Addressing the challenge of rapid fault identification and selective protection has imposed entirely new demands on the fault-response capability of inverters within the system. For this end， this paper proposes an improved space vector modulation （SVM） strategy for active distribution network inverters to ensure the stable operation of the power grid. Leveraging the mathematical equivalence between SVM and sinusoidal pulse width modulation （SPWM），the zero-sequence component generation mechanism is reconstructed. The method suppresses negative-sequence currents in steady-state operation to prevent false tripping， while dynamically boosting their output during fault transients to quickly meet protection detection thresholds and improve fault feature discrimination. Under asymmetric faults， negative-sequence currents not only help fault characterization but also support accurate fault location. The proposed strategy satisfies the speed and selectivity requirements of relay protection with reduced computational burden. Experimental results verify that it shortens protection action time， enhances the reliability of grid fault detection， and improves the coordination and cooperation between active distribution network inverters and relay protection devices in grid fault identification， thereby supporting the stable operation of active distribution networks.