考虑PWM波形特征的纳米晶磁心损耗模型的研究及验证  

Research and Verification of Nanocrystalline Core Loss Model Considering PWM Waveform Characteristics

作　　者：赵志刚[1,2] 贾慧杰 刘朝阳 赵安琪 高鹏旭 Zhao Zhigang;Jia Huijie;Liu Zhaoyang;Zhao Anqi;Gao Pengxu(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology,Tianjin 300401 China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology,Tianjin 300401 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300401 [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300401

出　　处：《电工技术学报》2024年第6期1602-1612,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51677052,52077053);河北省人才工程培养项目(A201902009)资助。

摘　　要：磁心损耗精确预测对于电力电子变压器的优化设计至关重要。然而,传统的磁心损耗模型在复杂激励下适用性较差,尤其对于占空比可调、高次谐波含量丰富的PWM波磁心损耗预测,计算精度显著下降。基于Jordan损耗分离模型,建立了一种考虑PWM波形特征的磁心损耗计算方法。首先,该方法根据激励波形特征,推导出相应的波形系数及等效频率来计算PWM波激励下的动态涡流损耗,将Jordan模型的适用范围从正弦拓展到PWM波激励下的磁心损耗计算;然后,分析了不同占空比激励下激励波形有效频率及高次谐波含量变化对损耗系数的影响,并对其进行数学表征,实现了整个占空比范围内磁心损耗的精确预测;最后,搭建了高频非正弦激励下软磁材料磁特性测量平台,针对1K107B纳米晶材料,测量了两种典型PWM波激励下的损耗数据。实验结果表明,所建立的磁心损耗模型具有较高的计算精度,相比于传统的Steinmetz改进公式,整体精度提高了25%。As an important component of the total loss,accurate prediction of core loss is essential for the optimal design of power electronic transformers,.However,the traditional core loss model has the following problems.(1)It has high calculation accuracy only under the specific excitation waveform and is not universal.(2)The model parameters are seriously affected by frequency,and the identification process is complicated.(3)The effect of the change of the effective frequency of the excitation waveform and the high harmonic content on the core loss under different duty cycles is not considered.As a result,the traditional loss model has poor applicability under complex excitation,especially for PWM wave core loss prediction with adjustable duty cycle and rich high harmonic content,and the calculation accuracy is significantly reduced.The Jordan loss separation model decomposes the core loss under sinusoidal excitation into static hysteresis loss and dynamic eddy current loss,which has the advantages of clear physical meaning and few parameters.In this paper,based on the Jordan loss separation model,a core loss calculation method that can take into account the PWM waveform characteristics is established.Based on the core loss measurement data under sinusoidal excitation,the two-frequency method is used to identify the loss parameters of the Jordan model.Then,according to the excitation waveform characteristics,the corresponding waveform coefficients and the weighted average magnetic induction intensity change rate are derived to calculate the dynamic eddy current loss under PWM wave excitation.The applicability of the Jordan model is extended from sine to core loss calculation under PWM wave excitation.The influence of the effective frequency and high harmonic content on the loss coefficient is analyzed under different duty cycle excitations.Finally,a platform is built to measure the magnetic properties of soft magnetic materials under high-frequency non-sinusoidal excitation.The calculated values of the high-frequency

关 键 词：纳米晶 磁心损耗 PWM波形特征 Jordan模型 

分 类 号：TM271[一般工业技术—材料科学与工程]