An Optimized VSG Dynamic Response Control Strategy Based On Angular Frequency Feedforward

Damping control and inertia control play an important role in the Virtual Synchronous Generator (VSG) control, but with the development of distributed generation, the basic damping control and inertia control have been difficult to meet the requirements of grid to provide inertia support and frequency regulation functions for grid-forming inverters. In addition, the coupling of frequency regulation coefficient and damping coefficient makes it difficult for VSG to meet the target of frequency regulation and oscillation suppression at the same time. The goal of suppressing overshoot is opposed to the goal of improving power response speed. To solve these contradictions, a VSG control based on Angular Frequency Feedforward (AFF) is proposed in this paper. AFF - VSG control not only realizes the decoupling of droop coefficient and damping coefficient, but also significantly improves the power response speed of VSG, achieving fast power response and slow frequency response. In this paper, the Conventional VSG (Con-VSG) and AFF-VSG are deduced and compared in the grid-connected mode, and the simulation verifies the effectiveness and superiority of AFF-VSG.