Considerations on the need for electricity storage requirements: Power versus energy

Abstract Different storage technologies enable an increasing share of variable renewable generation in the electricity system by reducing the temporal mismatch between generation and demand. Two storage ratings are essential to time-shift delivery of electricity to loads: electric power, or instantaneous electricity flow [W], and electric energy, or power integrated over time [Wh]. An optimal storage portfolio is likely composed of multiple technologies, each having specific power and energy ratings. This paper derives and explains the link between the shape of the time-varying demand and generation profiles and the amount of desirably installed storage capacity, both energy and power. An analysis is performed for individual storage technologies first, showing a link between the necessary power and energy capacity and the demand and generation profile. Then combinations of storage technologies are analyzed to reveal their mutual interaction in a storage portfolio. Results show an increase in desirability for storage technologies with low cost power ratings when the mismatch between generation and demand occurs in daily to weekly cycles. Storage technologies with low cost energy ratings are preferred when this mismatch occurs in monthly to seasonal cycles. The findings of this work can help energy system planners and policy makers to explain results from generation expansion planning studies and to isolate the storage benefits accountable to temporal arbitrage in broader electricity storage studies.

[1]  Geert Deconinck,et al.  Operational flexibility provided by storage in generation expansion planning with high shares of renewables , 2015, 2015 12th International Conference on the European Energy Market (EEM).

[2]  J.P. Barton,et al.  Energy storage and its use with intermittent renewable energy , 2004, IEEE Transactions on Energy Conversion.

[3]  Florian Steinke,et al.  Grid vs. storage in a 100% renewable Europe , 2013 .

[4]  Adrian Ilinca,et al.  Energy storage systems—Characteristics and comparisons , 2008 .

[5]  Jennifer Morris,et al.  Renewables Intermittency: Operational Limits and Implications for Long-Term Energy System Models , 2015 .

[6]  Peter Meibom,et al.  Wind power impacts and electricity storage – A time scale perspective , 2012 .

[7]  R. Davy,et al.  Cross-Spectrum of Wind Speed for Meso-Gamma Scales in the Upper Surface Layer over South-Eastern Australia , 2011 .

[8]  Paul Denholm,et al.  Grid flexibility and storage required to achieve very high penetration of variable renewable electricity , 2011 .

[9]  Sonia Martínez,et al.  Exact sizing of battery capacity for photovoltaic systems , 2014, Eur. J. Control.

[10]  John K. Kaldellis,et al.  Integrated electrification solution for autonomous electrical networks on the basis of RES and energy storage configurations , 2008 .

[11]  F. Geth Battery Energy Storage Systems and Distribution Grid Support , 2014 .

[12]  P. Welch The use of fast Fourier transform for the estimation of power spectra: A method based on time averaging over short, modified periodograms , 1967 .

[13]  Azah Mohamed,et al.  A review on sizing methodologies of photovoltaic array and storage battery in a standalone photovoltaic system , 2016 .

[14]  William D'haeseleer,et al.  Possible role of power-to-gas in future energy systems , 2015, 2015 12th International Conference on the European Energy Market (EEM).

[15]  Claus Krog Ekman,et al.  Prospects for large scale electricity storage in Denmark , 2010 .

[16]  Aie,et al.  Energy Technology Perspectives 2012 , 2006 .

[17]  J. K. Kaldellis,et al.  Autonomous dual-mode CAES systems for maximum wind energy contribution in remote island networks , 2010 .

[18]  M. Thring World Energy Outlook , 1977 .

[19]  Guangyu Tu,et al.  Optimal sizing and control strategy of isolated grid with wind power and energy storage system , 2014 .

[20]  J. Vandewalle Natural Gas in the Energy Transition - Technical Challenges and Opportunities of Natural Gas and its Infrastructure as a Flexibility-providing Resource , 2014 .

[21]  Pengwei Du,et al.  Sizing Energy Storage to Accommodate High Penetration of Variable Energy Resources , 2012, IEEE Transactions on Sustainable Energy.