Three-level laminated busbar for suppressing stray inductance

Abstract

The invention discloses a three-level laminated busbar for suppressing stray inductance. The three-level laminated busbar comprises A, B and C three-phase power modules and a direct-current support capacitor module, power module laminated busbars are arranged on the A, B and C three-phase power module packs, and the power module laminated busbars are respectively connected a direct current positive pole P, a middle electrode O and a negative electrode N; the direct-current support capacitor module comprises a support capacitor laminated busbar, and the direct-current support capacitors are connected in a manner of opposite polarities by taking the vertical center line of the support capacitor laminated busbar as an axis; the support capacitor laminated busbars of the direct-current supportcapacitor module are respectively connected with the direct current positive pole P, the middle electrode O and the negative electrode N; and the direct current sides of the power module laminated busbars are L-shaped design, and are directly attached to and connected with the support capacitor laminated busbars. Through symmetrical design of the path lengths of the positive and negative conversion loops of the power module, the power module is directly connected with the busbars of the direct-current support capacitor module, and the direct-current capacitors are in dispersed polarity placement, so that the stray inductance under three-level four-quadrant operation is reduced, and the overall output capability of the converter is maximized.

Description

technical field [0001] The invention relates to a stacked busbar device for a power electronic system converter, in particular to a three-level stacked busbar capable of suppressing stray inductance. Background technique [0002] In energy storage converters and other similar AC-DC conversion converters, power units and three-level stacked busbars are often used. A reasonable busbar design can suppress the stray inductance of the three-level busbar and improve the voltage and current operating range of the converter. [0003] The current three-level stacked busbars have the following problems: 1. The supporting capacitor and the IGBT module are integrated. It takes time and effort for one person to disassemble and transport, and it is extremely inconvenient to maintain and disassemble. 2. The polarity is not considered when placing capacitors. This leads to high stray inductance of the commutation circuit; 3. There are too many components and the cost is extremely high. ...

AI Technical Summary

Problems solved by technology

[0003] The current three-level stacked busbars have the following problems: 1. The supporting capacitor and the IGBT module are integrated, and it takes time and effort for one person to disassemble and transport, and it is extremely inconvenient to maintain and disassemble; 2. The polarity is not considered when placing capacitors. The stray inductance of the commutation circuit is high; 3. There are too many components and the cost is extremely high

[0004] The existing technology takes into account the optimal design of the three-level busbar and the suppression of stray inductance, but does not address the characteristics of the three-level commutation circuit and symmetrically suppress the problem of stray inductance

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