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Energies 2016, 9(8), 651; doi:10.3390/en9080651

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

1
Zhuhai Power Supply Bureau of Guangdong Power Grid Corporation, Zhuhai 519000, China
2
School of Information Science and Engineering, Central South University, Changsha 410083, China
3
Department of Energy Technology, Aalborg University, Aalborg East DK-9220, Denmark
*
Author to whom correspondence should be addressed.
Academic Editor: G.J.M. (Gerard) Smit
Received: 30 May 2016 / Revised: 9 August 2016 / Accepted: 10 August 2016 / Published: 17 August 2016
(This article belongs to the Special Issue Decentralized Management of Energy Streams in Smart Grids)
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Abstract

The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC- or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations. View Full-Text
Keywords: coordinated power control; droop control; hybrid microgrid; interlinking converters (ICs); static synchronous compensator (STATCOM) coordinated power control; droop control; hybrid microgrid; interlinking converters (ICs); static synchronous compensator (STATCOM)
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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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Liu, Y.; Hou, X.; Wang, X.; Lin, C.; Guerrero, J.M. A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode. Energies 2016, 9, 651.

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