基于传输线模型的三相变压器直流偏磁仿真分析  

Simulation study for the three-phase transformer under DC bias based on the transmission-line model

作　　者：董霞[1,2] 刘志珍[1] 宁大海 甘信广 高一飞[2] 陈冉[2] 牟旭涛[4] 

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]山东城市建设职业学院,山东济南250014 [3]山东小鸭集团技术中心,山东济南250101 [4]山东电力研究院,山东济南250002

出　　处：《电力系统保护与控制》2012年第23期12-16,共5页Power System Protection and Control

基　　金：山东省高等学校科技计划项目(J09LG64)

摘　　要：建立了一种新的直流偏磁下三相变压器组的传输线模型。模型中,将变压器电路中的微分项离散,并应用Jiles-Atherton铁磁磁滞理论来描述铁芯的饱和以及磁滞效应。涡流损耗用含等值电阻的附加绕组替代,同时考虑绕组铜耗及漏磁等因素,从而使变压器模型得到充分完整的描述。最后利用牛顿-拉夫逊迭代方法,对直流偏磁下的三相变压器组进行了时域仿真计算,仿真结果证明所提出的计算模型能够准确的分析三相变压器组的直流偏磁现象。This paper proposes a novel transmission-line model （TLM） of three-phase transformer under DC bias. In the model, the differential terms in transformer circuit are discrete. The saturation characteristic and hysteresis effect are described on the basis of Jiles-Atherton ferromagnetic hysteresis theory, and the eddy-current losses resulting from the flux paths through legs are replaced by an equivalent resistance. Furthermore, the copper losses and leakage inductance of the primary and secondary windings are also included. At last, the Newton-Raphson technique is chosen to calculate the model. The results demonstrate the validity of the math models in analyzing the DC bias phenomenon of the three-phase transformer.

关 键 词：三相变压器 直流偏磁 B-H曲线 励磁电流 涡流损耗 

分 类 号：TM411.2[电气工程—电器]