Converter multi-scale modeling method based on microscopic and macroscopic description

A modeling method and multi-scale technology, applied in the direction of instruments, special data processing applications, electrical digital data processing, etc., can solve problems such as the inability to consider scales at the same time, long simulation time, poor numerical stability, etc., to ease calculation accuracy and calculation Efficiency, improved calculation accuracy, and less resource occupation

Active Publication Date: 2019-12-06
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, mathematical models describing power electronic systems have high-order nonlinearities and are often very rigid
The transient process of the nonlinear system can only be solved by the numerical solution method of the conventional diffe

Method used

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  • Converter multi-scale modeling method based on microscopic and macroscopic description
  • Converter multi-scale modeling method based on microscopic and macroscopic description
  • Converter multi-scale modeling method based on microscopic and macroscopic description

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Embodiment Construction

[0041] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0042] The present invention takes the buck converter as an example, specifically includes: input DC voltage source, multi-scale resistance model R 1 , the multiscale inductance model L 1 , the multiscale capacitance model C 1 , a multiscale diode model and a multiscale insulated gate bipolar transistor (IGBT) switching component model. where the multiscale resistance model R 1 Includes temperature and stress interface; multiscale inductance model L 1 Includes Temperature, Stress, and Electric Field interfaces; Multiscale Capacitance Model C 1 Contains temperature, stress and magnetic field interface; multiscale diode model contains temperature field, electric field, magnetic field and s...

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Abstract

The invention discloses a converter multi-scale modeling method based on microscopic and macroscopic description. The converter multi-scale modeling method comprises the steps: 1) selecting a topological structure and an auxiliary circuit of a converter, and analyzing the to-be-observed scale of the converter; (2) determining a level needing to be developed in research, and selecting a multi-scalecomponent according to the level; 3) selecting a physical field factor according to the converter operation environment; 4) determining a research mode by utilizing the information; 5) selecting components and nodes for multi-scale observation, and respectively setting a consistency observation point, a reliability observation point and a corresponding error rate delta; and (6) judging an error between the macroscale and a set reference value through an observation point, switching the microscale for calculation when the error of the macroscale is greater than a set error rate delta, and correcting parameters of the macroscale by utilizing an obtained result to finish data conversion between the scales. According to the converter multi-scale modeling method, the coupling relation betweentransient dynamic characteristics of all components and circuits is introduced into modeling of the power electronic converter, and accurate simulation, control and reliability analysis of the systemare achieved.

Description

technical field [0001] The invention relates to the technical field of electric energy converter design and reliability analysis, in particular to a multi-scale modeling method for converters based on microcosmic and macroscopic descriptions. Background technique [0002] Various dynamic problems with unknown mechanisms continue to appear in the existing power system, posing a major threat to the safety, stability and operation of the power system. Among them, the power electronic converter with the highest failure rate is a complex system, and many of its physical phenomena have multi-scale characteristics. For example, power electronic equipment in power generation, transmission, and distribution loads have strong nonlinear coupling relationships and complex interaction processes. The observation of its working process in engineering practice is often carried out on different scales. The scale involves from the nanoscale to the kilometer scale, from the picosecond scale t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张波刘运华谢帆丘东元陈艳峰
Owner SOUTH CHINA UNIV OF TECH
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