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Closing control method of high-voltage DC breaker

一种高压直流、控制方法的技术，应用在高压/大电流开关、自动断开的紧急保护装置、用于限制过电流/过电压的紧急保护电路装置等方向，能够解决增加场地和成本等问题，达到避免电压振荡过电压、控制过程简单的效果

Active Publication Date: 2016-12-21
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Connecting resistors in series outside the high-voltage DC circuit breaker and bypass switches in parallel can pre-charge the line to reduce the closing voltage oscillation overvoltage, but additional space and cost are added.

Method used

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  • Closing control method of high-voltage DC breaker
  • Closing control method of high-voltage DC breaker
  • Closing control method of high-voltage DC breaker

Examples

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0026] attached figure 2 Shown is the basic topological structure of a high-voltage DC circuit breaker, including an on-state branch (1) and a breaking branch (2), and the on-state branch (1) and the breaking branch (2) are connected in parallel with each other. The on-state branch includes a series-connected mechanical switch and an on-state valve group, and the mechanical switch can be one switch or a plurality of switches connected in series. The breaking branch circuit includes at least one set of breaking units connected in series, and the breaking units include breaking valve groups and non-linear resistors connected in parallel. attached image 3 Shown is the overvoltage oscillation w...

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PUM

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Abstract

The invention provides a closing control method of a high-voltage DC breaker. Disconnecting valve blocks of a disconnecting branch are closed one by one, an on-state branch is closed, and all the disconnecting valve blocks of the disconnecting branch are disconnected. In the process that the disconnecting valve blocks of the disconnecting branch are closed one by one, whether a fault occurs in a line is detected after that the present disconnecting valve block is closed; if NO, the next disconnecting valve block is closed till all the disconnecting valve blocks are connected; and if YES, all the closed disconnecting valve blocks are disconnected, closing operation is ended, and fault information is reported. Controlled charging of the line can be realized in the DC breaker closing process, and overvoltage generated by closing operation is reduced.

Description

Technical field [0001] The invention relates to a closing control method of a high-voltage DC circuit breaker and belongs to the technical field of circuit breakers. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving the stability of the system, suppressing fluctuations in system frequency and voltage, and improving the steady-state performance of the grid-connected AC system. With the increasing depletion of fossil energy and increasing pressure to improve the environment, China and the world are facing strategic adjustments to the energy structure, and large-scale development and utilization of new energy is imperative. [0003] As flexible DC transmission develops towards higher voltage and larger capacity, flexible DC transmission is applied to overhead line transmission to achieve the objective requirements of optimal allocation of energy re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268H02H3/06H02H3/087H01H33/596H02H7/26H02H9/00H01H9/54H02H1/0007H02H11/00
Inventor 石巍杨兵吕玮王文杰谢晔源方太勋曹冬明
Owner NR ELECTRIC CO LTD
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