Power storage system

A power storage system comprising:

• a three-phase alternating current (AC) wire connected to a three-phase AC power system;
• a plurality of power storage blocks connected in parallel to the three-phase AC wire, each of the power storage blocks including a power storage module and a power conditioner;
• and
• a system controller that individually controls the plurality of power storage blocks,
• the power storage modules each including
• a power storage unit, and
• a management unit that manages the power storage unit,
• the power conditioner including
• a power converter that converts direct current (DC) power discharged from the power storage unit into single-phase AC power and outputs the converted AC power to two lines of the three-phase AC wire or that converts single-phase AC power received from the two lines of the three-phase AC wire into DC power and charges the power storage unit, and
• a controller that controls the power converter, the controller being connected to the system controller via a first communication line, the controller being connected to the management unit via a second communication line,
• the plurality of power storage blocks being six or more power storage blocks,
• out of the six or more power storage blocks connected in parallel to the three-phase AC wire, two or more power storage blocks being U-phase power storage blocks, two or more power storage blocks being V-phase power storage blocks, and two or more power storage blocks being W-phase power storage blocks.