Same-frequency coupling injection type direct current circuit breaker and control method thereof

A technology of DC circuit breaker and control method, which is applied in the direction of DC network circuit device, circuit, circuit device, etc., and can solve the problem that the circuit breaker is difficult to adapt to the increase of voltage level

Pending Publication Date: 2022-02-15
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the circuit breaker in the prior art is difficult to adapt to the voltage level increase, thereby providing a co-frequency coupling injection type DC circuit breaker and its control method

Method used

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  • Same-frequency coupling injection type direct current circuit breaker and control method thereof
  • Same-frequency coupling injection type direct current circuit breaker and control method thereof
  • Same-frequency coupling injection type direct current circuit breaker and control method thereof

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Embodiment Construction

[0038] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention provides a same-frequency coupling injection type direct current circuit breaker and a control method thereof. The circuit breaker comprises a through-flow branch, an energy consumption branch and an on-off branch, wherein the through-flow branch is connected in series in a power line; the on-off branch is connected with the through-flow branch in parallel, the on-off branch comprises a capacitor unit and a same-frequency coupling injection unit, and the capacitor unit is connected with the same-frequency coupling injection unit in series; the energy consumption branch is connected with the capacitor unit in parallel; as the voltage grade of the same-frequency coupling injection unit is far lower than the rated voltage grade of the direct current circuit breaker, the design difficulty and insulation cost in a high-voltage system are reduced by introducing the same-frequency coupling injection unit, the capacity of the high-voltage system is not limited any more, the flexibility and reliability of the circuit breaker are further improved, and the circuit breaker adapts to the high-voltage-grade electric power environment.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a co-frequency coupling injection type DC circuit breaker and a control method thereof. Background technique [0002] Today's DC power transmission and distribution technology has become an effective means of large-scale transmission and consumption of renewable energy such as wind and solar energy, and high-voltage DC circuit breakers are key equipment for the development of DC power transmission and distribution to a more economical and flexible network. The hybrid connection of mechanical switches and power electronic devices has the characteristics of low mechanical loss and high-speed switching of power electronics. It is the mainstream technical route in the field of high-voltage DC circuit breakers at present. However, the application of large-scale power electronic devices in hybrid DC circuit breakers results in high costs, and its breaking capacity is limited ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H01H9/54H02J1/00H02J3/36
CPCH02H7/268H01H9/54H02J1/00H02J3/36Y02E60/60
Inventor 李弸智高冲孙泽来陈龙龙王新颖
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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