Power electronic transformer design method

Abstract

The invention relates to a power electronic transformer design method. The method comprises the following steps of 1, establishing a power electronic transformer hardware topology model containing a resonance network; 2, carrying out fundamental wave analysis modeling and steady-state analysis on a power electronic transformer containing the resonance network, and obtaining the normalized direct-current voltage gain Gn of the transformer; 3, respectively deducing the relationship between the resonance parameter of the transformer and the DC voltage gain, the input impedance and the conversionefficiency of the transformer; and 4, optimizing the values of the resonance parameters Lr and Lm by adopting an intelligent bird flock search algorithm, and obtaining the optimal values of Lr and Lmfor the conversion efficiency of the transformer. Aiming at the problems of local optimum, low precision and the like of the resonance network, the intelligent bird flock algorithm is adopted to optimize a current target function, and the local optimum is avoided, so that the requirements of the power electronic transformer for realizing voltage-stabilizing output and high power density in a full-load range under different input conditions are met.

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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