Laminated busbar used for diode clamp type three-level converter

Abstract

The invention discloses a laminated busbar used for a diode clamp type three-level converter. The laminated busbar used for the diode clamp type three-level converter comprises a module busbar and a direct current capacitor busbar which are mutually connected. The module busbar is divided into five layers, the first layer comprises an alternating current outlet busbar, a module positive busbar and a module negative busbar; the second layer is an insulation layer; the third later is a module zero busbar; the fourth layer is an insulation layer; and the fifth layer comprises a first module connection busbar and a second module connection busbar. The direct current capacitor busbar is divided into five layers, the first layer is a capacitor positive busbar; the second layer is an insulation layer; the third later is a capacitor zero busbar; the fourth layer is an insulation layer; and the fifth layer is a capacitor negative busbar. The laminated busbar used for the diode clamp type three-level converter can reduce stray inductance of a commutation circuit greatly, turn-off overvoltage of devices can be effectively restrained, a du / dt adsorption circuit is eliminated, and the structure is compact while cost is reduced.

Description

technical field [0001] The invention relates to a laminated busbar, in particular to a laminated busbar for a diode-clamped three-level converter. Background technique [0002] In the case of medium and high voltage electric drives, in order to meet the voltage requirements of the system, it is necessary to use multiple power electronic devices in series, and it is difficult to solve the static and dynamic voltage equalization problems of series power electronic devices, thereby reducing the reliability of the entire system . The diode-clamped three-level topology successfully solves the problem of voltage equalization of switching devices, making it possible to apply low-voltage power electronic devices in medium and high voltage converter systems, so it has been widely used in the field of power electronics , and has broad prospects. [0003] The component layout and laminated busbars of the three-level converter are directly related to the overall performance of the sys...

AI Technical Summary

Problems solved by technology

If the stray inductance of the laminated busbar cannot be effectively reduced, the overvoltage generated in the stray inductance when the device is turned off will cause damage to the IGBT module and cause system failure

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