东南大学学报（英文版）2020，Vol.36Issue(3)：301-312,12.DOI:10.3969/j.issn.1003-7985.2020.03.008
直流偏磁引起的并联SVC特高压变压器谐振研究
Research on resonance fault caused by dc magnetic biasing in ultra high voltage transformer with parallel static var compensator
摘要
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 130o 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.关键词
静止无功补偿器/特高压变压器/直流偏磁/谐振故障Key words
static var compensator/ultra-high voltage transformer/magnetic biasing/resonance fault分类
信息技术与安全科学引用本文复制引用
杨南,朱子明,袁铁江..直流偏磁引起的并联SVC特高压变压器谐振研究[J].东南大学学报（英文版）,2020,36(3):301-312,12.基金项目
The Science Foundation of State Grid Xinjiang (No.SGTYHT/19-JS-215). （No.SGTYHT/19-JS-215）
