Abstract
This paper discusses applications and benefits of distributed storage devices on the performance of distribution power systems. In particular, the paper focuses the uses of Battery Energy Storage System (BESS) for system improvement. An overview of predominant battery types are covered in this paper along with their benefits and advantages. Diverse applications for BESS are described such as peak load shaving, power quality improvement, load/frequency control, system balancing and congestion management. Impacts of plug-in electric vehicles are explained and problems regarding the dispatch of BESS units are also introduced.