基于MatLab的抑制变压器励磁涌流仿真研究

Simulation Study of Transformer Magnetizing Inrush Based on MatLab

以并联合闸电阻法、内插电阻法和选相分合闸技术,三种常用的抑制变压器励磁涌流的方法为例,利用MatLab/Simulink仿真软件搭建变压器模型,详细分析了合闸初相角、接地电阻对空载变压器合闸时的励磁涌流的影响,仿真分析结果表明,采用并联合闸电阻法时涌流衰减速度最快,而采用选相分合闸技术时涌流衰减的效果最好,但需要配合内插电阻法以提高时间准确度并降低操作难度。

Three common methods to suppress the inrush current,interpolation resistance method,parallel switch in resistance method and phase identificated switch on/off technique,are taken in MatLab/Simulink simulation to construct the models of three-phase transformers,the impacts of original switch phase angle and earth resistance on no-load transformer switching are analyzed.Simulation results shows the attenuation is the fastest while adopting the interpolation resistance method;whereas the attenuation effect is the best while adopting the phase identificated switch on/off technique,but it required coordination by interpolation resistance method to improved the time accurac and to reduce the operation difficulty.