High-voltage direct-current breaker topology

A DC circuit breaker, high-voltage DC technology, applied in the direction of circuits, electrical components, electrical switches, etc., can solve the problems of unable to turn off the current, large conduction loss, etc., and achieve the effects of low manufacturing difficulty, high reliability, and low cost

Active Publication Date: 2014-03-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system like the AC system. Therefore, the breaking of the DC current has always been a problem worth studying. Subject
[0007] Moreover, the main circuits of the above two patents must use full-control switching devices in series with mechanical switches, resulting in large conduction losses in normal conditions.

Method used

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  • High-voltage direct-current breaker topology

Examples

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Embodiment 1

[0069] figure 2 Shown is embodiment 1 of the present invention, as figure 2 As shown, the voltage source 15 is a converter station, and the resistor 16 is a simulated short-circuit resistor. The basic topology of the present invention is composed of a first current path 1 and a second current path 2; the first lead-out terminal of the first current path 1 is connected with the first lead-out terminal of the second current path 2 as the first lead-out terminal of the DC circuit breaker It is connected to the DC transmission line 7 near the converter station side, and the second lead-out terminal of the first current path 1 and the second lead-out terminal of the second current path 2 serve as the second lead-out terminal of the DC circuit breaker and the connection between the second lead-out terminal of the far converter station side DC transmission line connection. The inductance L can be the inductance of the converter station itself, or the additional current-limiting i...

Embodiment 2

[0075] image 3 Shown is Example 2 of the present invention. image 3 Voltage limiters are connected in parallel at both ends of the first current path, both ends of the capacitor module of the second current path, and both ends of the cascaded capacitor sub-unit switching module. A voltage limiting device is connected in parallel between the first lead-out terminal of the first current path 1 and the ground, and between the second lead-out terminal of the first current path 1 and the ground, to protect various parts of the entire DC circuit breaker from overvoltage. It is also possible to selectively add voltage limiting devices at both ends of the place where protection is required.

Embodiment 3

[0077] Figure 4 Shown is Example 3 of the present invention. Figure 4 The power electronic switch module 3 in the first current path 1 adopts a semi-controlled device thyristor. The power electronic switch module 3 can also be composed of multiple thyristors connected in series. In this way, the conduction loss of the entire DC circuit breaker is lower when the DC grid is operating normally, but since the thyristor has no self-shutoff capability, it is necessary to create a current zero-crossing point to turn it off. Therefore, in this embodiment, a pre-charging circuit is added at both ends of the capacitor unit C in the second current path, and the charging voltage is negative at the side near the converter station and positive at the side far from the converter station. After the line short-circuit fault is detected, the subunit full-control device groups of the cascaded capacitor subunit switching module 5 of the second current path 2 are turned on, and the capacitor u...

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Abstract

High-voltage direct-current breaker topology is composed of a first current path (1) and a second current path (2). The first current path (1) is formed by connecting at least one electronic power switch module (3) and a mechanical switch (4) in series, and the second current path (2) is formed by a capacitance set (C) and a cascading type capacitance subunit switching module (5). The cascading type capacitance subunit switching module (5) is formed by connecting a plurality of subunits (6) in series. Multiple forming modes exist between the electronic power switch module (3) and the subunits (6) of the cascading type capacitance subunit switching module (5). A first leading-out terminal of the first current path (1) and a first leading-out terminal of the second current path (2) are connected to serve as a first leading-out terminal of a direct-current breaker to be connected with a direct-current transmission line, and a second leading-out terminal of the first current path (1) and a second leading-out terminal of the second current path (2) serve as a second leading-out terminal of the direct-current breaker to be connected with the other end of the direct-current transmission line.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a DC circuit breaker topology. Background technique [0002] Fast DC circuit breaker is one of the key equipment to ensure the stable, safe and reliable operation of DC power transmission and distribution system and DC grid system. Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system like the AC system. Therefore, the breaking of the DC current has always been a problem worth studying. topic. [0003] At present, there are usually two ways to break DC current. The first is a pure power electronic circuit breaker, such as patent CN102870181A, which can turn off power electronic devices with high power and directly break DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the multi-terminal flexible DC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H9/54
Inventor 朱晋韦统振肖立业
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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