A Design Method for Power Electronic Transformer

Abstract

The invention relates to a method for designing a power electronic transformer. The method includes the following steps: the first step is to establish a hardware topology model of a power electronic transformer including a resonant network; model and conduct steady-state analysis to obtain the normalized DC voltage gain G of the transformer n ; The third step is to deduce the relationship between the resonance parameters of the transformer and the DC voltage gain, input impedance and conversion efficiency of the transformer respectively; r , L m The value is optimized, and L is obtained for the conversion efficiency of the transformer r , L m preferred value. Aiming at the problems of local optimum and low precision in the resonant network, the invention uses the intelligent bird swarm algorithm to optimize the current objective function to avoid falling into local optimum, so that the power electronic transformer can be realized under different input conditions and within the full load range. Regulated voltage output and high power density requirements.

Description

technical field [0001] The invention relates to the technical field of a transformer design method, and relates to an optimization method for improving the performance of a power electronic transformer. Background technique [0002] Power Electronic Transformer (Power Electronic Transformer, PET), also known as Solid State Transformer (Solid State Transformer, SST). It is a high-frequency power equipment based on power electronic conversion technology composed of power electronic transformers and medium-high frequency transformers. The core of the power electronic transformer is a high-frequency DC-DC transformer. The higher the switching frequency, the more significant the switching loss of the power switch tube. In order to reduce switching loss, a resonant circuit is usually used to make the switching device operate in a soft switching state. The soft switching performance of power electronic transformers is directly related to the selection of resonance parameters and ...

AI Technical Summary

Problems solved by technology

This type of method can accurately design the resonance parameters, but because the operation process of the resonance network is very complicated, the modal analysis method is cumbersome and is not suitable for promotion in the engineering field

In addition, there are few overall analyzes on the parameter design and output efficiency of power electronic transformers with different input voltage ranges, but this is exactly the problem that the current engineering needs to solve

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