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 af-fecting 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 ap-plied in the synchronous VSG control loop,increasing the equi-valent damping of the system under transient conditions and thereby suppressing the power oscillation of the system.In ad-dition,the stability of the improved system was proved through the construction of the energy function.Finally,the effective-ness of the control strategy in suppressing system power oscil-lations was confirmed by simulation.
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