Improvement of Core Loss Calculation Method and Simulation Application under Sinusoidal and Harmonic Excitations
Liu Gang1,Sun Lipeng1,Wang Xuegang2,Liu Lanrong2,Li Lin13
1. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China；
2. Baoding Tianwei Baobian Electric Co. Ltd Baoding 071056 China；
3. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
The wide application of power electronic equipment leads to an increase of excitation harmonics in the windings with iron core, which makes it difficult to get accurate core loss. In order to calculate the core loss with better accuracy, three core loss calculation models are analyzed and compared in this paper firstly. Based on the Bertotti loss model, the high-order terms of the magnetic induction intensity in the hysteresis loss variable are introduced to improve the fitting accuracy. The loss characteristics of silicon steel sheet under sinusoidal and harmonic excitations were measured by a single sheet tester. The fitting precisions of three loss models were analyzed and the errors were calculated. Finally, considering the difference in the magnetic characteristics of the actual transformer’s laminated core and silicon steel sheets, a product-level laminated core model was built in this paper, and its loss under sinusoidal and harmonic excitations was measured. The magnetic field finite element software MagNet was applied to simulate the flux density distribution, and then the field quantity of each unit in the simulation model was extracted and the core loss was calculated by the improved Bertotti loss model. The results show that the improved Bertotti loss model is of better accuracy than other methods.
刘刚，孙立鹏,王雪刚,刘兰荣,李琳. 正弦及谐波激励下的铁心损耗计算方法改进及仿真应用[J]. 电工技术学报, 2018, 33(21): 4909-4918.
Liu Gang,Sun Lipeng,Wang Xuegang,Liu Lanrong,Li Lin. Improvement of Core Loss Calculation Method and Simulation Application under Sinusoidal and Harmonic Excitations. Transactions of China Electrotechnical Society, 2018, 33(21): 4909-4918.
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2018, Vol. 33 
