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Energies 2019, 12(6), 972; https://doi.org/10.3390/en12060972

Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support

1
School of Industrial Engineering, University of Extremadura, 06006 Badajoz, Spain
2
INESC-ID and Setúbal School of Technology, Polytechnic Institute of Setúbal, 2910-761 Setúbal, Portugal
3
INESC Coimbra and Setúbal School of Technology, Polytechnic Institute of Setúbal, 2910-761 Setúbal, Portugal
4
Faculty of Sciences and Technology, Nova University of Lisbon, 2829-516 Caparica, Portugal
*
Author to whom correspondence should be addressed.
Received: 22 February 2019 / Revised: 6 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Power Electronic Systems for Efficient and Sustainable Energy Supply)
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Abstract

The proliferation of residential photovoltaic (PV) prosumers leads to detrimental impacts on the low-voltage (LV) distribution network operation such as reverse power flow, voltage fluctuations and voltage imbalances. This is due to the fact that the strategies for the PV inverters are usually designed to obtain the maximum energy from the panels. The most recent approach to these issues involves new inverter-based solutions. This paper proposes a novel comprehensive control strategy for the power electronic converters associated with PV installations to improve the operational performance of a four-wire LV distribution network. The objectives are to try to balance the currents demanded by consumers and to compensate the reactive power demanded by them at the expense of the remaining converters’ capacity. The strategy is implemented in each consumer installation, constituting a decentralized or distributed control and allowing its practical implementation based on local measurements. The algorithms were tested, in a yearly simulation horizon, on a typical Portuguese LV network to verify the impact of the high integration of the renewable energy sources in the network and the effectiveness and applicability of the proposed approach. View Full-Text
Keywords: photovoltaic (PV) systems; ancillary services; low-voltage (LV) network; voltage imbalance; reactive power control; smart grids; power electronic converters photovoltaic (PV) systems; ancillary services; low-voltage (LV) network; voltage imbalance; reactive power control; smart grids; power electronic converters
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Barrero-González, F.; Pires, V.F.; Sousa, J.L.; Martins, J.F.; Milanés-Montero, M.I.; González-Romera, E.; Romero-Cadaval, E. Photovoltaic Power Converter Management in Unbalanced Low Voltage Networks with Ancillary Services Support. Energies 2019, 12, 972.

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