System Strength and Dynamic Voltage Recovery of Power Grids with High Penetration of LSPV Plants

Abstract

This research investigates the impact of high levels of large-scale photovoltaic (LSPV) power plant penetration on dynamic voltage stability. Verified LSPV plant model has been utilised to capture its behavior and system strength at various penetration levels with the impact of inverter-based loads on dynamic voltage stability. Moreover, it develops a reliable global dynamic voltage stability assessment index and proposes effective countermeasures to alleviate the detrimental impacts of LSPV plants. The countermeasures includes a data- driven approach considering full voltage trajectory and involving various dynamic interactions to allocate dynamic VAr source to secure system strength with higher penetration of LSPV plants.