Positive sequence break variable directional element performance optimization method and related device

The invention discloses a positive sequence break variable directional element performance optimization method and a related device, which are applied to a three-phase symmetric fault, and are characterized in that firstly, the weak feedback characteristic of a current converter is utilized to deduce the amplitude-phase relationship of the positive sequence voltage of a fault point in different fault scenes, and the mapping relationship of the amplitude and the phase of the positive sequence voltage at the fault point is constructed; then, the weak feedback characteristic of the converter is utilized again, based on the mapping relation between the fault point positive sequence voltage amplitude and the phase, the mapping relation between the positive sequence voltage amplitude and the phase at the protection installation position and the converter control point is calculated, and according to the converter control strategy, the mapping relation between the positive sequence current amplitude and the phase at