Ameren Corporation and S&C Electric Company announced that they had successfully conducted a 24-hour islanding test at the recently deployed Ameren microgrid in Champaign, Illinois. The test focused specifically on the 50-kW microgrid at the site, which powers an Ameren research facility. The complete microgrid includes 225 kW of renewable generation (PV solar and wind) and 250 kW / 500 kWh of battery energy storage.
The test began at 8 a.m. on Aug. 3, 2017, with the battery’s state of charge at 97 percent capacity. Once the battery was depleted to 90 percent capacity, solar and wind generation kicked in, simultaneously carrying the load and charging the battery. This pattern continued throughout the day, never letting the battery fall lower than 88 percent capacity. The microgrid functioned without any human interaction, automatically coordinating resources and ensuring power never faltered, according to the company.
“We have one of the few microgrids in the world that operates at utility-scale voltages and can seamlessly transition from grid-connected to islanded mode.” [rew]