考虑磁通波形特征的谐波磁损耗计算方法及验证  

Calculation and Verification of Harmonic Magnetic Loss Considering Magnetic Flux Waveform Characteristics

作　　者：赵志刚[1,2] 徐曼[1,2] 胡鑫剑 马习纹 张鹏[1,2] ZHAO Zhigang;XU Man;HU Xinjian;MA Xiwen;ZHANG Peng(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Hongqiao District,Tianjin 300132,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province(Hebei University of Technology),Hongqiao District,Tianjin 300132,China)

机构地区：[1]省部共建电工装备可靠性与智能化国家重点实验室(河北工业大学),天津市红桥区300132 [2]河北省电磁场与电器可靠性重点实验室(河北工业大学),天津市红桥区300132

出　　处：《电网技术》2021年第2期811-817,共7页Power System Technology

基　　金：国家自然科学基金项目(51677052)。

摘　　要：考虑到当前电力系统中变压器铁心损耗计算复杂的问题,提出一种用于谐波激励条件下变压器铁心损耗计算的改进Bertotti损耗模型。首先根据变压器的实际运行情况,基于正弦激励条件下测量的实验数据,采用数值拟合法确定修正的Bertotti损耗模型的系数。之后,综合考虑谐波相位、含量、阶次的变化对材料磁性能的影响,引入磁滞、涡流、剩余损耗修正因子对正弦条件下确定的Bertotti损耗模型进行修正,得到改进的Bertotti损耗模型。最后,在多种工况下将改进的Bertotti损耗模型计算得到的损耗值,与叠片铁心模型测量得到的损耗值进行对比,结果表明,所提模型在谐波激励条件下具有良好的适用性,并且能考虑局部磁滞回环对铁心损耗的影响,计算误差小于8%,满足工程上的精度要求,验证了所提改进Bertotti模型的有效性与适用性。Considering the complexity of core loss calculation in current power system, an improved Bertotti loss model for core loss calculation under harmonic excitation is proposed. Firstly, according to the actual operation of the transformer, the coefficients of the corrected Bertotti loss model are determined through the fitting model method based on the experimental data measured under the sinusoidal excitation conditions. Then, considering the influence of the changes of the harmonic phases, the contents and the orders on the magnetic properties of the material, the improved Bertotti loss model is obtained via introducing the correction factors of hysteresis, eddy current and excess loss under the sinusoidal condition. Finally, the loss data calculated by the improved Bertotti loss model are compared with those measured by the laminated core model under various working conditions. The results show that the model proposed in this paper has good applicability under harmonic excitation. Its calculative errors are less than 8% concerning the effect of the local hysteresis loops, which satisfies the engineering accuracy requirement. Then the validity and applicability of the improved model are verified.

关 键 词：变压器铁心 损耗模型 谐波激励 磁特性 

分 类 号：TM14[电气工程—电工理论与新技术]