A Multiscale Modeling Method for Power Electronic Converters Based on Coarse and Fine Scale Transformation

Abstract

A multi-scale modeling method for power electronic converters based on coarse and fine scale transformation. Firstly, a single-scale model of power electronic converters at different scales is established to obtain the expression of multi-scale processes at different scales; then, based on wavelet multi-scale The coarse and fine scale transformation in the analysis theory reconstructs the multi-scale process in the power electronic converter, and integrates the expression of the multi-scale process in different scale models; then finds the correlation function between variables on different scales, and establishes different scale models Inter-coupling relationship; finally, the expression of the reconstructed multi-scale process is substituted into the single-scale model or coupling relationship, and the model or coupling relationship is corrected, thus obtaining the required multi-scale model. Compared with the traditional single-scale modeling, the method of the present invention can reflect the dynamic characteristics of the power electronic converter on multiple scales and can reflect the changes in the dynamic characteristics of the converter when considering the phenomena on multiple scales at the same time, and the simulation results are more accurate. fit the actual situation.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a multi-scale modeling method for power electronic converters based on coarse and fine scale conversion. Background technique [0002] Power electronic converters have dynamic processes that exist on multiple scales such as device-level and circuit-level scales during operation. At present, the simulation modeling of power electronic converters usually adopts single-scale modeling, and each model is only for local specific problem, and choose to ignore other phenomena. The state-space averaging method adopted at the circuit level can intuitively and clearly describe the input-output relationship and internal dynamic characteristics of the converter, but the impact of power electronic devices such as IGBTs on system stability and power loss cannot be ignored. However, the microscale model established only for the device cannot reflect the overall characteristi...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing single-scale simulation model, improve the problem that the numerical stability cannot be guaranteed in the process of solving the multi-scale model, and propose a multi-scale modeling method for power electronic converters based on coarse and fine scale transformation, which can It reflects the dynamic characteristics of the power electronic converter on multiple scales and can reflect the changes in the dynamic characteristics of the converter when considering the phenomena on multiple scales at the same time. The simulation results are more in line with the actual situation

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