All-solid-state DC breaker and control method thereof

A technology of DC circuit breaker and control method, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device, etc. for limiting overcurrent/overvoltage, and can solve the problem of high loss and cost, and control consistency of full control devices The requirements are also relatively high, and the on-state loss is small, the control complexity is simplified, and the control is simple.

Active Publication Date: 2015-09-09
RONGXIN HUIKO ELECTRIC TECH CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Ordinary all-solid-state DC circuit breakers require multiple fully-controlled power devices to be directly connected in ...

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  • All-solid-state DC breaker and control method thereof
  • All-solid-state DC breaker and control method thereof
  • All-solid-state DC breaker and control method thereof

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Embodiment Construction

[0037] Below in conjunction with the accompanying drawings, the specific implementation of the patent of the present invention will be further described in detail. The patent of the invention belongs to the application category of power electronics and is applied to a multi-terminal DC transmission system. The DC circuit breaker is connected in series to the transmission system, and is used to cut off the short-circuit current of the system and clear the fault in the system short-circuit fault mode.

[0038] See figure 1 , figure 2 , The all-solid-state DC circuit breaker is composed of a long-term current flow branch, a current breaking branch, and an energy absorption branch connected in parallel. Among them, the long-term flow branch bears the load current during the normal operation of the system, the full-bridge rectification structure ensures the bidirectional flow of the system, the semi-controlled switching device has high withstand voltage, large flow capacity, and ...

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Abstract

The invention discloses an all-solid-state DC breaker and a control method thereof. The all-solid-state DC breaker, including a long-term flow passage branch, a current cut-off branch and an energy absorption branch that are connected in series, is characterized in that the long-term flow passage branch includes at least one half-control device and at least one full-control device that are in series connection, and a full-bridge circuit is adopted to achieve bidirectional flow passages; the current cut-off branch is formed by a circuit break unit including a full-control device, an RCD absorption circuit and a lightning arrester that are connected in series, and a full-bridge circuit is adopted to achieve bidirectional flow passages; and the energy absorption branch includes at least one lightning arrester. The all-solid-state DC breaker is simple and novel in topological structure and low in on-state loss, the number of full-control devices is reduced, and the control complexity and costs are reduced. Faulty currents can be removed quickly. The faulty currents are prevented from increasing through separate control of cut-off units, so the breaker effectively copes with short circuit and overload faults in a DC system while having a current limiting function. The DC system can be protected and runs safely.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a topology of an all-solid-state DC circuit breaker and a control method thereof. Background technique [0002] With the development of DC transmission and distribution technology, traditional DC transmission and light DC transmission technology have become an important direction for the future development of power grids. In the multi-terminal DC transmission system, as a fault protection device, the DC circuit breaker has become one of the important devices for the safe operation of the system. When the DC circuit breaker cuts off the fault current, there is no current zero crossing point. Therefore, the development of DC circuit breakers is facing more difficulties. [0003] In order to solve the arc problem in the process of breaking the current, the DC circuit breaker composed of mechanical switches needs to add an auxiliary oscillating circuit to crea...

Claims

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Application Information

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IPC IPC(8): H02H3/087H02H9/04
Inventor 刘伟余琼张海涛易荣赵明宇刘国伟姚森敬
Owner RONGXIN HUIKO ELECTRIC TECH CO LTD
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