Power device capable of resisting short-circuit fault and suppressing explosion

Abstract

The invention discloses a short-circuit-fault-resistant and explosion-suppression power device, and belongs to the technical field of power electronic devices. The power device comprises a direct current anode power terminal, a direct current cathode power terminal, two alternating current power terminals and a plurality of power semiconductor chips. The first commutation loop and the second commutation loop in the power device are decoupled in the device, so that a short-circuit fault current path comprises two alternating-current power terminals, the inductance of the short-circuit loop is increased, and the rise rate and the amplitude of the short-circuit current are inhibited. A fuse or a thermosensitive element is connected to the alternating-current power terminal, so that suppression of the rise rate and the amplitude of the short-circuit current is further realized. The configuration design does not affect the normal operation of the power device, can realize the collaborative optimization of the commutation loop inductance and the short-circuit endurance capability of the power device, and has the functions of autonomously suppressing the short-circuit fault current and preventing the device from explosion.

Description

technical field [0001] The invention belongs to the technical field of power electronic devices, and in particular relates to a power device capable of resisting short-circuit faults and suppressing explosions. Background technique [0002] Electromagnetic energy conversion devices are large-scale core equipment for resource exploration and development. They need to face extreme environments such as high temperature, high humidity, and high altitude, as well as extreme working conditions of high current density, high temperature shock, and strong magnetic field pulses. The power device is the core component in the electromagnetic energy conversion device, and it is also the device with the highest failure rate. Taking the Modular Multi-level Converter (MMC) used in the field of flexible DC transmission as an example, a 3.3kV / 2400A high-voltage and high-power device is used. When the short-circuit fault current can reach tens to hundreds of times of the rated current of the ...

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Problems solved by technology

[0010] To sum up, in the existing power device configuration, there is a trade-off relationship between "reducing voltage overshoot" and "improving short-circuit withstand capacity", while the current optimal design method only considers reducing the inductance of the commutation loop, Neglecting the degradation of its short-circuit fault withstand capability

At the same time, even if the dual AC power terminal design is adopted, it is only to improve the current carrying capacity of the AC power terminal of the power device

None of the above optimization design methods can achieve the function of resisting short-circuit faults and suppressing overcurrent explosion of power devices

In addition, in the scheme of preventing the explosion of the traditional power device configuration by connecting the fuse in series, since the fuse can only be connected to the DC power terminal, an additional inductance will be introduced in the commutation circuit, which further increases the active power device shutdown. Voltage overshoot and turn-off loss between collector and emitter during off-time

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