Design method of high-frequency high-power three-phase transformer

Abstract

The invention discloses a design method of a high-frequency high-power three-phase transformer. The method comprises the following steps of: deriving an effective value expression ILA (rms) of windingcurrent iLA; deriving an expression of each order harmonic current component amplitude of the winding current iLA by adopting a fundamental wave analysis method; deducing high-frequency loss Pc of the iron core and high-frequency loss expressions Pwp and Pws of primary and secondary windings of the flat copper wire under six-step voltage excitation; deriving a leakage inductance L sigma (pri) expression of the high-frequency transformer adopting the flat copper wire; determining system parameters of the high-frequency three-phase transformer; creating a multi-objective optimization mathematical model with the efficiency eta and the power density Ps as optimization objectives, the maximum allowable temperature rise, the insulation level and the leakage inductance parameters as constraint conditions and the scanning parameters as independent variables so that transformer design is achieved through a free parameter scanning method. The leakage inductance parameter of the flat copper wirewinding can be accurately controlled, the power density and efficiency of the transformer are improved, and the calculation amount and calculation time required by optimization design are reduced.

Description

technical field [0001] The invention belongs to the field of high-frequency transformer design, and in particular relates to a high-frequency high-power three-phase transformer design method. Background technique [0002] The DC conversion stage of solid-state transformers is usually divided into non-isolated and isolated types. Although non-isolated DC / DC converters based on full power electronic devices can realize the bidirectional flow of high-power direct current, they cannot achieve electrical isolation. To solve the above problems, isolated DC / DC converters with magnetically coupled high-frequency transformers have received widespread attention. At present, single-phase or three-phase isolated dual active full bridge (Dual Active Bridge, DAB) DC / DC converters, which are suitable for high-power transmission and meet the two-way free flow of power, have been applied to the DC conversion stage of solid-state transformers. Single-phase or three-phase high-frequency tran...

AI Technical Summary

Problems solved by technology

The core topology of the high-frequency three-phase transformer test model is three-phase five-column type, the rated parameters are: 20kHz, 1.38kW, 54V / 380V, the core is ferrite, and the winding is Litz wire. About the design of high-frequency three-phase transformers Methods and implementations are not reported in detail

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