Control method of grid closed loop operation impact current

The invention relates to the technical field of grid control and specifically relates to a control method of a grid closed loop operation impact current. The control method includes the following steps that a closed loop operation switch and a system display interface are arranged according to real-time grid operation data section, and a recording way is provided; a dispatcher records a line protection current setting value, and system checking is performed; if a reasonable loop can not be searched, the fact that a loop closed way is unreasonable is prompted, and resetting is performed; if reasonable loop information can be searched, phase checking is performed, unreasonable reasons are prompted if the checking doesn't pass, loop closed topological information and display are observed if the checking passes, and then click calculation is performed; admittance matrixes are used to obtain loop closed port impedance, initial tidal current of online grid data is calculated, injection volumes of loop closing point