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Appl. Sci. 2018, 8(1), 57; https://doi.org/10.3390/app8010057

Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System

1
Department of Electrical and Computer Engineering, Ajou University, 206, World cup-ro, Yeongtong-gu, Suwon 16499, Korea
2
Railroad Safety Research Division, Korea Railroad Research Institute, 176, Cheoldo Bangmulgwan-ro, Uiwang 16105, Korea
*
Author to whom correspondence should be addressed.
Received: 13 November 2017 / Revised: 27 December 2017 / Accepted: 28 December 2017 / Published: 2 January 2018
(This article belongs to the Special Issue Renewable Energy 2018)
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Abstract

This paper presents a low-voltage ride-through (LVRT) control strategy for grid-connected energy storage systems (ESSs). In the past, researchers have investigated the LVRT control strategies to apply them to wind power generation (WPG) and solar energy generation (SEG) systems. Regardless of the energy source, the main purpose of the LVRT control strategies is to inject reactive power into the grid depending on the grid-code regulations using the grid-side inverter; the proposed LVRT control strategy for grid-connected ESSs also has the same purpose. However, unlike the WPG and SEG systems having unidirectional power flow, grid-connected ESSs have a bidirectional power flow. Therefore, the charging condition of the grid-connected ESSs should be considered for the LVRT control strategy. The proposed LVRT control strategy for grid-connected ESSs determines the injection quantity of the active and reactive currents, and the strategy depends on the voltage drop ratio of the three-phase grid. Additionally, in this paper, we analyzed the variations of the point of common coupling (PCC) voltage depending on the phase of the reactive current during the charging and discharging conditions. The validity of the proposed LVRT control strategy is verified and the variations of the PCC voltage of the grid-connected ESS are analyzed by simulation and experimental results. View Full-Text
Keywords: low voltage ride through; wind power generation system; solar energy generation system; grid-connected; energy storage system low voltage ride through; wind power generation system; solar energy generation system; grid-connected; energy storage system
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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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Bak, Y.; Lee, J.-S.; Lee, K.-B. Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System. Appl. Sci. 2018, 8, 57.

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