基于Jiles Atherton磁滞理论的直流偏磁下铁心损耗预测

发布时间：2018-07-13 07:46

【摘要】：直流偏磁下,变压器励磁电流畸变、损耗显著增加,导致变压器局部过热甚至绝缘老化。为了研究直流偏磁对变压器铁心损耗的影响,该文基于Jiles Atherton(JA)理论提出了一种新的铁心损耗预测方法。首先,在JA静态铁心磁滞模型基础上,依据铁心损耗分离理论,在无偏磁下建立考虑涡流损耗与异常损耗的铁心动态磁滞模型,并对模型中参数进行辨识;其次,采用爱泼斯坦方圈和逆变电源搭建了直流偏磁下磁滞回线测量系统,实测了不同直流偏磁下的磁滞回线,在此基础上获得直流偏磁下铁心动态磁滞模型参数辨识结果;最后分析了直流偏磁对模型参数的影响,并对模型参数中的动态损耗系数进行了拟合,以修正铁心动态磁滞模型,得到直流偏置下铁心损耗预测方法。通过算例的计算结果与实验结果的对比验证了文中所提出方法的正确性。
[Abstract]:Under DC bias, transformer excitation current distortion and loss increase significantly, leading to local overheating and even insulation aging of transformer. In order to study the effect of DC bias magnetic field on transformer core loss, a new core loss prediction method based on Jiles Atherton (JA) theory is proposed in this paper. Firstly, on the basis of JA static core hysteresis model and according to the core loss separation theory, the core dynamic hysteresis model considering eddy current loss and abnormal loss is established under unbiased magnetic field, and the parameters of the model are identified. The measurement system of hysteresis loop under DC bias magnetic field is built by using Epstein square loop and inverter power supply. The hysteresis loop under different DC bias magnetic field is measured. On this basis, the parameter identification results of the dynamic hysteresis model for the core under DC bias magnetic field are obtained. Finally, the influence of DC bias on the model parameters is analyzed, and the dynamic loss coefficient of the model parameters is fitted to modify the core dynamic hysteresis model, and the prediction method of the core loss under DC bias is obtained. The correctness of the proposed method is verified by the comparison of the calculation results with the experimental results.
【作者单位】：山东大学电气工程学院;
【基金】：山东省科技发展计划资助(13ny15)~~
【分类号】：TM41

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