Deploying battery energy storage system to enhance the primary frequency response and under frequency load shedding schemes in islanded microgrids

Islanded microgrids are considered a feasible power supply option especially for servicing communities that are located far or across difficult terrain for connection to the main interconnected power system. These microgrids are typically supplied with power from alternative generation sources such as solar photovoltaic (PV) with backup supply from battery energy storage systems (BESS). Two low power (< 100 kW) islanded microgrid systems that supplies electricity to villages in South Africa is considered. The one microgrid serves residential loads and the other microgrid serves a commercial load. The aim of the study is to assess the frequency response and the under-frequency loading shedding due to the loss of solar