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A design method of a DC microgrid and a high and low voltage DC circuit breaker

A technology of DC microgrid and DC circuit breaker, applied in the field of electric power, can solve problems such as lack of DC circuit breakers, and achieve the effects of strong practicability, convenient production and operation, and simple structure

Active Publication Date: 2020-02-14
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DC circuit breaker is an important device in the DC micro-grid system, which plays a key role in fault tripping and protection of power equipment in the system. At present, there is a lack of practical DC circuit breakers.

Method used

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  • A design method of a DC microgrid and a high and low voltage DC circuit breaker
  • A design method of a DC microgrid and a high and low voltage DC circuit breaker
  • A design method of a DC microgrid and a high and low voltage DC circuit breaker

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1 of the present invention: as figure 2 As shown, a high-voltage DC circuit breaker consists of a current-limiting reactor L A 1. Current limiting reactor L B 2. Composed of high-voltage electrical branch 3, IGBT5, diode 6, resistor 7, capacitor 8, zinc oxide arrester 9, fast isolating switch 10, and auxiliary switch 11, in the current-limiting reactor L A 1 with current limiting reactor L B A high-voltage electrical branch 3 is connected in series on the line between 2 to form a DC microgrid. The high-voltage electrical branch 3 includes a first branch, a second branch, a third branch and a fourth branch. The first The branch, the second branch, the third branch and the fourth branch are connected in parallel, and the first branch is connected in series with the fast isolating switch 10 and the auxiliary switch 11; the second branch is composed of at least two auxiliary switches 11 connected in series; each The first auxiliary switch is composed of two I...

Embodiment 2

[0021] Embodiment 2 of the present invention: a low-voltage DC circuit breaker consisting of a current-limiting reactor L A 1. Current limiting reactor L B 2. Low-voltage electrical branch circuit 4, IGBT5, diode 6, resistor 7, capacitor 8, zinc oxide arrester 9, fast isolating switch 10, auxiliary switch 11, in the current limiting reactor L A 1 with current limiting reactor L B A low-voltage electrical branch 4 is connected in series on the line between 2 to form a DC micro-grid. The low-voltage electrical branch 4 includes a first branch, a second branch, a third branch and a fourth branch. The first branch, The second branch, the third branch and the fourth branch are connected in parallel; the first branch is composed of mechanical switches; the second branch consists of at least two IGBT5 modules in series; each IGBT5 module is composed of two IGBT5 units in reverse connected in series, and a diode 6 is connected in antiparallel to each IGBT5 unit; the third branch is ...

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Abstract

The invention discloses a designing method of a direct current micro power grid and a high-low voltage direct current circuit breaker. The method comprises the step of connecting all kinds of loads to corresponding buses through the circuit breaker. The invention also discloses the direct current circuit breaker. For the circuit breaker, a circuit between a current limiting inductor LA (1) and a current limiting inductor LB (2) is serially connected with a high voltage electrical branch (3) or a low voltage electrical branch (4) to form a direct current micro grid. According to the invention, bidirectional rapid turning off can be achieved; structure is simple, manufacturing and operation are convenient and practicability is high; disadvantages in the prior art can be overcome.

Description

technical field [0001] The invention relates to a design method of a power grid and a high and low voltage DC circuit breaker, in particular to a design method of a DC microgrid and a high and low voltage DC circuit breaker, belonging to the technical field of electric power. Background technique [0002] With the continuous development of the economy, due to the depletion of fossil energy and the difficulty of mining, it has also caused serious environmental problems. In recent years, new energy sources such as solar power generation, fuel cells, and wind power generation have been popularized and applied on a large scale. At the same time, a large number of DC loads such as electric vehicles, frequency conversion equipment, LED lighting, and information equipment have appeared. The DC micro-grid, as a more efficient access form of distributed power sources and DC loads, has the advantages of low line loss, large transmission capacity, long transmission distance, high power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/10H02J7/35H02J1/00H02H9/02H02H9/04
CPCH02H9/021H02H9/042H02J1/00H02J1/10H02J7/35Y02E10/76
Inventor 杨艳韩胜国
Owner GUIZHOU POWER GRID CO LTD