet of a fuel module of a gas turbine is the minimum value or is lower than the minimum value, the allowable minimum pressure of an outlet of the supercharger is deduced reversely, the minimum buffer volume under the corresponding condition is calculated, and then the calculated minimum buffer volume is optimized and reduced; setting an implementation scheme of the buffer volume according to the optimized buffer volume; and finally, potential influence factors of undisturbed switching of the supercharger are considered and optimized or adjusted, the specific implementation scheme comprises a pipe capacity buffering scheme and