计及铁心损耗和磁滞效应改进的变压器模型

分析电力系统暂态过程或铁磁谐振等问题时,建立变压器精确的等效非线性模型非常关键。基于变压器的空载实验,利用非线性电阻和考虑磁滞效应的非线性电感的并联来等效变压器铁心励磁支路,并给出了变压器的等效电路模型和励磁支路参数特性的计算方法。在工频条件下,分别建立了模型变压器和单相三柱变压器JMB-500的等效模型,计算结果与测量结果吻合很好。最后,建立了模型变压器在不同频率下的等效模型,该文的计算结果与测量结果也同样吻合,证明了该文方法的有效性和准确性。

An Improved Transformer Model Considering of the Losses and Hysteresis of the Core

In order to analyze the power system transient process or ferromagnetic resonance problems, a precise equivalent nonlinear model of a transformer is important. Based on no-load transformer test, an equivalent circuit model of the transformer and a calculation method of magnetizing branch parameter are proposed, which uses nonlinear resistors and parallel connection between inductance considering nonlinear and hysteresis. The equivalent circuit of a model transformer magnetizing branch circuit model is implemented through no-load test measurement in the paper. The calculated results are found to be in good agreement with the measured data. Simultaneously, this method is also used to establish a circuit model of an origin single-phase three-limb transformer, JMB500. Again, and the computed results agree well with the measured data. Finally, the equivalent circuits of transformer model are obtained at different frequencies and the comparison between the computed data and the measured data also shows good agreement, which proves the validity and accuracy of the modeling method proposed in this paper.