Abstract
In conventional power systems, synchronous machines determine the system frequency due to virtue of their electromechanical coupling. The replacement of conventional synchronous generators by environmentally-friendly, inverter based renewable energy solutions such as solar and wind generation systems, can lead to frequency stability issues. This is because the overall system rotational inertia is reduced as the share of inverter based renewable technologies increases. This paper presents an analysis of the effects on system frequency dynamics, specifically on the inertial response and Rate of Change of Frequency (RoCoF), due to increased penetration of Renewable Energy Sources (RES). This paper presents an analysis of the IEEE 14 bus system, under various levels of renewable energy penetration as well as for different contingency cases. The results presented in the paper will help address challenges associated with maintaining power grid robustness in order to transition into environmentally-friendly power networks, with the ultimate objective of achieving 100% renewable grids.