Shireen, Wajiha2019-09-10December 22018-12December 2https://hdl.handle.net/10657/4429Electricity generation in conventional power systems is mostly obtained through the use of synchronous machines, which determine system frequency due to their electromechanical coupling. These machines relieve fluctuations in the generation-load balance through the absorption and release of kinetic energy, and large frequency excursions are prevented by the inertia of the rotating masses. Renewable technologies such as Wind Turbine Generators and Photovoltaic Panels require the use of power electronics to interface with the grid and do not provide inertia. Thus, system overall rotational inertia is decreased as the share of inverter-based renewable technologies increases. This thesis 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 thesis proposes a methodology for the application of Energy Storage Systems that will allow power grid to maintain robustness against frequency deviations. This is a significant challenge to resolve in order to transition into environmentally-friendly power networks, with the ultimate objective of achieving 100% renewable grids.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).FrequencyBESSRate of change of frequency (RoCoF)Power systemsDynamicsRenewable2019-09-10Thesisborn digital