Method and device for adjusting high exhaust pressure through medium-pressure adjusting valve

The invention discloses a method and device for adjusting high exhaust pressure through a medium-pressure adjusting valve. The method comprises the steps that safety boundary conditions of automatic control of the medium-pressure adjusting valve are obtained, and the safety boundary conditions comprise the highest opening degree of the medium-pressure adjusting valve, the upper limit value of the exhaust steam pressure of a high-pressure cylinder and the lower limit value of the exhaust steam pressure of the high-pressure cylinder; According to the safety boundary conditions, high exhaust pressure closed-loop control is conducted by adjusting the opening degree of the medium-pressure adjusting valve, so that the exhaust steam pressure of the high-pressure cylinder in a unit is adjusted, main steam in the unit sequentially passes through a high-pressure main steam valve and the high-pressure adjusting valve to flow into the high-pressure cylinder to do work, and exhaust steam of the high-pressure cylinder sequ