With the rapid development and high penetration of renewable energy, it is becoming more important that renewable generators, including doublyfed induction generator (DFIG), participate in the frequency regulation of the power grid. However, the rotorside converter (RSC) of DFIGs usually had relatively small current limitations, which could be exceeded during frequency regulation. A novel rotor current performanceguaranteed virtual synchronous controller for DFIGs was proposed. Firstly, the DFIG model was analyzed and a current control model was developed. Then, using an error transformation function and Lyapunov synthesis, a performanceguaranteed controller was proposed to strictly guarantee the rotor current within the predefined bounds. Thus the proposed controller could well deal with the frequency regulation demand and the current limitation. Finally, the effectiveness of the controller was verified via simulations. The enhanced rotor current control effect brought by performanceguaranteed control was also examined.