Energy storage system and zero sequence voltage interphase SOC balance control device and method thereof

The invention belongs to the technical field of energy storage systems, and particularly relates to an energy storage system and a zero sequence voltage interphase SOC balance control device and method thereof. The energy storage system is a high-voltage energy storage system, and the maximum deviation term is determined by comparing the three-phase SOC deviation values of the energy storage system; when the absolute value of the deviation value of the maximum deviation item is smaller than or equal to a set dead zone value, the control quantity of the zero-sequence voltage is set to be 0, and when the absolute value of the deviation value of the maximum deviation item is larger than the set dead zone value, the phase of the corresponding zero-sequence voltage is set according to different conditions of three-phase SOC deviation, and then the control quantity of the zero-sequence voltage is obtained according to the phase and a set voltage amplitude; and adding the zero sequence voltage control quantity and t