Cost-Benefit Analysis of Distributed Energy Storage in Distribution Grids with Renewables

Currently Distributed Energy storage system (ESS) has a significant impact on the flexibility of medium/low voltage power distribution network to address the challenges due to growing power demand and increasing penetration of renewable energy resources. This work exploits and explicitly quantifies the potential benefit of optimal coordinated multiple ESSs to support the secure power supply of power distribution networks with distributed generations (DGs) by providing capacity services. The proposed model was compared against conventional methods and assessed in three case studies: different demand conditions, different sizing of ESSs and reactive power provisioning. The numerical result obtained from a set of simulation experiments clearly demonstrates various benefit of coordination of ESSs in supporting flexible and secure operation of power distribution networks, e.g. peak demand reduction, reactive power support.