Automatic pressure control method and system for reactor thermal hydraulic transient test system

The invention discloses an automatic pressure control method and system for a reactor thermal-hydraulic transient test system, and relates to the technical field of reactor thermal-hydraulic transient system tests, and a reactor thermal-hydraulic transient system test loop is connected with a pressure stabilizing system loop comprising a pressure vessel; the proportion of steam and liquid in the steam pressure stabilizer is changed by adjusting the power of the electric heating element, so that the pressure of a test loop of a reactor thermal hydraulic transient system is changed, and the pressure of a first test loop of the reactor thermal hydraulic system is automatically controlled; program setting can be carried out in measurement control software of a system test, automatic adjustment of transient test pressure is achieved, and the pressure is made to return to a safe range. When the water level in the steam pressure stabilizer does not meet the requirement, the water level is automatically adjusted; the