Abstract: During asymmetric grid faults, existing fault current limiting strategies struggle to constrain transient overcurrents in grid-forming (GFM) controlled renewable energy systems during both fault and recovery stages, compromising their ability to support the grid under severe disturbances. To address this challenge, this paper proposes a voltage-curve-based adaptive virtual impedance current limiting control strategy for fault ride-through (FRT). The method generates sequence-component virtual impedance values according to voltage sag characteristics while determining adaptive positive- and negative-sequence virtual impedance coefficients based on converter current withstand capability. This approach maintains the voltage source characteristics of GFM control while effectively limiting transient currents during fault and recovery phases within power device safe operating ranges, thereby enhancing renewable energy systems' grid support capability during FRT. Simulation and experimental validation conducted in PSCAD/EMTDC confirm the effectiveness of the proposed asymmetric FRT method.