In a standalone microgrid system, prolonging the life of the equipment is necessary to reduce the cost of its replacement. However, the size and installation costs of the storage systems must be appropriate. Therefore, this paper provides an appropriate weighting to minimize the cost of the microgrid system.
A microgrid is a small power system constructed to manage Distributed Generators (DGs) from renewable energy and load clusters. The microgrid that connects to the bulk power system is called to be in “on-grid mode”, and when it disconnects from the bulk power system in an emergency, it is called to be in “islanded mode”.
Isolated microgrids can be of any size depending on the power loads. In this sense, MGs are made up of an interconnected group of distributed energy resources (DER), including grouping battery energy storage systems (BESS) and loads.
Because of renewable energy generation sources such as PV and Wind Turbine (WT), the output power of a microgrid varies greatly, which can reduce the BESS lifetime. Because the BESS has a limited lifespan and is the most expensive component in a microgrid, frequent replacement significantly increases a project’s operating costs.
MGs are a set of decentralized and intelligent energy distribution networks, which possess specific characteristics critical to the evolution of energy systems . There exist several definitions of microgrid in the scientific literature , , , .
Because the BESS has a limited lifespan and is the most expensive component in a microgrid, frequent replacement significantly increases a project’s operating costs. This paper proposes a capacity optimization method as well as a cost analysis that takes the BESS lifetime into account.