M.Sc Thesis


M.Sc StudentBen Yosef Gefen
SubjectFrequency Stability of the Israeli Power Grid With High
Penetration of Renewable Sources and Energy
Storage Systems
DepartmentDepartment of Electrical and Computer Engineering
Supervisor ASSOCIATE PROF. Yoash Levron
Full Thesis textFull thesis text - English Version


Abstract

Israel follows the global trend to replace electrical energy generation from sources of fossil fuels to sources of renewable energy. Unlike most countries, Israel relies mostly on solar photovoltaic technology in order to achieve high levels of renewable energy generation, and its electrical grid is isolated and small. As a result, already in 2020 the Israeli power system faced frequency stability challenges it never experienced before. These challenges are expected to further increase as more renewable energy is integrated to the system. In order to prepare for these challenges Israel started recently to integrate energy storage to the system. In this light, this work examines the impact of renewable sources and energy storage systems on the frequency stability of the Israeli grid. We use here for the first time the most realistic dynamic model of the Israeli grid, which includes detailed information on the transmission network, generation units, and loads. Based on this model, we examine different locations and sizes of renewable sources and storage systems, focusing on the frequency dynamics. The results lead to several policy recommendations. One main conclusion is that the Israeli power system already has the required resources to maintain frequency stability in case a large generation unit is lost. However, to maintain a reliable system, policy makers should encourage that additional storage will contribute to frequency regulation when there is a risk of instability. We also find that the location of renewable energy sources and energy storage systems has an impact on the frequency stability, and that it is better to place storage systems in the south, and renewable energy sources in the north. However, this impact is not yet strong enough to be a leading factor in determining the location of these sources in the next five years.