DOI:https://doi.org/10.1007/s40565-018-0388-2 |
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Improved virtual synchronous control for grid-connected VSCs under grid voltage unbalanced conditions |
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Net amount: 1149 |
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Author:
Lei SHANG1 , Jiabing HU1, Xiaoming YUAN1, Yunhui HUANG2
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Author Affiliation:
1. Huazhong University of Science and Technology, No. 1037.
Luoyu Rd, Wuhan 430074, China
2. Wuhan University of Technology, No. 122. Luoshi Rd,
Wuhan 430074, China
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Foundation: |
This work was supported by National Natural Science Foundation of China (No. 51607130), National Key Research and Development Program (No. 2016YFB0900104) and National Natural Science Fund for Excellent Young Scholars (No. 51322704). |
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Abstract: |
This paper presents an improved virtual synchronous
control (VSynC) for the grid-connected voltage
source converter (VSC) so as to continuously operate under
the grid voltage with steady unbalance. The improved
VSynC introduces the negative sequence power controls on
basis of conventional VSynC. The improved VSynC is
capable of regulating the negative sequence internal voltage
to reduce the negative-sequence injected currents and
oscillated powers of the VSC aroused by the negative-sequence
grid voltage. Three alternative local control
objectives for the VSC itself under steady state unbalanced
grid conditions and their corresponding power references
are deduced and computed. Simulated and experimental
results are presented to validate the correctness and effectiveness
of the proposed improved VSynC to enhance the
continuous operation performance of VSynC-based VSCs
during grid voltage steady-state unbalance. |
Keywords: |
Grid voltage unbalance, Virtual synchronous
control (VSynC), Grid-connected voltage source converter
(VSC) |
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Online Time:2019/01/28 |
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