DOI:https://doi.org/10.1007/s40565-018-0459-4 |
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Current-limiting characteristics of saturated iron-core fault current limiters in VSC-HVDC systems based on electromagnetic energy conversion mechanism |
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Net amount: 744 |
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Author:
Botong LI1, Hanqing CUI1, Fangjie JING1, Bin LI1, Yichao LIU1
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Author Affiliation:
1. Key Laboratory of Smart Grid of Ministry of Education,
Tianjin University, Tianjin 300072, China
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Foundation: |
This research work was supported in part by the
National Key R&D Program of China (No. 2018YFB0904600), and
in part by the National Nature Science Foundation of China (NSFC)
under Grant 51677125. |
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Abstract: |
A common method to examine the current-limiting
performance of saturated iron-core fault current limiter
(SI-FCL) in high-voltage direct-current transmission
based on voltage source converter (VSC-HVDC) systems
is to solve differential equations based on the system fault
transient characteristics and the equivalent inductance
calculation equation. This method analyzes the fault current
of the VSC-HVDC system in the time domain. However,
it is computationally complex and cannot directly
reflect the relationship between parameters and the currentlimiting
effect of the SI-FCL. In this paper, the relationship
between the magnetic flux density and magnetic field
energy of the SI-FCL is analyzed. The energy exchange
between the DC capacitor and the SI-FCL in the DC short
circuit fault process is analyzed. From the perspective of
electromagnetic energy conversion, the criterion for
determining the current-limiting ability of the SI-FCL in
the transient process is given based on the parameters of
the SI-FCL and VSC-HVDC system. On this basis, the
characteristics of the DC side fault current and the capacitor
voltage when the SI-FCL has current-limiting ability
are examined. Based on the parameters of the SI-FCL and
VSC-HVDC system, a method for calculating the fault
current peak value and capacitor voltage drop time is
given. Finally, the accuracy of the analysis of the SI-FCL
in the VSC-HVDC system based on the electromagnetic
energy conversion mechanism is demonstrated through a
case study and simulation results of the VSC-HVDC system
with different SI-FCLs. |
Keywords: |
Electromagnetic energy, Saturated iron-core
fault current limiter (SI-FCL), High-voltage direct-current
transmission based on voltage source converter (VSCHVDC)
system, Fault analysis |
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Online Time:2019/03/08 |
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