Design and Operation of an Islanded Power System with 100% Renewable Energy Supply

Abstract

The design concepts for the 1 MW microgrid power system installed at Ameren Illinois's Technology Applications Center are presented. Specifically, the design and operation of the system when the renewable generation capacity is more than 100% of the connected load is discussed. The methods include utilizing a grid-forming battery energy storage inverter to balance load and generation, and utilizing a microgrid controller for detecting a maximum desired state of charge on the battery system and issuing generation curtailment commands to renewable generation assets.