Three-level converter, control method and device thereof, storage medium and processor

Abstract

The invention discloses a control method and device of a three-level converter, the three-level converter, a storage medium and a processor. The method comprises the following steps: converting a space vector of the three-level converter from a rectangular coordinate system to a 60-degree coordinate system; under a virtual space vector modulation strategy of the 60-degree coordinate system, dividing sectors of space vectors of the three-level converter again; re-synthesizing the space vector of the three-level converter based on the re-divided sectors; calculating the action time of the re-synthesized adjacent vectors; and distributing the vector action time of the three-level converter according to the calculated action time of the adjacent vectors so as to control a switching tube in the three-level converter and realize neutral-point potential balance control of the three-level converter. According to the scheme, the 60-degree coordinate system is adopted to divide sectors again, vector synthesis is carried out again, neutral-point potential balance under the high modulation degree is achieved, and the output performance of the three-level converter can be improved.

Description

technical field [0001] The invention belongs to the technical field of converters, and in particular relates to a control method and device for a three-level converter, a three-level converter, a storage medium and a processor, in particular to a three-level converter based on two small sectors A control method, device, three-level converter, storage medium and processor. Background technique [0002] Compared with the two-level converter, the multi-level converter has the advantages of less voltage stress on each switch tube and lower harmonic content of the output voltage, so it is used in occasions with higher voltage levels and higher rated power. used widely. Among the multilevel converters, the neutral point clamped (NPC) three-level converter is widely used, but its development is limited by the defect of neutral point potential imbalance. [0003] Among the related schemes, there are mainly two solutions for midpoint potential imbalance, software method and hardwar...

AI Technical Summary

Problems solved by technology

Among the multi-level converters, the neutral point clamped (NPC) three-level converter is widely used, but its development is limited by the defect of neutral point potential imbalance.

[0003] Among the related schemes, there are mainly two solutions for midpoint potential imbalance, software method and hardware method, but the hardware method requires additional hardware investment, which is greatly limited in economic benefits

The most studied method is the software method, which

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