A distributed control for accurate active‐power sharing in islanded microgrids subject to clock drifts

Inverters‐based islanded microgrids are operated by local digital signal processors, driven by their own local clocks. These local clocks have drifts affecting the clock signals which are used to control the inverters in real time. In this scenario, a steady‐state deviation is observed in active pow...

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Bibliographic Details
Published inIET power electronics Vol. 14; no. 3; pp. 518 - 530
Main Authors Alfaro, Carlos, Castilla, Miguel, Camacho, Antonio, Marti, Pau, Velasco, Manel
Format Journal Article
LanguageEnglish
Published Wiley 01.02.2021
Subjects
Control of electric power systems
Digital signal processing
Distribution networks
Multivariable control systems
Signal processing and detection
Stability in control theory
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Summary:Inverters‐based islanded microgrids are operated by local digital signal processors, driven by their own local clocks. These local clocks have drifts affecting the clock signals which are used to control the inverters in real time. In this scenario, a steady‐state deviation is observed in active power sharing, degrading the microgrid performance. This paper presents a new control scheme that improves the microgrid performance by cancelling the active power sharing error due to clock drifts. The study includes a theoretical stability analysis and a design procedure of the control parameters based on the dynamic characteristics. Finally, selected experimental results are obtained in a laboratory microgrid with four inverters. In this setup, each inverter was equipped with its digital signal processor with drifting local clock.
ISSN:1755-4535
1755-4543
DOI:10.1049/pel2.12010