摘要
为了精确地对变压器饱和进行仿真并建立变压器饱和模型,提出了一种基于统一磁路(UMEC)模型及空载试验的变压器饱和新模型。该模型利用UMEC来表示磁路中各个磁导之间的关系,并采用变压器空载试验获得电压、电流有效值曲线和功率损耗曲线,通过分段线性化方法得到变压器励磁磁导与电流之间的关系而近似表示磁路的饱和。该模型充分利用了UMEC模型的优点,如无需绕组匝数、铁芯横截面积和铁芯长度,以及UMEC模型中铁芯磁导和铁轭磁导之间存在的关系,使得通过励磁支路的非线性也间接地反映了铁轭的非线性;同时,其励磁支路的非线性只需通过简单的变压器空载试验就可获得。仿真计算表明,该方法既具有较高的仿真精度,且由于参数易得,在实际工程中推广使用方便。
To accurately simulate transformer saturation and to establish a transformer saturation model,based on UMEC（Unified Magnetic Equivalent Circuit） model and the no-load experiment,a new model considering the magnetic circuit saturation characters of the transformer is proposed.The model uses the UMEC model to describe the relationship of each permeance of magnetic circuit,and the curve of voltage /current and the curve of power loss gained by the no-load experiment are piecewise lined to approximately achieve the relationship of the transformer excitation permeance and excitation current.The advantages of the UMEC model such as needing no winding turns,core cross-sectional area and the length and so on,as well as the relationship between core permeance and yoke permeance,are fully utilized by the model,so that the nonlinearization of the yoke can also be indirectly considered through the nonlinearization of excitation branch;meanwhile,the nonlinearization of excitation branch can be easily obtained by the simple no-load experiment.The simulation results demonstrate that the model possesses high precision,and is conveniently applied for the practical engineering due to the needed parameters being easily obtained.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第2期422-428,共7页
High Voltage Engineering
关键词
变压器模型
磁路饱和
磁导非线性
UMEC
分段线性化
空载试验
transformer mode
magnetic circuit saturation
nonlinear permeance
UMEC
piecewise linearization
no-load experiment
