Analysis Of Electromagnetic Force Of Windings In High-Capacity High-Frequency Transformers

With the development of smart grid, wind farm grid and other DC distribution grid, high power DC-DC converter technology has been widely used. High-capacity and high-frequency(HCHF) power transformer with electrical isolation and high power density and high efficiency advantages is one of the core components of DC-DC converter.Research on HCHF transformer design has significance on the development of high power DC-DC converter. Compared with traditional power transformer, HCHF transformer has advantages on volume and weight. Higher working frequency increases the power density of transformer, thus greatly reducing the size and weight. Materials and costs are saved as well as the occupied space of transformer decreased, which makes it easier to transport and more fitting in offshore wind farm power system.Transformer is one type of very important and expensive equipment in power system. It not only affects the stability of its their own security,but also affects the entire power system. Calculating electromagnetic force of transformer windings is a very important step in transformer design and manufacturing. It has been a key issue for design engineers. The transformer fault is mainly because the windings don’t have enough strength. The windings may not bear the sudden force under the short-circuited current impact. Therefore, it is particularly important to calculate the forces of winding through the analysis of internal magnetic field distribution with computer software.In this paper, the finite element mothed simulation tools are used.HCHF transformer model is built and the leakage inductances of windings and the short-circuited current are calculated. Finally, the magnitude and distribution of winding electromagnetic forces are obtained. This paper is consultative in high capacity high frequency transformer design.