Control strategy of energy storage system for frequency support of autonomous microgrid

In this paper, an autonomous medium-voltage (MV) microgrid placed in Dongao Island is presented, which integrates renewable-energy-based distributed generations (DGs), energy storage systems (ESS), and local loads. In an autonomous microgrid without connection to the main grid to support the frequency, it is more complex to control and manage. Therefore, in order to maintain the frequency stability during autonomous mode, control strategy of ESS for microgrid frequency support is proposed. Finally, in order to validate the effectiveness of the introduced control strategy, time-domain simulation results under various actual conditions and scenarios in the Dongao Island microgrid are presented.