High-voltage DC breaker and control method thereof

A high-voltage DC and circuit breaker technology, which is applied in the control field of high-voltage DC circuit breakers and high-voltage DC circuit breakers, can solve the problem that the breaking time and breaking current capacity cannot meet the requirements of multi-terminal flexible DC transmission systems, and the equipment of DC circuit breakers is expensive and affects the application. and promotion, etc., to achieve the effect of easy pressure equalization, reduction in quantity, and strong flow capacity

Inactive Publication Date: 2016-01-20
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are usually three methods of DC circuit breaker technology. 1) LC resonant DC circuit breaker: on the basis of conventional AC mechanical circuit breakers, by adding auxiliary circuits, superimposed increased oscillating current on the DC current that breaks the arc gap, using Break the circuit when the current crosses zero. The mechanical circuit breaker manufactured by this principle cannot meet the requirements of the multi-terminal flexible DC transmission system in terms of breaking time and breaking current capacity; Breaking power electronic devices directly breaks the DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the multi-terminal flexible DC system in terms of time, the

Method used

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  • High-voltage DC breaker and control method thereof
  • High-voltage DC breaker and control method thereof

Examples

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no. 1 example

[0046] like figure 1 As shown, one set of on-state current branch, current reversing and breaking unit is provided, and the on-state current branch is connected in parallel at both ends of the current reversing and breaking unit. The breaking current branch is only provided with one breaking current module: it includes a non-linear resistor R1 and a full-control device series valve group composed of multiple full-control devices connected in series in the same direction, and the non-linear resistor R1 and the full-control device series valve group groups connected in parallel.

no. 2 example

[0048] like figure 2 As shown, the difference from the first embodiment of the high-voltage DC circuit breaker is that there are multiple sets of current reversing and breaking units, and multiple sets of current reversing and breaking units are connected in series in sequence, and then connected with the on-state current branch connect.

no. 3 example

[0050] like image 3 As shown, the difference from the first embodiment of the high-voltage DC circuit breaker is that: the breaking current branch in the current reversing breaking unit is provided with a plurality of series-connected non-linear resistors R1, and the two ends of each non-linear resistor R1 There is a group of full-control device series valve groups connected in parallel, but the number of full-control devices in the full-control device series valve group in this embodiment is the same as the number of full-control devices in the full-control device series valve group in the first embodiment of the high-voltage DC circuit breaker. The numbers are equal. In this embodiment, the number of full-control devices in each full-control device series valve group is evenly distributed according to the number of groups of full-control device series valve groups. This connection structure can reduce the volume of a single current breaking module.

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PUM

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Abstract

The invention discloses a high-voltage DC breaker and a control method thereof. The high-voltage DC breaker comprises an on-state current branch, a breaking current branch, and a bridge branch. The on-state current branch is formed by a mechanical switch and a current transfer module provided with a fully-controlled device and guarantees low-on-state loss in a normal on state. The breaking current branch is formed by a nonlinear resistor and a fully-controlled device series valve group which are connected in parallel. The bridge branch comprises two bridge arms formed by four same commutation modules. Each commutation module is formed by an uncontrolled device series valve group and an inductor which are connected in series. The bridge branch enables the breaking current branch to be capable of breaking bidirectional bidirectional line current and reduces the number of fully-controlled devices and equipment cost.

Description

technical field [0001] The invention relates to a high-voltage direct current circuit breaker, and also relates to a control method of the high-voltage direct current circuit breaker, which belongs to the technical field of circuit breakers. Background technique [0002] With the development of multi-terminal DC transmission technology, high-voltage DC circuit breakers will become one of the key equipment to ensure the safe and stable operation of the system. 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. [0003] At present, there are usually three methods of DC ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 石巍曹冬明方太勋谢晔源杨兵王宇吕玮刘彬
Owner NR ELECTRIC CO LTD
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