T-shaped three-level converter power module double-pulse testing loop and testing method

Abstract

The invention discloses a T-type three-level converter power module double-pulse test circuit and a test method, comprising: a T-type three-level converter power module; two ends of a DC source connected in parallel with a discharge resistor and a bus capacitor; the bus capacitor It consists of two series-connected DC support capacitors, and the connection of the two series-connected DC support capacitors is connected to one end of two IGBT tubes with different directions; the first DC support capacitor and the two ends of the first DC support capacitor are connected in parallel with the first absorption capacitor and the second absorbing capacitor; a DC source switch is set at the positive end of the DC source, and a discharge branch switch is set at the positive end of the bleeder resistor. The air core inductor is connected to both ends of the first IGBT tube or the fourth IGBT tube. This test method can test various commutation conditions of the power module, device switching time, overvoltage absorption effect of the absorbing circuit and drive short-circuit protection, and provides an effective test method for the development of T-type three-level converters .

Description

【Technical field】 [0001] The invention belongs to the technical field of new energy power generation, and relates to a T-type three-level converter power module double-pulse test circuit and a test method. 【Background technique】 [0002] With the increasingly severe energy crisis and environmental pollution, the use of new energy sources including photovoltaic power generation has attracted more and more attention. The bidirectional AC / DC converter is an important topology in the field of new energy. Compared with the traditional two-level converter, the NPC three-level topology has the advantages of low loss and high efficiency. The T-shaped three-level topology is better than the traditional NPC three-electric The flat topology has the advantages of fewer components and balanced loss distribution. The double-pulse test is an important test link to detect the switching characteristics, drive protection performance and overvoltage absorption performance of the switching dev...

AI Technical Summary

Problems solved by technology

The double-pulse test is an important test link to detect the switching characteristics, drive protection performance and overvoltage absorption performance of the switching device, but the traditional two-level double-pulse test method cannot be directly applied to the T-type three-level converter power module , it is of practical significance to seek a double-pulse test method suitable for T-type three-level converter power modules

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