Equivalence of Primary Control Strategies for AC and DC Microgrids

Eneko Unamuno and Jon Andoni Barrena
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Eneko Unamuno: Electronics and Computing Department, Mondragon Unibertsitatea, 20500 Mondragon, Spain
Jon Andoni Barrena: Electronics and Computing Department, Mondragon Unibertsitatea, 20500 Mondragon, Spain

Energies, 2017, vol. 10, issue 1, 1-13

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.

Keywords: decentralized control; distributed generation (DG); inertia emulation; microgrids; power sharing; primary control; stability; virtual-impedance; virtual synchronous machine (VSM) (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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