Sub-Synchronous Resonance (SSR) in Series Compensated Networks with High Penetration of Renewable Energy Sources

Abstract

This paper investigates the correlation between sub-synchronous resonance (SSR), its management onwards and the increase in renewable energy penetration levels in power grids. Future trends, problems and opportunities that arise within a changing power system adapting to ever increasing renewable energy sources (RES) integrations are discussed. Renewable energy integrations come with devices comprising power electronics that do not contribute synchronous inertial response to the power system grid. The paper presents theory of the types of SSR, both old and emerging ones and introduces methods of analyzing SSR. A review of the prevalent SSR management techniques and results over the years is shown. A correlation study is tabled and implemented in DlgSilent-Powerfactory with sample results presented. The simulation results showed that integration of more renewable energy sources has a direct effect of increasing SSR. Different renewable technologies e.g. wind and photovoltaic solar result in different SSR occurrences.