ENERGY STORAGE SYSTEMS, ENERGY STORAGE SYSTEM CONTROL METHODS, AND ENERGY STORAGE MODULES

Abstract

The invention relates to the field of power supply technology and reveals an energy storage system, a method for controlling an energy storage system, and an energy storage module. The energy storage system comprises a battery pack, a power converter circuit, and a controller. The output of the battery pack is connected to the first terminal of the power converter circuit, and the second terminal of the power converter circuit is connected to the output of the energy storage system. The power converter circuit converts the direct current supplied by the battery pack into alternating current and then transmits the alternating current into the alternating current grid, or converts the alternating current obtained from the second terminal of the power converter circuit into direct current to charge the battery pack. Each battery pack comprises at least two energy storage modules connected in series, each energy storage module comprises a branch circuit and a battery pack, and each battery pack comprises multiple batteries.The controller will regulate the branch circuit based on the first parameter value of each battery pack, so that the electrical charges of the battery packs are balanced. Based on the energy storage system, the electrical charges of the battery packs can be balanced, thereby reducing the impact on the current of the battery cluster and reducing energy waste.