Combined three-level power module and converter

Abstract

The invention provides a combined three-level power module and a converter. In the combined three-level power module, each three-level power unit is respectively arranged on the corresponding radiating surface of the radiator, and for the three-level power unit with the internal double-switch power modules distributed in the shape of the Chinese character 'pin', the combined three-level power module can realize a high output power level, the area, the size and the weight of the required radiator are reduced, namely, the heat dissipation cost required by the radiator is reduced; for the three-level power unit in which the internal double-switch power modules are distributed in a linear shape, the combined three-level module group can realize a high output power level through a direct parallel mode instead of a cabinet combination mode, so that the system cost is reduced while the high output power level is realized; in conclusion, the combined three-level power module provided by the invention can reduce the system cost while realizing a high output power level.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a combined three-level power module and a converter. Background technique [0002] Compared with the traditional two-level topology, multi-level inverters are widely used in high-voltage and high-power fields due to their advantages such as closer output waveforms, less sinusoidal waveform content, weak electromagnetic interference capability, and high efficiency. In order to meet the application requirements of high voltage and high power and reduce the cost of the whole machine, a high voltage and high current dual switch power module (the equivalent circuit of which is as follows: Figure 1a As shown, its structure is as Figure 1b shown) to form a three-level power unit, where the equivalent circuit of the three-level power unit is as follows Figure 7 or Figure 8 The ANPC circuit shown in the figure is then composed of multiple three-level power units in paralle...

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Problems solved by technology

[0003] At present, three common combinations of three-level power modules are as follows: figure 2 , image 3 and Figure 4 shown in figure 2 In the combined three-level power module shown, the dual-switch power modules in each three-level power unit are arranged in a square shape, and a maximum of four three-level power units can be connected in parallel to achieve high output power level, but the overall volume and weight are large, which increases the overall cost; while in image 3 and Figure 4 In the combined three-level power module shown, the dual-switch power modules in each three-level power unit are arranged in a straight line, and limited by the depth of the cabinet, the combined three-level power module can only realize The parallel connection of two three-level power units needs to be realized by combining cabinets in order to further increase the output power, but the combination of cabinets will increase the overall cost of the combined three-level power modules and converters

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