Auxiliary redundant power supply for an energy storage system and energy storage system

Abstract

An auxiliary power supply for an energy storage rack of a high-voltage DC system. The power supply has at least one AC power supply branch with input terminals, transfer terminals and a low voltage transformer. The low voltage transformer has an input branch configured for receiving AC electrical power from the input terminals, a transfer branch configured for transferring the AC electrical power to the transfer terminals, and s a supply branch configured for transforming the received AC electrical power to a lower voltage in extra low voltage range for supplying a control unit. The power supply also has at least one DC power supply branch that includes an LV DC power source configured for supplying DC electrical power to the control unit. Also an energy storage rack and a energy storage system.

Dependencies are inferred from the claim text.