Model-based design device and method for double closed-loop three-level inverter system

Abstract

The invention relates to a model-based design device and method for a double closed-loop three-level inverter system, in particular to a level inverter system device and a design method of the level inverter system device. The device and method aim to solve the problems that existing three-level inverter systems are simple in control structure and low in conversion efficiency; according to development methods of the existing three-level inverter systems, the development period is long, time and labor are wasted during debugging and verifying, errors which cannot be modified can even occur possibly in serious cases, and consequently system development fails. A control system model is established by taking MATLAB software as a design platform, the system model comprises a frequency conversion model and an interrupt sub-model, the frequency conversion model comprises an A / D conversion frequency collection model and a frequency modulation model, and the interrupt sub-model comprises an A / D conversion voltage collection model, a voltage regulation model, a midpoint potential control model and a duty ratio calculation model. According to the model-based design device and method for the double closed-loop three-level inverter system, the development period is shortened, development cost is lowered, work reliability is improved, and constant modification and verification of the models are supported, so that system optimization and debugging are facilitated.

Description

technical field [0001] The invention relates to a level inverter system and a design device and method thereof, in particular to a model-based design device and method for a double-closed-loop three-level inverter system, belonging to the technical field of power electronics. Background technique [0002] Compared with the traditional two-level inverter, the multi-level inverter has many advantages such as low switching frequency, cost saving, low harmonic content, and small electromagnetic interference. more and more widely used. Three-level inverter is one of the earliest researches and applications in multi-level systems. Because of its relatively mature technology, it has been widely used. However, due to the complex topology of multi-level, if the number of levels increases, the number of switch tubes will also double, resulting in a large circuit and complex control algorithms. Therefore, embedded system development is used as the mainstream multi-level inverter. sys...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing three-level inverter system has a single control structure and low conversion efficiency. The development method of the existing level inverter system has a long development cycle, low efficiency of manual programming, and many errors. The link is basically carried out in isolation, there is no continuity, the test is repetitive, the error checking and verification are time-consuming and labor-intensive, the cost of later correction is high, and serious errors may even occur that cannot be corrected, leading to the failure of system development

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