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Matching intermittency and electricity storage characteristics through time scale analysis. An energy return on investment comparison

Abstract

A high penetration of variable renewable energy sources in an electricity generation mix leads to strong constraints on the whole system to ensure a continuous balance between electricity production and consumption. We have developed a new numerical methodology to quantify the relevance of several electricity storage devices that would provide the required flexibility. First of all, through a signal analysis (wavelet decomposition) of photovoltaic power (PV), wind power and load time series, we study and characterize the intermittency at different time scales. Then, each storage technology is evaluated for each time scale from an Energy Return On Investment (EROI) standpoint. The relevance of a given technology especially depends on its efficiency and embodied energy. For instance, we show that batteries are not appropriate for a long term storage because of their high embodied energy, but they are accurate at short term with high number of cycles, because of their high efficiency. We characterize the relevance of storage devices, their sensitivity to the production mix and to technological characteristics. We point out that satisfying the last percents of the load with only storage devices requires over-sizing of the system. It underlines the complementarity with dispatchable power plants. We eventually show that seasonal electricity storage is particularly difficult to ensure with a good Energy Return On Investment.

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Publication details

The article was received on 03 Jul 2018, accepted on 17 Oct 2018 and first published on 17 Oct 2018


Article type: Paper
DOI: 10.1039/C8EE01940A
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
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    Matching intermittency and electricity storage characteristics through time scale analysis. An energy return on investment comparison

    A. Clerjon and F. Perdu, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE01940A

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