電力電子變壓器中高頻變壓器磁芯和繞組特性的研究
[Abstract]:Power electronic transformer (Power Electronic Transformer,) is a new type of transformer. It can reduce the volume and weight of traditional transformer by means of power electronic device and power electronic transformation technology to convert and control the energy. The purpose of saving materials and saving energy is realized. High frequency transformer is the core device of PET. It plays the role of isolating and transmitting power. Its performance directly determines the performance of PET. The transformer with poor performance has a large loss and low efficiency, which affects the stability and reliability of the system circuit, and even causes the failure of the power electronic device, which leads to the failure of the energy conversion. In this paper, the research difficulties of high frequency transformer are defined, its equivalent circuit is analyzed, and the characteristic experiment of high frequency magnetic material is carried out. The 10kVA high-frequency transformer with different windings is designed, and its electromagnetic parameters, no-load characteristics and short-circuit characteristics are measured and studied. A high frequency transformer for 20 kHz 10 kVA photovoltaic inverter system has been fabricated. First of all, the equivalent circuit and parameter calculation of high frequency transformer are analyzed. According to the law of electromagnetic induction, the experimental platform for testing the characteristics of high frequency magnetic material is designed, and the measurement results are analyzed, and the ferrite is obtained. The high frequency characteristics of amorphous alloy and nanocrystalline alloy under sinusoidal excitation are studied. Their magnetization curves and hysteresis loops are drawn, and the loss of magnetic material at different frequencies is calculated. The material characteristic data with reference value are provided for the design and manufacture of high frequency transformer. Secondly, the traditional loss model of magnetic material is analyzed. On the basis of the data obtained from the characteristic test of high frequency magnetic material, the high frequency core loss model of nanocrystalline magnetic core is obtained, that is, high frequency coercivity, high frequency core loss and maximum flux density. The relation of frequency. Based on 3D fitting, a method of determining high frequency core loss based on Steinmez (Steinmetz) coefficient is proposed, which provides a powerful reference basis for the selection of core materials for high frequency transformers. Finally, the high frequency effect of high frequency transformer windings under different conditions and the influence of different winding structures on the electromagnetic parameters of high frequency transformer are analyzed and calculated by finite element method. A prototype of two kinds of windings (sandwich type, cross transposition type) is designed and completed. By measuring their electromagnetic parameters and analyzing their characteristics, the advantages of cross-transposition winding technology to reduce the loss of high frequency transformer are determined. Based on the above experimental research, a high-frequency transformer for 20kHz 10kVA photovoltaic inverter system is developed. The high frequency transformer adopts an improved cross-transposition structure, and its efficiency can reach 99.3%.
【學(xué)位授予單位】:河北工業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM433
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