Plant controls for self-supply applications of energy storage systems

Abstract

An energy storage system having a self-supply mode includes a plurality of battery energy storage system (BESS) modules, a plant controller, and an auxiliary system. The plant controller operates the energy storge system in a self-supply mode to supply electric power to the auxiliary system when the energy storage system is disconnected from an electric grid. The self-supply mode includes monitoring, for each of the rechargeable BESS enclosures, a state of charge parameter (SoC), sequentially activating one of the rechargeable BESS enclosures to supply electric power to the auxiliary system, and upon determining that the SoC of the one of the rechargeable BESS enclosures is less than a threshold, deactivating the one rechargeable BESS enclosure and activating another of the plurality of rechargeable BESS enclosures to supply electric power to the auxiliary system.

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