Energy storage system and self-start method thereof

A method of self-starting an energy storage system, comprising:

• closing a first miniature circuit breaker of a target single rack, so that a DC/DC power module of the target single rack is energized and outputs power to a master battery management unit, a host computer, and a slave battery management unit of the target single rack, wherein the target single rack is a single rack, meeting a preset condition, of the energy storage system;
• controlling, by the slave battery management unit of the target single rack, a wake-up relay of the target single rack to be closed, so that a CSC module of the target single rack starts to work after being awakened, thereby completing start-up of the target single rack;
• controlling, through the host computer, the target single rack to be powered on at high voltage, a DC bus to be energized, and a power conversion system to be energized;
• receiving, by a DC/DC power module of a kth single rack, power from the DC bus, and outputting the power to a slave battery management unit of the kth single rack, wherein k is a natural number between 1 and n, and the kth single rack is any single rack of the energy storage system except for the target single rack;
• and
• controlling, by the slave battery management unit of the kth single rack, a wake-up relay of the kth single rack to be closed, so that a CSC module of the kth single rack starts to work after being awakened, thereby completing start-up of the kth single rack.