大地直流偏磁影响下电力变压器损耗及温升计算研究  

Research on loss and temperature rise calculation method of power transformer under the influence of geomagnetically induced current

作　　者：邢军强 王菲 韩刚 邱巍 于力 Xing Junqiang;Wang Fei;Han Gang;Qiu Wei;Yu Li(School of Electric Power Shenyang Institute of Engineering,Shenyang 110136;Liaoshen Industries Group Co.,Ltd,Shenyang 110144)

机构地区：[1]沈阳工程学院电力学院,沈阳110136 [2]辽沈工业集团,沈阳110144

出　　处：《电气技术》2020年第1期20-24,30,共6页Electrical Engineering

摘　　要：地磁感应电流引起的直流偏磁对电网稳定运行会产生不利影响,其中单相变压器、三相五柱电力变压器受到的影响最为严重。本文根据IEEE Std C57.91标准,以一台OSFSZ-420000/354三相电力变压器为研究对象,研究地磁感应电流直流偏磁下对电力变压器磁化电流和磁场温升的计算方法及相应解决方案。传统解析方法难以模拟地磁感应电流直流偏磁引起的变压器饱和特性变化。本文通过有限元与PSCAD迭代联合计算,研究地磁感应电流影响的电力变压器运行特性的变化,首先基于有限元研究变压器铁心饱和运行条件下励磁特性计算方法,基于变压器铁心饱和特性曲线搭建PSCAD的地磁感应电流影响下磁化电流仿真模型,最终基于PSCAD与三维涡流场耦合分析,提出地磁感应电流影响下的变压器损耗及温升计算方法。The DC bias induced by geomagnetically induced current(GIC)has adverse effects on the operation of power grid,among which single-phase transformer and three-phase five-pillar power transformer are most seriously affected.According to IEEE Std C57.91 standard,the paper takes an OSFZSZ-420000/354 power transformer as the research object to study the calculation method of magnetization current and magnetic field temperature rise of power transformer under GIC.Traditional analysis method is difficult to simulate transformer saturation characteristic change under the GIC.Through the finite element with PSCAD iterative calculation,this paper studies the changes of characteristic of the power transformer operation influenced by magnetic induction current(GIC).First,on the basis of the finite element study of transformer core saturation excitation characteristics calculation method under the condition of operation,then based on the transformer core saturation characteristic curve to establish PSCAD GIC simulation model under the influence of magnetizing current,and finally through PSCAD and 3D eddy current field coupling analysis,this paper explores the transformer loss under the influence of the GIC and method to calculate the temperature.

关 键 词：电力变压器 地磁感应电流 PSCAD 

分 类 号：TM41[电气工程—电器]