Natural converting type hybrid high-voltage DC circuit breaker

A high-voltage DC, natural commutation technology, used in emergency protection circuit devices for limiting overcurrent/overvoltage, parallel operation of DC power supplies, circuit devices, etc., can solve large overvoltage, large conduction loss, arc extinguishing Difficulties and other problems, to achieve the effect of simple control and high reliability

Inactive Publication Date: 2015-05-13
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Since the current in the DC system does not have a natural zero-crossing point, if the traditional AC circuit breaker is used to break the DC, it is very difficult to extinguish the arc;
[0007] 2. After breaking the DC current, a large

Method used

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  • Natural converting type hybrid high-voltage DC circuit breaker
  • Natural converting type hybrid high-voltage DC circuit breaker
  • Natural converting type hybrid high-voltage DC circuit breaker

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Embodiment Construction

[0035] The natural commutation type hybrid HVDC circuit breaker proposed by the present invention has a structure such as figure 1 As shown, there are a total of n circuit breaker modules in series, and two adjacent modules are connected through an isolating switch; the isolating switch is for the convenience of module connection, module debugging and maintenance. The isolating switch can include conventional vacuum circuit breakers, etc., which are required for series connection. Through modular design and series connection, the number of circuit breaker modules connected in series can be adjusted according to the voltage level of the DC system.

[0036] The single circuit breaker module proposed by the present invention has a structure such as figure 2 shown. It mainly includes three branches of main current branch, main circuit breaker branch, overvoltage limiting and energy absorption branch and measurement control system. Among them, the measurement control system such...

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Abstract

The invention relates to a natural converting type hybrid high-voltage DC circuit breaker, and belongs to the field of DC circuit breakers applied to DC transmission distribution networks. The circuit breaker is formed by connecting a plurality of completely the same high-voltage DC circuit breaker modules in series though a disconnecting switch; each high-voltage DC circuit breaker module is on the basis of the natural converting type hybrid DC circuit breaker; each circuit breaker module comprises a main current branch, a main circuit breaker branch, an overvoltage protecting and energy absorbing branch and a measuring control system; the three branches are interconnected in parallel and are respectively connected with the measuring system; the measuring system controls the working time sequences of the three branches. According to the circuit breaker, active devices such as charging capacitor for assisting zero crossing are saved; the control is simple, the reliability is high, and the demand of domestic DC transmission network and DC distribution network on the DC circuit breaker can be met.

Description

technical field [0001] The invention belongs to the field of DC circuit breakers used in DC transmission and distribution networks, and relates to a natural commutation hybrid DC circuit breaker based on fast mechanical switches and power electronic solid-state switches, mainly considering the coordination of fast mechanical switches and power electronic solid-state switches. It involves the design of the mechanical switch fracture and the design of the power electronic solid-state switch, as well as the principle of the breaking process and the energy absorption process. Background technique [0002] In the face of rapid economic and social development, users have put forward requirements for power systems that are more environmentally friendly, safe and reliable, high-quality and economical, and support two-way interaction between users and the power grid. With the rapid growth of city scale, the continuous development of distributed energy sources, and the increase of pow...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02H7/26H02H9/04H02H9/08
CPCH02H7/268
Inventor 曾嵘余占清吕纲陈政宇朱童张翔宇孙为民庄池杰何金良张波胡军
Owner TSINGHUA UNIV
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