Flexible direct-current power module with multi-level explosion-proof and protective structure

Abstract

The invention provides a flexible direct-current power module with multi-level explosion-proof and protection functions. The flexible direct-current power module comprises a power device crimping assembly, a direct-current busbar assembly, a water pipe assembly and a power module shell assembly. A busbar fixing plate is arranged in the middle of the direct-current busbar assembly; round metal gaskets are arranged on the two sides of the direct-current busbar assembly, the direct-current busbar assembly is fixed through high-strength bolts, and it is ensured that when the direct-current busbarassembly and an electrical connection part bear large electric power, destructive consequences such as breakage, breaking and arc discharge cannot happen to the direct-current busbar assembly and theconnection part. The axial buffering effect of a belleville spring in a power device crimping assembly on a guide sleeve can prevent hard impact from damaging mechanical parts in the crimping assemblyunder extreme conditions, and after an extreme fault occurs, the power device in the crimping assembly can continuously and stably flow through. The water pipe assembly is protected against damage ofmachinery and electric arcs to a great extent through multi-level protection measures of the water pipe assembly.

Description

technical field [0001] The invention relates to the technical field of data transmission of flexible direct current transmission converter valves, in particular to a flexible direct current power module with multi-level explosion-proof and protective structures. Background technique [0002] The power module is the core unit of the flexible DC converter valve. The power devices in the converter valve are concentrated inside the power module. The flexible DC power module has a large current and a large capacitor value, so the power density and energy density are high. When the power module has an extreme fault condition such as a direct short circuit, the capacitor discharges electricity to the power device and the DC bus in the short circuit, and the extreme discharge current will cause local energy concentration and rapid release of the power device in the crimping assembly, resulting in The cracking of the ceramic shell, the transient impact stress of the cracked ceramic s...

AI Technical Summary

Problems solved by technology

When the power module has an extreme fault condition such as a direct short circuit, the capacitor discharges electricity to the power device and the DC bus in the short circuit, and the extreme discharge current will cause local energy concentration and rapid release of the power device in the crimping assembly, resulting in The cracking of the ceramic shell, the transient impact stress of the cracked ceramic shell fragments may cause the water pipe in the power module to break

The extreme discharge current will also generate a huge electromotive force between the positive and negative DC bus bars, causing unpredictable deformation of the DC bus bars. Damage to the DC busbar, or even the arc will fuse the water pipe and cause water leakage in the power module. Once the water pipe leaks, the converter valve will stop operating, which is very harmful

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