An Enhancing Fault Current Limitation Hybrid Droop/V-f Control for Grid-Tied Four-Wire Inverters in AC Microgrids

Microgrid integration and fault protection in complex network scenarios is a coming challenge to be faced with new strategies and solutions. In this context of increasing complexity, this paper describes two specific overload control strategies for four-wire inverters integrated in low voltage four-...

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Bibliographic Details
Published in:Applied sciences 2018-09, Vol.8 (10), p.1725
Main Authors: Heredero-Peris, Daniel, Chillón-Antón, Cristian, Pagès-Giménez, Marc, Montesinos-Miracle, Daniel, Santamaría, Mikel, Rivas, David, Aguado, Mónica
Format: Article
Language:English
Subjects:
Alternating current
Batteries
Control strategies
Distribució d’energia elèctrica
Distributed generation
Electric networks
Electric power grids
Electrical engineering
Energia elèctrica
Energies
Energy
Enginyeria elèctrica
Fault current limitation
International conferences
Inverters
Load
Low voltage
Microgrids
Phasors
Proposals
Short circuits
Three-phase four-wire systems
Time response
Voltage
Wire
Xarxes elèctriques
Àrees temàtiques de la UPC
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Summary:Microgrid integration and fault protection in complex network scenarios is a coming challenge to be faced with new strategies and solutions. In this context of increasing complexity, this paper describes two specific overload control strategies for four-wire inverters integrated in low voltage four-wire alternating current (AC) microgrids. The control of grid-tied microgrid inverters has been widely studied in the past and mainly focused on the use of droop control, which hugely constrains the time response during grid-disconnected operation. Taking into account the previous knowledge and experience about this subject, the main contribution of these two proposals regards providing fault current limitation in both operation modes, over-load capability skills in grid-connected operation and sinusoidal short-circuit proof in grid-disconnected operation. In the complex operation scenarios mentioned above, a hybrid combination of AC droop control based on dynamic phasors with varying virtual resistance, and voltage/frequency master voltage control for grid-(dis)connected operation modes are adopted as the mechanism to enhance time response. The two proposals described in the present document are validated by means of simulations using Matlab/Simulink and real experimental results obtained from CENER (The National Renewable Energy Centre) experimental ATENEA four-wire AC microgrid, obtaining time responses in the order of two-three grid cycles for all cases.
ISSN:2076-3417
2076-3417
DOI:10.3390/app8101725