Mesh combination method for acquiring sneak circuits in power electronic converter

Abstract

The invention provides a mesh combination method for acquiring sneak circuits in power electronic converters. Circuit topography of a power electronic converter is regarded as being composed of a plurality of independent meshes, the meshes are subjected to combination operation to obtain all sub-circuits in the converter, the sub-circuits invalid are eliminated according to the basic principle of circuit and the operating principle of power electronic converters, the sub-circuits remaining are in valid operating modes, the valid operating modes are combined to obtain all operating modes according to on and off rules of switch elements in the converter, and the sub-circuit in the mode different from the normal operating nodes is regarded as a sneak circuit, and accordingly the potential circuit in the power electronic converter is obtained. The method has the advantages that the analysis process of sneak circuit is simplified, analysis results are more complete, and no sneak circuit is missed; the method is applicable to the search of sneak circuits in various power electronic converters.

Description

technical field [0001] The invention belongs to the fields of reliability analysis and safety diagnosis, and relates to a mesh combination method for obtaining potential circuit phenomena of power electronic converters. Background technique [0002] Latent circuit phenomenon is a latent phenomenon in electrical and electronic systems. Under normal circumstances, this phenomenon will not appear. When the excitation conditions are met, the latent circuit phenomenon will appear. The appearance of latent circuit phenomena will inhibit the desired function of electrical and electronic systems, or introduce undesired functions, seriously affecting the safety and reliability of system operation. Studying the analysis method of potential circuit phenomenon can obtain the potential circuit phenomenon in the system in advance, so as to take reasonable measures to prevent the occurrence of this phenomenon, and effectively improve the safety and reliability of the system. The power ele...

AI Technical Summary

Problems solved by technology

However, the generalized connection matrix method can only obtain the potential circuit path, while the power electronic converter takes the working mode as the minimum working unit, so it is necessary to try to combine the working mode of the converter and the potential circuit path on the basis of the potential circuit path. The phenomenon analysis steps are complicated and the workload is large; although the switching Boolean matrix method can directly analyze and obtain the working mode, only the on-off characteristics of the switching element are considered in the analysis process, and it is easy to miss the special characteristics of the energy storage element after the energy is released. situation, resulting in incomplete analysis results of potential circuit phenomena

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