Impact of energy storage devices on reliability of distribution system

Modern society expects the power supply to be continuously available on demand because of its pattern of social and working habits. Hence, reliability is a key factor in power system designing and planning. Reliability of power system can be monitored at various levels of generation, transmission and distribution. This paper examines the impact of large scale energy storage on distribution system reliability. Both distributed and lumped placement of energy storage devices have been considered to calculate its impact on feeder as well as overall system reliability. DIgSILENT Power Factory 14.1 has been used as simulation tool. Results show that with introduction of energy storage devices into distribution system, duration of outage decreases in an annum. However, the inclusion of storage devices increases the frequency of outage to some extents.