Abstract: Compared with the working principle of traditional series compensation, the Static Synchronous Series Compensator (SSSC) simulates line reactance by injecting a voltage component orthogonal to the line current into the circuit, thereby altering line parameters. This method effectively reduces the risk of resonance and expands the compensation range. This paper first establishes the mathematical model of the SSSC in the synchronous rotating d-q coordinate system. Subsequently, a dual closed-loop control strategy and SPWM control technology are employed to optimize system performance. Finally, verification is conducted through simulation. The results demonstrate that the proposed SSSC simulated impedance control method can effectively adjust line impedance parameters, fully validating the effectiveness of the control strategy.