Diode full-bridge dual-stage sub-module for circuit breaker

Abstract

The invention provides a diode full-bridge dual-stage sub-module for a circuit breaker. The diode full-bridge dual-stage sub-module comprises a frame, an IGBT press-fitting structure, a diode press-fitting structure, a voltage equalizing resistor R2, a voltage equalizing resistor R4, a charging capacitor C1 and a charging capacitor C2. The IGBT press-fitting structure and the diode press-fitting structure are fixed to the frame. One end of the diode press-fitting structure is connected to the IGBT press-fitting structure and the other end of the diode press-fitting structure is connected to the charging capacitor C1 and the charging capacitor C2. The diode full-bridge dual-stage sub-module has less semiconductor components, is simple in electrical connection, low in wiring difficulty and low in cost, uses a first laminated busbar, a second laminated busbar, a third laminated busbar and a fourth laminated busbar as electrical connecting lines, is compact in overall structure, is installed as a unit, is uninstalled by using the IGBT press-fitting structure and the diode press-fitting structure as a unit, is easy to install and uninstall, and easy to maintain, As many semiconductor components as possible are press-fitted so as to reduce the overall weight of the sub-modules.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a diode full-bridge dual-stage sub-module used for a circuit breaker. Background technique [0002] The circuit breaker is the core component for breaking the short-circuit current in the flexible direct current transmission system. The circuit breaker is composed of three parallel branches: transfer branch, main branch and energy absorbing branch. The main branch is composed of ultra-high-speed mechanical switches and a small number of full-bridge modules in series; the transfer branch is composed of multi-level diode full-bridge modules in series, which are used to carry and break the fault current of the DC system for a short time; the energy-consuming branch is composed of multiple arrester groups connected in parallel. Used to suppress breaking overvoltage and absorb energy. [0003] When the system breaking signal is received, or the overcurrent protection thres...

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Problems solved by technology

[0007] In order to overcome the disadvantages of large number of semiconductor components, complex electrical connections, difficult wiring and high cost in the above-mentioned prior art, the present invention provides a diode full-bridge two-stage sub-module for a circuit breaker, including a frame, an IGBT press-fit structure, diode pressing structure, voltage equalizing resistor R2, voltage equalizing resistor R4, charging capacitor C1 connected in parallel with voltage equalizing resistor R2, and charging capacitor C2 connected in parallel with voltage equalizing resistor R4; both IGBT pressing structure and diode pressing structure are fixed On the frame, one end of the diode press-fit structure is connected to the IGBT press-fit structure through the first stacked busbar and the second stacked busbar, and the other end is respectively connected to the charging capacitor C1 and the charging capacitor C2 through the third stacked busbar and the fourth stacked busbar , the number of semiconductor components is relatively small, the electrical connection is simple, the wiring is difficult and the cost is low

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