Two-way line current breaking device and control method thereof

A bidirectional current and line technology, applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices, etc., can solve the problems of increased difficulty in device layout, installation and wiring, and power semiconductor device damage consistency. Achieve low on-state loss and low total loss

Active Publication Date: 2014-08-06
NR ELECTRIC CO LTD +1
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Problems solved by technology

The increase of power semiconductor devices in the second current direction destroys the consistency of t

Method used

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  • Two-way line current breaking device and control method thereof
  • Two-way line current breaking device and control method thereof
  • Two-way line current breaking device and control method thereof

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Experimental program
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specific Embodiment approach

[0073] The design device 20 can break the bidirectional current of the ±400kV high-voltage direct current transmission line, and the current breaking capacity is 2kA.

[0074] like figure 1 As shown, the device 20 for breaking the bidirectional current of the line includes: breaking current branch 9, current commutation branch A, B, C, D and on-state current branch 30: wherein, breaking current branch 9 should be able to bear at least For a breaking voltage of 800kV, consider a certain margin. According to the design of breaking 1200kV, two 4.5kV / 1.6kA IGBTs are connected in parallel as a unit device. Considering the voltage unevenness that may occur at the moment of turning off, the withstand voltage design of the device must be With a certain margin, a total of 400 unit devices are required to be connected in series to form an IGBT valve group, and the total number of devices is 800. All IGBTs are arranged in the same direction.

[0075] The on-state current branch 30 incl...

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Abstract

An apparatus for breaking a line bidirectional current and a control method therefor. The apparatus comprises a breaking current branch circuit (9) and an on-state current branch circuit (30), wherein the breaking current branch circuit (9) comprises one nonlinear resistor (13) being connected in parallel to one first power semiconductor device (5), or one nonlinear resistor (13) being connected in parallel to at least two first power semiconductor devices (5) mutually connected in series; and the on-state current branch circuit (30) comprises at least one bidirectional power semiconductor switch (12) being connected in series to at least one high-speed isolation switch (11). The apparatus also comprises a bridge-type branch circuit, wherein the bridge-type branch circuit comprises two bridge arms constituted by four identical current commutation branch circuits. The apparatus can break a bidirectional current.

Description

technical field [0001] The invention relates to a device for breaking bidirectional current flowing through a line, and a control method for the device. Background technique [0002] In the multi-terminal direct current transmission system, the high voltage direct current circuit breaker is one of the crucial equipments. Due to the high voltage level and small line impedance of the multi-terminal HVDC transmission system, once a line short-circuit fault occurs, it will quickly affect the DC transmission network and the AC network, and the fault must be removed quickly. Therefore, the high-voltage DC circuit breaker needs to operate quickly, which can minimize the fault duration or suppress the fault current, and reduce the impact of the fault on the AC / DC transmission network. Since the high-voltage DC circuit breaker is connected in series with the transmission line, in addition to requiring the circuit breaker to have a higher circuit breaking speed, the circuit breaker i...

Claims

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Application Information

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IPC IPC(8): H02H3/087
CPCH01H33/00H01H9/542H01H9/548H01H33/596H02H3/087H02H3/021H02H3/08
Inventor 曹冬明方太勋王宇杨浩杨兵石巍吕玮
Owner NR ELECTRIC CO LTD
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