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

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

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.

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, https://doi.org/10.1016/j.ijepes.2018.05.023

• Journal Article Type: Article
• Acceptance Date: May 16, 2018
• Online Publication Date: Jun 19, 2018
• Publication Date: Dec 1, 2018
• Deposit Date: May 29, 2018
• Publicly Available Date: Jun 20, 2019
• 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
• DOI: https://doi.org/10.1016/j.ijepes.2018.05.023
• Keywords: Energy storage systems; Primary frequency Control; Weak grids; DSOGIFLL; Distributed generation
• Public URL: https://nottingham-repository.worktribe.com/output/950970
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0142061516313102
• Contract Date: May 29, 2018