A BATTERY ENERGY STORAGE, BATTERY ENERGY STORAGE SYSTEM, METHOD, COMPUTER PROGRAM AND COMPUTER PROGRAM PRODUCT

摘要

The present disclosure provides a battery energy storage 5 arranged to be connected to a capacitor link 4, which is connected in parallel to a power converter 2. The battery energy storage comprises a battery module 8 and a direct current energy source 7 connected in series with a voltage source converter 6. The voltage source converter 6 is adapted to insert a positive voltage when the voltage of the battery module 8 falls below a first threshold value, and to insert a negative voltage when the voltage of the battery module 8 exceeds a second threshold value. The direct current energy source 7 is adapted to be either charged or discharged during the voltage insertion by the voltage source converter 6. The disclosure also provides a battery energy storage system 1 comprising such battery energy storage 5.