NDLI: Droop-free hierarchical control strategy for inverter-based AC microgrids

Content Provider	IET Digital Library
Author	Rey, Juan M. Vergara, Pedro P. Castilla, Miguel Camacho, Antonio Velasco, Manel Martí, Pau
Abstract	Hierarchical schemes are widely used for the designing of the inverter-based AC microgrids control strategies. To ensure reliable operation, hierarchical control must consider together all the functionalities that allow the regulation of key variables and guarantee a safe transition between operation modes. Conventionally, in the literature are proposed three-layer schemes which present relevant drawbacks: they include limited functionalities and they use droop method for the primary layer which, despite its decentralised nature, suffers from issues that have motivated the development of alternative strategies. Considering this, the contribution of this study is two-fold. First, a droop-free hierarchical control strategy that satisfies a proper operation of AC microgrids is proposed. Control objectives such as power-sharing, frequency regulation, optimal power dispatch and voltage regulation are considered. Second, a closed-loop small-signal model, which facilitates the control parameters design and fills a gap in the literature is presented. Differences between the proposal and previous controls are discussed. Selected tests are carried out in a laboratory microgrid under different conditions, including normal operation and the response to failures in the central controller and to communication impairments. The experimental results show a good performance of the proposal even in adverse conditions.
Starting Page	1403
Ending Page	1415
Page Count	13
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 7, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0705
Journal	IET Power Electronics
Publisher Date	2020-01-28
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Alternative Strategy Central Controller Control Objectives Control of Electric Power System Control Parameter Design Distributed Power Generation Droop-free Hierarchical Control Strategy Energy Management System Frequency Control Hierarchical Scheme Inverter-based AC Microgrid Control Strategy Invertors Operation Mode Optimal Power Dispatch Power Generation Control Power Grid Previous Control Three-layer Scheme Voltage Control Voltage Regulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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