Abstract
This paper research the issues of economic comparison of electrical energy storage systems based on the levelised cost of storage (LCOS). One of the proposed formulas for LCOS calculation was given, the parameters to be considered and the basic principles of their calculation were examined in detail. The LCOS was calculated for an electrical energy storage system, whose main function is to compensate for rapid changes in load power. LCOS sensitivity to changes in variables was analysed. The scope of potential application of the formula under consideration was specified, and the limitations preventing its wider use were indicated.
Highlights
The growing global interest in small-scale and distributed generation, as well as the use of renewable energy sources, results in a high demand for electrical energy storage systems (ESS), which use various storage devices: electrochemical storages, supercapacitors, gravity batteries etc
According to the calculation results obtained based on the above calculation procedure, the levelised cost of storage for the examined case of using an ESS in a self-contained power system is 0.53 $/kWh
The formula (1) used to calculate the Levelised Cost of Storage (LCOS) is a convenient indicator for comparing different electrical energy storage systems with similar functions and technical parameters
Summary
The growing global interest in small-scale and distributed generation, as well as the use of renewable energy sources, results in a high demand for electrical energy storage systems (ESS), which use various storage devices: electrochemical storages (which are primarily addressed in this paper), supercapacitors, gravity batteries etc. As of today, there is no generally accepted economic indicator which would allow us to compare different energy storage systems, unlike in the planning of construction of power plants, for example, where the indicator “Levelised Cost of Electricity (LCOE)” has been accepted. Modification of the formula for LCOE calculation [1, 2], having adapted it for electrical energy storage systems, was proposed. The indicator derived in this way was called “Levelised Cost of Storage (LCOS)”. Despite the fact that currently there is no LCOS calculation procedure approved by international and national standards, this indicator is actively used by manufacturers, analytical agencies [3], government bodies [4], and other persons working in the field of energy storage
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