Short-circuit current calculation method and device

The invention discloses a short-circuit current calculation method and device, and the method comprises the steps: obtaining the injection current increment of a controlled current source model located at a node j in the nth iteration based on equipment element parameters, tidal current current and the three-sequence voltage of the node j obtained through the (n-1) th iteration, obtaining injection current increment, positive sequence mutual impedance and open-circuit voltage of a controlled current source model located at a node j based on the nth iteration and the (n-1) th iteration; successively obtaining a generalized equivalent voltage source located at a node i in the nth iteration, a short-circuit current of a short-circuit point i, three-sequence voltages of all nodes in the nth iteration and a maximum value of absolute values of three-sequence voltage variations of all nodes in the nth iteration; and based on the magnitude relationship between the maximum value of the absolute values of the three-seq