Water-cooled three-phase diode-clamped three-level inverted power module

Abstract

The invention discloses a water-cooled power module of three-phase diode-clamped three-level inverted topology. The water-cooled power module comprises a support frame, an electrolytic capacitor set, a second laminated bus bar, a water-cooled radiator, a first laminated bus bar, a power device, a balance resistor, a voltage sensor and first absorption capacitor sets, wherein the electrolytic capacitor set is positioned on the support frame; the second laminated bus bar is paved on the electrolytic capacitor set; the water-cooled radiator is spanned above the second laminated bus bar; a first laminated bus bar is spanned above the water-cooled radiator, and corresponding toothed connecting terminals between the first laminated bus bar and the second laminated bus bar are connected through a second absorption capacitor set; the power device, the balance resistor and the voltage sensor are fixed on the upper surface of the water-cooled radiator and are interconnected through the first laminated bus bar; and the first absorption capacitor sets are positioned above the first laminated bus bar and are interconnected through the first laminated bus bar. The water-cooled power module is arranged on the integral water-cooled radiator, so the power density is greatly improved, and the water-cooled power module can be applied to the places which are narrow or closed or have explosion-proof requirements; and the turn-off voltage spike is small, the electrolytic capacitor is difficult to emit heat, and the water-cooled power module is easy to mount and maintain.

Description

technical field [0001] The invention relates to the technical field of high-power three-level AC transmission, in particular to a main circuit structure and layout of a water-cooled power module for a three-phase diode-clamped three-level inverter topology. Background technique [0002] The high-power diode-clamped three-level inverter based on IGBT is one of the medium-voltage AC drive system solutions widely used at present. Now some domestic and foreign enterprises have industrial products of 0.3-7.2MVA. Compared with the cascaded H-bridge topology, it does not have complex multi-winding transformers, and the system reliability is higher, and the single DC bus system enables multiple three-level inverters of different power levels to be supplied by one rectifier can greatly save resources. However, due to the specific needs of different customers, even if the electrical principle of the device is the same, it often needs to be redesigned, especially the system structure,...

AI Technical Summary

Problems solved by technology

Due to its low withstand voltage level, a large number of series and parallel connections are required. The stray inductance on the connection line will cause uneven distribution of high-frequency current among the parallel capacitors, and the capacitors that are closer to the power device will withstand a current higher than the rated value and heat up rapidly.

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