Adaptive control strategy of inertia and damping coefficients based on virtual synchronous generator

Abstract

Virtual synchronous generator (VSG) has been generally concerned in the field of new energy power generation because of their ability to imitate the operational mechanism of synchronous generator. In order to solve the problem of power and frequency fluctuation or even off-limit caused by load changes, this paper summarizes the control strategy for the stable operation of the electricity grid supported by VSG. It combines the changes of various physical quantities in the transient process. It fully uses VSG virtual inertia and damping coefficient flexible and regulable advantages and puts forward an adaptive control strategy for inertia and damping coefficient. The control strategy can efficiently suppress the fluctuation of VSG output power and frequency in dynamic processes. It can cut down the transient adjustment time significantly and promote the stability of the system. The correctness and effectiveness of the proposed control strategy are verified by simulation experiment results.