Method and system for evaluating destructive power of high-altitude electromagnetic pulse to power system

The invention discloses a method and system for evaluating destructive power of a high-altitude electromagnetic pulse to a power system, and the method comprises the steps: obtaining electromagnetic stress through the coupling analysis of a high-altitude electromagnetic pulse HEMP environment E1 component and a functional assembly; obtaining effect intensity; comparing the electromagnetic stress and the effect intensity corresponding to each functional component, determining the state of each functional component, and determining the equipment state according to the state of each functional component; generating an initial fault scene of the power system according to the equipment state, carrying out cascade fault analysis, and determining an intermediate state of the power system after the E1 component acts; based on the intermediate state, geomagnetically induced current and transformer reactive power generated by the power system after the E3 component of the HEMP environment acts on the power system are d