摘要
利用变压器时域场路耦合模型,首次对单相特高压变压器的主体变、调压变和补偿变3台变压器(简称"三变")进行联合仿真,分析了特高压变压器在受直流偏磁影响后电压电流波形的变化及3台变压器之间的相互影响关系。3台变压器线圈均具有小电阻大电感的特点,很小的直流电压计算误差也会在电路中的并联支路上引起较大的直流电流环流;同时小电阻大电感电路时间常数大,过渡过程长,增加了仿真计算的困难。在仿真分析中,通过在并联支路上人为增加串联电阻,配合电压补偿,缩短了过渡过程,减小了计算结果的误差,提高了计算效率。通过搭建特高压变压器缩比模型直流偏磁实验平台,验证了所提出的串联电阻电压补偿法和场路耦合模型的准确性。
For the first time, using the transformer field-circuit coupling model,we performed joint simulation for three transformers such as the main transformer, voltage-regulating transformer, and compensational transformer(referred to as "three transformers") of a single-phase UHV transformer, and analyzed the changes in voltage and current waveforms of an UHV transformer under DC bias and the relationship between three transformers. In the parallel circuit formed by the three transformers, due to the relative small resistance and large inductance in their coils, the effective resistance is tiny. The tiny resistance may cause a residual DC current to circulate in the current due to precision error in the simulation. Also, due to a relatively large temporal constant in the low-resistance circuit, simulation often consumes longer time than that of lower-voltage transformers.By attaching a resistor to the circuit and compensating in voltage parallel to the original circuit, the computational error is reduced, the transitional period is shortened, and the calculation efficiency is improved. The accuracy of the series resistance voltage compensation method and the field coupling model proposed in this paper is verified by constructing the DC bias experiment platform of the UHV transformer scale model.
作者
王泽忠
刘恪
李明洋
李冰
胥建文
赵九才
WANG Zezhong;LIU Ke;LI Mingyang;LI Bing;XU Jianwen;ZHAO Jiucai(Key Laboratory of High Voltage&EMC,North China Electric Power University,Beijing 102206,China;Guangdong Power Grid Company Foshan Poewr Supply Bureau,Foshan 528000,China;Shandong Power Equipment Co.,Ltd.,Jinan 250000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第12期4097-4105,共9页
High Voltage Engineering
基金
国家重点研发计划(2016YFC0800100)。
关键词
特高压变压器
直流偏磁
场路耦合
串联电阻
电压补偿
缩比模型
UHV transformer
DC-bias
field-circuit coupling
series resistance
voltage compensation
scale-reduced model
