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| Research and Verification of Nanocrystalline Core Loss Model Considering PWM Waveform Characteristics |
| Zhao Zhigang1,2, Jia Huijie1,2, Liu Zhaoyang1,2, Zhao Anqi1,2, Gao Pengxu1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300401 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300401 China |
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Abstract 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 core loss model established in this paper are compared with the experimental values to verify the model. The overall calculation accuracy is improved by 25% compared with the improved Steinmetz formula.
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Received: 17 November 2022
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2024, Vol. 39 
