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[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()
直流偏磁引起的并联SVC特高压变压器谐振研究
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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
直流偏磁引起的并联SVC特高压变压器谐振研究
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
杨南1;  朱子明2;  3;  袁铁江1
1大连理工大学电气工程学院, 大连 116024; 2新疆大学电气工程学院, 乌鲁木齐 830046; 3国网新疆公司电力科学研究院, 乌鲁木齐 836500
Keywords:
static var compensator;  ultra-high voltage transformer;  magnetic biasing;  resonance fault
静止无功补偿器;  特高压变压器;  直流偏磁;  谐振故障
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.
针对直流偏磁引起的并联TCR+FC型SVC特高压变压器谐振问题, 基于MATLAB/Simulink平台, 构建了用于阻抗频率特性分析的并联SVC的特高压变压器仿真模型与基于经典Jiles-Atherton磁滞理论的变压器场路耦合仿真模型.理论和仿真结果表明, 特高压变压器并联谐振的形成机理为直流偏磁情况下, 并联SVC投入运行时, 变压器低压侧谐振点趋近于4次谐波.基于此, 提出一种谐振控制思路, 即在原FC滤波支路上串联含旁路开关的电抗器.在直流偏磁下, 旁路开关的切断可以提升FC滤波支路的串抗率, 从而改变并联谐振点.并针对此谐振控制方法带来的7次谐波问题, 提出了锁定TCR支路控制角在130°~180°区间的改进措施.以某750 kV特高压变压器为例, 验证了谐波控制方法对特高压变压器并联谐振的抑制作用, 仿真结果表明谐振故障机理的分析及其谐振控制方法是正确和可行的.

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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.
Last Update: 2020-09-20