Electric power dispatching system and electric power dispatching method

An electric power dispatching system is cooperated with a power dispatching station, which centrally stores a plurality of swappable battery packs unloaded from different electric vehicles by an exchanging device, and each of the swappable battery packs has a DC power converter and a plurality of battery cells, which are electrically connected to each other, and part of the swappable battery packs have the same appearance and different capacity, comprising:

• a plurality of accommodating spaces, which respectively accommodate the corresponding swappable battery pack, and each accommodating space being provided with a connector, which being contacted to the corresponding swappable battery pack and at least some of the connectors being coupled in parallel to a DC bus;
• an AC/DC power conversion device, which being coupled between the DC bus and a power grid;
• and
• an energy control center, which controls the AC/DC power conversion device and the DC power converter of each swappable battery pack accommodated in each accommodating space, and designates a part of the swappable battery pack accommodated in the accommodating space to participate in a first power dispatch task,
• wherein the first power dispatch task includes providing power to the power grid by the designated swappable battery packs through the DC bus and the AC/DC power conversion device.