[1] Yang Nan, Zhu Zimin, Yuan Tiejiang, et al. Research on resonance fault caused by dc magnetic biasing in ultrahigh voltage transformer with parallel static var compensator [J]. Journal of Southeast University (English Edition), 2020, 36 (3): 301-312. [doi:10.3969/j.issn.1003-7985.2020.03.008]

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Research on resonance fault caused by dc magnetic biasing in ultrahigh voltage transformer with parallel static var compensator()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 03

Page:

301-312

Research Field:

Electrical Engineering

Publishing date:

2020-09-20

Info

Title:

Research on resonance fault caused by dc magnetic biasing in ultrahigh voltage transformer with parallel static var compensator

Author(s):

Yang Nan¹;  Zhu Zimin²;  3;  Yuan Tiejiang¹

¹School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
²School of Electrical Engineering, Xinjiang University of Technology, Urumqi 830046, China
³Electric Power Research Institute, State Grid Xinjiang Electric Power Company, Urumqi 836500, China

Keywords:

static var compensator;  ultra-high voltage transformer;  magnetic biasing;  resonance fault

PACS:

TM76

DOI:

10.3969/j.issn.1003-7985.2020.03.008

Abstract:

For dealing with the resonance fault of ultra-high voltage transformers(UHVTs)with the parallel thyristor controlled reactor(TCR)+ the filter compensator(FC)type static var compensator(SVC)caused by dc magnetic biasing, a simulation model of UHVT with parallel SVC for the frequency analysis of the impedance characteristics and a magnetic-field coupling model for UHVT based on classic Jiles-Atherton hysteresis theories are constructed based on the MATLAB/Simulink platform. Both the theoretical and simulation results prove that the resonance fault is caused by the resonance point on the low-voltage side of the transformer, which will approach the 4th harmonic point under magnetic biasing. Based on the fault analysis, a new resonance control method is proposed by adding reactance with by-pass switches in series with FC branches. Under dc magnetic biasing, the cutoff of the by-pass switch will increase the series reactance rate of the FC branches and change the resonance point. In order to avoid the 7th harmonic increasement caused by this method, the firing angle of the TCR branches is locked between 130° and 180°. The effect of the proposed method is validated by the simulation model of a 750 kV UHVT and the results show that the mechanism analysis of the resonance fault is correct and the resonance control method is valid.

References:

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Memo

Memo:

Biographies: Yang Nan(1990—), male, doctor, yangn1@dlut.edu.cn; Yuan Tiejiang(corresponding author), male, doctor, professor, ytj1975@dlut.edu.cn.
Foundation item: The Science Foundation of State Grid Xinjiang(No.SGTYHT/19-JS-215).
Citation: Yang Nan, Zhu Zimin, Yuan Tiejiang.Research on resonance fault caused by dc magnetic biasing in ultra high voltage transformer with parallel static var compensator[J].Journal of Southeast University(English Edition), 2020, 36(3):301-312.DOI:10.3969/j.issn.1003-7985.2020.03.008.

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