Impact of Clock Drifts on Communication-Free Secondary Control Schemes for Inverter-Based Islanded Microgrids

In inverter-based microgrids, individual inverters operate usually with their own digital processor. The clocks used to generate the time signals of these processors differ from each other due to clock drifts. This paper analyzes the impact that the drifts of the processors clocks produce on the ope...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-06, Vol.65 (6), p.4739-4749
Main Authors: Castilla, Miguel, Camacho, Antonio, Marti, Pau, Velasco, Manel, Ghahderijani, Mohammad Moradi
Format: Article
Language:English
Subjects:
Clock synchronization
Clocks
Communication
Communication networks
communication-free control
Control charts
Data processing
distributed control
Distributed generation
Drift
Electric power distribution
Electric power grids
Enginyeria electrònica
Frequency control
Impact analysis
Inverters
islanded microgrids
Low pass filters
Microelectrònica
Microgrids
Microgrids (Smart power grids)
Microprocessors
Process control
Processadors digitals
Processors
Production planning
Signal processing
Steady-state
Synchronization
Time signals
Xarxes elèctriques
Àrees temàtiques de la UPC
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Summary:In inverter-based microgrids, individual inverters operate usually with their own digital processor. The clocks used to generate the time signals of these processors differ from each other due to clock drifts. This paper analyzes the impact that the drifts of the processors clocks produce on the operation of inverter-based islanded microgrids. Several communication-free secondary control schemes, which avoid well-known problems caused by digital communication networks, are considered. Active power sharing and frequency regulation are the metrics used to evaluate the performance of the control schemes. The study reveals advantages, drawbacks, and practical limitations of the control schemes caused by the clocks drifts. Therefore, it facilitates the selection of the most suitable control scheme for the practical deployment of microgrids. The theoretical results are validated by experimental tests in a laboratory microgrid equipped with three inverters and three digital signal processors driven by autonomous internal clocks.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2772178