Power Oscillation Suppression Strategy for Multi-VSGs Based on Synchronous Virtual Damping

In the event of external disturbance to a power grid consisting of multiple virtual synchronous generators (VSGs), power oscillations may arise among the VSGs, potentially affecting system stability. Aiming at this problem, a multi-VSG power oscillation suppression strategy based on synchronous virtual damping was proposed. A transfer function model of the multi-VSG system was established to analyze the primary causes behind power oscillation. According to the proportional-differential characteristics of the power droop, the synchronous virtual damping was deduced. The mathematical model was applied in the synchronous VSG control loop, increasing the equivalent damping of the system under transient conditions and thereby suppressing the power oscillation of the system. In addition, the stability of the improved system was proved through the construction of the energy function. Finally, the effectiveness of the control strategy in suppressing system power oscillations was confirmed by simulation.