Asymmetrical voltage sags in distribution grids cause smart microgrids to experience current over-limit, power angle instability, and active power fluctuations. Conventional Virtual Synchronous Generator (VSG) control fails to simultaneously achieve current limiting, power stabilization, and power angle recovery. This paper proposes an asymmetrical low-voltage ride-through strategy for VSG-based microgrids using a dynamic voltage reference. Firstly, phase and amplitude compensation are integrated into the sequence control, suppressing current surges and accelerating power angle recovery. Secondly, a dynamic voltage reference for the reactive loop is designed, adaptively adjusted based on post-fault active power, power angle, and grid voltage sag severity to maintain stability. Simultaneously, fuzzy PID control enhances the primary voltage regulation and feedforward compensation, enabling rapid and accurate tracking of the VSG internal voltage and active power setpoints and improving system voltage support and resilience. Finally, MATLAB/Simulink simulations validate the proposed strategy"s effectiveness.