Abstract: Addressing the issue of microgrid voltage fluctuations caused by the high penetration of renewable energy sources, this paper proposes a voltage control strategy for the second-generation electric spring (ES-2) based on Model Predictive Control (MPC). Firstly, the operational principle of the ES-2 is analyzed, along with its operational characteristics in inductive, capacitive, and resistive modes. Secondly, a discretized predictive model for the critical load (CL) voltage is established, considering the structure of the full-bridge inverter and LC filter. By formulating a cost function aimed at minimizing the squared error of the critical load voltage, the optimal switching state is selected, thereby replacing the conventional pulse width modulation process. Finally, a simulation comparison is conducted on the MATLAB/Simulink platform. The experimental results indicate that, under grid-side voltage fluctuations and various operating conditions, the proposed MPC strategy exhibits a faster dynamic response compared to traditional PI control.