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An independently controlled energy storage to support short term frequency fluctuations in weak electrical grids

Jayamaha, Prasanthi Charmalee; Costabeber, Alessando; Williams, Arthur; Sumner, M.

Authors

Prasanthi Charmalee Jayamaha charmalee.jayamaha@gmail.com

Alessando Costabeber alessandro.costabeber@nottingham.ac.uk

Arthur Williams eezaaw@exmail.nottingham.ac.uk

M. Sumner mark.sumner@nottingham.ac.uk



Abstract

This paper proposes the use of Energy Storage (ES) to support frequency fluctuations in weak grids powered by low-power synchronous generators (SGs). Traditionally, large synchronous generators rely on high inertia and governor control to guarantee the frequency stability of the network. The scenario changes in networks with a large penetration of small distributed generators (DGs) with smaller inertia, where load variations can lead to large frequency deviations, violating the over/under frequency protection limits. The proposed energy storage control injects active power during load transients so that the frequency is constrained within predefined thresholds. The system frequency is detected by a Double Second-Order Generalised Integrator Frequency Locked Loop (DSOGI-FLL), eliminating the need for communication between energy storage and synchronous generator and providing “plug-and-play” capability. The proposed method combined with the continuous speed governing supports the frequency well within the primary frequency transient requirements. The solution has been validated using an 8kW laboratory system.

Journal Article Type Article
Publication Date Dec 1, 2018
Journal International Journal of Electrical Power and Energy Systems
Print ISSN 0142-0615
Electronic ISSN 0142-0615
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 103
APA6 Citation Jayamaha, P. C., Costabeber, A., Williams, A., & Sumner, M. (2018). An independently controlled energy storage to support short term frequency fluctuations in weak electrical grids. International Journal of Electrical Power and Energy Systems, 103, doi:10.1016/j.ijepes.2018.05.023
DOI https://doi.org/10.1016/j.ijepes.2018.05.023
Keywords Energy storage systems; Primary frequency Control; Weak grids; DSOGIFLL; Distributed generation
Publisher URL https://www.sciencedirect.com/science/article/pii/S0142061516313102
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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