Fully-controlled hybrid bridge type superconducting current limiter based on power device

Abstract

The invention discloses a fully-controlled hybrid bridge type superconducting current limiter based on a power device. The fully-controlled hybrid bridge type superconducting current limiter comprises a hybrid rectifier bridge and a controller; the hybrid rectifier bridge consists of controllable power switch tubes (K1, K2, K3 and K4) and power diodes (D1, D2, D3 and D4), is provided with a direct-current C end and a direct-current D end, between which a superconducting coil is connected, and has an A end and a B end accessed to a power system; the superconducting coil is arranged in a low-temperature cooling device; when the power system has no load short-circuit fault, the controller is used for controlling K1 and K2 to be switched off and controlling K3 and K4 to be switched on; when the short-circuit fault of the power system is detected and the fault short-circuit current is up to the preset threshold value, the controller controls K1 and K2 to be switched on and K3 and K4 to be switched off. The superconducting current limiter has the advantages of quick response, capability of limiting transient fault current and limiting stable current, simple structure and low cost.

Description

technical field [0001] The invention relates to the field of power devices, in particular to a fully-controlled hybrid bridge-type superconducting current limiter based on power devices. Background technique [0002] At present, bridge-type superconducting current limiters based on power devices mainly include: 1) Basic diode bridge current limiter, the power device on the bridge is a power diode, so the current limiter can only limit the transient current, not the steady state current limiter. 2) The basic thyristor bridge type current limiter, the power device on the bridge is a thyristor, due to the thyristor's own zero-crossing shutdown characteristics, although it can limit the transient and steady state fault current , but a response time of up to 10ms is required after a fault; 3) A dual-coil mutual inductance or switchable bridge current limiter, the DC side of the bridge is a mutual inductance winding composed of two superconducting coils, so the current limiting T...

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Problems solved by technology

[0002] At present, bridge-type superconducting current limiters based on power devices mainly include: 1) Basic diode bridge current limiter, the power device on the bridge is a power diode, so the current limiter can only limit the transient current, not the steady state current limiter. 2) The basic thyristor bridge type current limiter, the power device on the bridge is a thyristor, due to the thyristor's own zero-crossing shutdown characteristics, although it can limit the transient and steady state fault current , but a response time of up to 10ms is required after a fault; 3) A dual-coil mutual inductance or switchable bridge current limiter, the DC side of the bridge is a mutual inductance winding composed of two superconducting coils, so the current limiting Devices are bulky and costly

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