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Energies 2016, 9(8), 596; doi:10.3390/en9080596

Comparative Analysis of Voltage Control in Battery Power Converters for Inverter-Based AC Microgrids

1
Research Institute, Korea Electric Power Corporation, Munji-ro 105, Yuseong-gu, Daejeon 34056, Korea
2
School of Electrical Engineering, Chungbuk National University, Chungbuk 361-763, Korea
3
Department of Electrical Engineering, Chosun University, Pilmun-daero 309, Dong-gu, Gwangju 61452, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Chunhua Liu
Received: 12 April 2016 / Revised: 11 July 2016 / Accepted: 25 July 2016 / Published: 28 July 2016
View Full-Text   |   Download PDF [12694 KB, uploaded 28 July 2016]   |  

Abstract

A microgrid is a micro-power system composed of local distributed generators, energy storage systems, loads, and other components in a local power network. Because renewable energy sources show relatively large output power variation, the integration of distributed generators in a microgrid often requires the installation of a large-scale energy storage system. The energy storage system is connected to a local AC bus via the DC/AC converter with an output inductor-capacitor (LC) filter. The energy storage system power converters generally form the local AC bus voltage. This grid-forming operation requires fast and robust voltage control to properly maintain a stable energy flow and high power quality in the local AC bus. In this paper, two major voltage control schemes—double-loop control and direct voltage control—are analytically compared, and their effects on the power quality of the microgrid are illustrated. The dynamic performance is compared through simulations and experimental results. View Full-Text
Keywords: distributed generators (DGs); microgrid; inverters; uninterruptable power supply (UPS); load sharing; battery distributed generators (DGs); microgrid; inverters; uninterruptable power supply (UPS); load sharing; battery
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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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MDPI and ACS Style

Chae, W.-K.; Won, J.-N.; Lee, H.-J.; Kim, J.-E.; Kim, J. Comparative Analysis of Voltage Control in Battery Power Converters for Inverter-Based AC Microgrids. Energies 2016, 9, 596.

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