DOI:10.1007/s40565-017-0372-2 |
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Application of thyristor controlled phase shifting transformerexcitation impedance switching control to suppress short-circuitfault current level |
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Net amount: 857 |
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Author:
Jun LIU1 , Xudong HAO1
, Xu WANG1
, Yefu CHEN1
,
Wanliang FANG1
, Shuanbao NIU2
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Author Affiliation:
1. Shaanxi Key Laboratory of Smart Grid, State Key Laboratory
of Electrical Insulation and Power Equipment, School of
Electrical Engineering, Xi’an Jiaotong University, Xi’an
710049, China
2. Northwest Subsection of State Grid Corporation of China,
Xi’an 710048, China
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Foundation: |
This work was supported in part by National
Natural Science Foundation of China (No. 51507126) and in part by
National Key Research and Development Program of China (No.
2016YFB0901903). |
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Abstract: |
Short-circuit fault current suppression is a very
important issue in modern large-interconnected power
networks. Conventional short-circuit current limiters, such
as superconducting fault current limiters, have to increase
additional equipment investments. Fast power electronics
controlled flexible AC transmission system (FACTS)
devices have opened a new way for suppressing the fault
current levels, while maintaining their normal functionalities
for steady-state and transient power system operation
and control. Thyristor controlled phase shifting transformer
(TCPST) is a beneficial FACTS device in modern power
systems, which is capable of regulating regional power
flow. The mathematical model for TCPST under different
operation modes is firstly investigated in this study. Intuitively,
the phase shifting angle control can adjust the
equivalent impedance of TCPST, but the effect has been
demonstrated to be weak. Therefore, a novel transformer
excitation impedance switching (EIS) control method, is
proposed for fault current suppressing, according to the
impedance characteristics of TCPST. Simulation results on
IEEE 14-bus system have shown considerable current
limiting characteristic of the EIS control under various
fault types. Also, analysis of the timing requirement during
fault interruption, overvoltage phenomenon, and ancillary
mechanical support issues during EIS control is discussed,
so as to implement the proposed EIS control properly for
fast fault current suppression. |
Keywords: |
Excitation impedance switching (EIS) control,
Interruption time sequence, Phase shifting angle (PSA)
control, Short-circuit fault current suppression, Thyristorcontrolled
phase shifting transformer (TCPST) |
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Online Time:2018/07/20 |
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