Decentralized Frequency Control of Battery Energy Storage Systems Distributed in Isolated Microgrid

Watcharakorn Pinthurat and Branislav Hredzak
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Watcharakorn Pinthurat: School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney 2052, Australia
Branislav Hredzak: School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney 2052, Australia

Energies, 2020, vol. 13, issue 11, 1-18

Abstract: The penetration and integration of renewable energy sources into modern power systems has been increasing over recent years. This can lead to frequency excursion and low inertia due to renewable energy sources’ intermittency and absence of rotational synchronous machines. Battery energy storage systems can play a crucial role in providing the frequency compensation because of their high ramp rate and fast response. In this paper, a decentralized frequency control system composed of three parts is proposed. The first part provides adaptive frequency droop control with its droop coefficient a function of the real-time state of charge of battery. The second part provides a fully decentralized frequency restoration. In the third part, a virtual inertia emulation improves the microgrid resilience. The presented results demonstrate that the proposed control system improves the microgrid resilience and mitigates the frequency deviation when compared with conventional ω - P droop control and existing control systems. The proposed control system is verified on Real-Time Digital Simulator (RTDS), with accurate microgrid model, nonlinear battery models and detailed switching models of power electronic converters.

Keywords: battery energy storage system; adaptive frequency droop control; virtual inertia; frequency restoration; state of charge (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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