Impacts of VSG Control on Frequency Response in Power Systems with High-Penetration Renewables

With the increase of renewable energy into power systems, the system inertia continuously decreases, which poses challenges to the existing frequency regulating strategy. To improve system frequency response in the low-inertia system, Virtual Synchronous Generator (VSG) has been proposed in the literature. This paper investigates the VSG frequency response model and verifies the implementation at large scale. First, the frequency response model of VSC is investigated. In addition, the frequency response performance of the conventional synchronous generator (SG), the renewable power plant, and the renewable power plant with VSG are compared under different penetration levels of renewable energy. The simulation results show the capability of the CURENT Large-scale Testbed (LTB) for real-world, large-scale power system simulation in future scenarios and indicate that VSG-configured renewable power plants can provide the power grid with adequate frequency regulation ability under high renewable energy penetration.