Impact of Inverter Control Strategies on Frequency Stability in Grid-Connected Systems

Abstract

The growing integration of RE sources like solar photovoltaics (PV), Wind energy etc. presents challenges to grid stability due to their inherent lack of inertia. This inertia traditionally helps maintain grid frequency during sudden changes in power demand or supply. This work investigates the impact of RES on grid stability and explores methods for improving frequency response in solar inverters. The paper focuses on advanced control strategies like grid-forming control and virtual inertia. It discusses a concept of Virtual Synchronous Generators (VSG), a novel approach that imitates the actions of traditional synchronous generators in order to increase grid stability by introducing virtual inertia. Additionally, the paper discusses mathematical modeling and simulation techniques used to assess frequency stability, including conventional methods that analyze the complex interactions between inverters and the power grid.