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Energies 2017, 10(1), 91; doi:10.3390/en10010091

Equivalence of Primary Control Strategies for AC and DC Microgrids

Electronics and Computing Department, Mondragon Unibertsitatea, 20500 Mondragon, Spain
This paper is an extended version of our paper published in Proceedings of the 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC), Firenze, Italy, 7–10 June 2016.
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Author to whom correspondence should be addressed.
Academic Editor: Rodolfo Araneo
Received: 12 July 2016 / Revised: 1 December 2016 / Accepted: 4 January 2017 / Published: 12 January 2017
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Abstract

Microgrid frequency and voltage regulation is a challenging task, as classical generators with rotational inertia are usually replaced by converter-interfaced systems that inherently do not provide any inertial response. The aim of this paper is to analyse and compare autonomous primary control techniques for alternating current (AC) and direct current (DC) microgrids that improve this transient behaviour. In this context, a virtual synchronous machine (VSM) technique is investigated for AC microgrids, and its behaviour for different values of emulated inertia and droop slopes is tested. Regarding DC microgrids, a virtual-impedance-based algorithm inspired by the operation concept of VSMs is proposed. The results demonstrate that the proposed strategy can be configured to have an analogous behaviour to VSM techniques by varying the control parameters of the integrated virtual-impedances. This means that the steady-state and transient behaviour of converters employing these strategies can be configured independently. As shown in the simulations, this is an interesting feature that could be, for instance, employed for the integration of different dynamic generation or storage systems, such as batteries or supercapacitors. View Full-Text
Keywords: decentralized control; distributed generation (DG); inertia emulation; microgrids; power sharing; primary control; stability; virtual-impedance; virtual synchronous machine (VSM) decentralized control; distributed generation (DG); inertia emulation; microgrids; power sharing; primary control; stability; virtual-impedance; virtual synchronous machine (VSM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Unamuno, E.; Barrena, J.A. Equivalence of Primary Control Strategies for AC and DC Microgrids. Energies 2017, 10, 91.

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