DOI:10.1007/s40565-017-0333-9 |
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Transient stability enhancement of DC-connected DFIG and itsconverter system using fault protective device |
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Net amount: 967 |
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Author:
Shaomin YAN1,2, Aimin ZHANG3
, Hang ZHANG1
, Jianhua WANG1,
Bin CAI2
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Author Affiliation:
1 School of Electrical Engineering, Xi’an Jiaotong University,
Xi’an, China
2 School of Engineering, Qufu Normal University, Rizhao,
China
3 School of Electronic and Information Engineering, Xi’an
Jiaotong University, Xi’an, China
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Foundation: |
This work was supported by Natural Science
Foundation of China (No. 61473170) and Key R&D Plan Project of
Shandong Province, PRC (No. 2016GSF115018). |
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Abstract: |
Transient stability of doubly-fed induction generators
(DFIGs) is a major concern in both AC and DC
grids, and DFIGs must stay connected for a time during
grid faults according to the power grid requirements. For
this purpose, this work proposes an overcurrent and overvoltage
protective device (OCV-PD) to ensure that DCbased
DFIG system can stay connected and operate well
during the faults. Compared with a series dynamic braking
resistor (SDBR), two aspects are improved. First, a twolevel
control strategy and DC inductor circuit are used to
ensure that the OCV-PD can limit the current impulse to
protect DFIG system during an overcurrent fault. Second,
the OCV-PD can protect system from overvoltage fault
which a SDBR cannot do. Simulation results verify its
validity and feasibility, finding that for overcurrent protection
the OCV-PD outperforms a SDBR with an average
decreased index of 3.29%, and for overvoltage protection it
achieves an average index of 1.02%. |
Keywords: |
Transient stability, Doubly-fed induction
generator (DFIG), Overcurrent and overvoltage protective
device (OCV-PD), DC grid, Series dynamic braking
resistor (SDBR) |
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Online Time:2017/11/27 |
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