Harmonics Measurements and Analysis of Battery Energy Storage Systems in Microgrids

Battery energy storage systems (BESSs) have become an important measure for increasing renewable energy penetration and maintaining system supply reliability in many countries worldwide. Regardless of what type of BESSs, the battery should be charged or discharged through power converters. When a large number of BESSs is connected to distribution systems, there will be a degree of influence on the power quality. This paper presents harmonics measurement and analysis for smart energy storage systems for a practical microgrid in rural areas in Taiwan. Study results can provide utilities useful information for grid planning and operation against significant renewable energy penetration with BESSs.