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A Centralized Shifted Voltage Control Method for Accurate Power Sharing in DC Islanded Microgrids

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Abstract
Due to line impedance mismatch among renewable energy sources (RESs), it is hard to realize accurate power sharing in the DC microgrid system. To solve this issue, a distributed power sharing strategy for adjusting the RES output voltage is developed by adding shifted output voltage into each local controller. Thanks to the shifted voltage, the influence of voltage drop caused by the droop controller is effectively mitigated, so that the DC bus voltage is constantly balanced regardless of the load changes. The proposed method is realized with a centralized approach, and all the required control variable to determine the reference voltage is transmitted through low-bandwidth communication. The controller design and system stability are analyzed in detail with a simplified microgrid model. Small-scale DC microgrid is simulated to verify the effectiveness of the centralized shifted voltage control method.
Author(s)
이홍희팜 민 득
Issued Date
2021
Type
Article
Keyword
DC microgridCentralized control approachProportional power sharing
DOI
10.24084/repqj19.242
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9024
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_24084_repqj19_242&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,A%20Centralized%20Shifted%20Voltage%20Control%20Method%20for%20Accurate%20Power%20%20Sharing%20in%20DC%20Islanded%20Microgrids&offset=0&pcAvailability=true
Publisher
Renewable Energy and Power Quality Journal
Location
스페인
Language
영어
Citation Volume
19
Citation Number
1
Citation Start Page
155
Citation End Page
159
Appears in Collections:
Engineering > Electrical engineering
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