DOI:10.1007/s40565-015-0177-0 |
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Fault ride-through of renewable energy conversion systems during voltage recovery |
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Page view: 45
Net amount: 1615 |
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Author:
Ruiqi LI1, Hua GENG1, Geng YANG1
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Author Affiliation:
1. Department of Automation, Tsinghua University, Beijing, 100084, China
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Foundation: |
National Natural Science Foundation of China (NSFC) under Grant 61273045 and 51361135705, National High Technology Research and Development Program of China under Grant 2012AA050217, and grants from Beijing Higher Education Young Elite Teacher Project. |
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Abstract: |
Asymmetrical voltage swells during recovery of a short-circuit fault lead to fluctuations in the dc-link voltage of a renewable energy conversion system (RECS), and may induce reversed power flow and even trip the RECS. This paper studies characteristics of both typical causes resulting in the practical asymmetrical voltage swell and the voltage at the point of common coupling (PCC) during the fault recovery. As analyzed, the fault recovery process can be divided into two continuous periods in which different control strategies have to be applied. Also protective measures are necessary in the transient period of the process. Additionally, the asymmetrical high-voltage ride-through capability and the controllability criteria of the RECS are analyzed based on eliminating the fluctuations. Furthermore, an asymmetrical control scheme is proposed to maintain the controllability of the RECS and ride through the entire recovery process. As verified by the simulation, the scheme can promise the RECS to deal with the practical fault recovery period and mitigate the dc-link voltage fluctuations, which improves the reliability of the RECS and the power system. |
Keywords: |
Inverter, Renewable energy conversion system, Asymmetrical grid voltage, High-voltage ride-through (HVRT), Limit analysis |
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Online Time:2016/01/22 |
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