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Open AccessFeature PaperArticle

Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

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Electrical, Electronic and Control Engineering Department, University of Extremadura, 06006 Badajoz, Spain
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Electronics and Computer Engineering Department, University of Cordoba, 14071 Cordoba, Spain
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Author to whom correspondence should be addressed.
Electronics 2020, 9(1), 140; https://doi.org/10.3390/electronics9010140
Received: 18 December 2019 / Revised: 6 January 2020 / Accepted: 7 January 2020 / Published: 11 January 2020
(This article belongs to the Special Issue Smart Energy Storage Systems)
It is usual in literature that power sharing among grid-forming sources of an isolated microgrid obeys their energy rating, instead of economic agreements between stakeholders, and circulating energy among them is usually avoided. However, these energy interchanges make strong sense and classical power sharing methods must be reformulated in the context of prosumer-based microgrids. This paper proposes a secondary control method for a prosumer-based low-voltage nanogrid that allows for energy interchange between prosumers, where storage systems, together with PV generators, are the controllable grid-forming sources. A power flow technique adapted to islanded microgrids is used for secondary control algorithm and the whole hierarchical control strategy for the prosumer converter is simulated and validated. This hierarchical control consists of three stages: tertiary control plans the energy interchange among prosumers, secondary obtains different voltage and power setpoints for each of the grid-forming sources, and, finally, primary control guarantees stable voltage and frequency values within the nanogrid with droop rules. Inner control loops for the power converter are also defined to track setpoints and assure stable performance. Simulation tests are carried out, which prove the stability of the proposed methods and the accuracy of the setpoint tracking. View Full-Text
Keywords: battery management system; power flow in microgrids; prosumer-based isolated nanogrid; secondary control; storage power converter control battery management system; power flow in microgrids; prosumer-based isolated nanogrid; secondary control; storage power converter control
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González-Romera, E.; Romero-Cadaval, E.; Roncero-Clemente, C.; Ruiz-Cortés, M.; Barrero-González, F.; Milanés Montero, M.-I.; Moreno-Muñoz, A. Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing. Electronics 2020, 9, 140.

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