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Fault self-cleaning MMC topology suitable for DC power grid

A DC power grid, self-clearing technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices for limiting overcurrent/overvoltage, etc., can solve the problems of slow shutdown, high cost, low voltage level, etc. The effect of small turn-off delay, improved utilization, and reduced operating loss

Inactive Publication Date: 2019-07-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of the current high-voltage DC circuit breaker, such as low voltage level, slow shutdown and high cost

Method used

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  • Fault self-cleaning MMC topology suitable for DC power grid
  • Fault self-cleaning MMC topology suitable for DC power grid
  • Fault self-cleaning MMC topology suitable for DC power grid

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Embodiment Construction

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0017] A fault self-clearing MMC topology suitable for DC grids such as figure 1 As shown, it includes a converter unit and a circuit breaker unit, wherein the line unit is composed of a fast mechanical switch, a capacitor, and a diode, and the diode unit is composed of a number of diodes connected in series, the number of which depends on the DC voltage; Figure II The topological structure of the converter is further demonstrated. Several reverse-series IGBT switch groups are connected in parallel between the upper and lower bridge arm inductors of the traditional converter station, and metal oxide arresters are also connected in parallel.

[0018] fault clearing principle such as image 3 As shown, when a fault occurs, by blocking all sub-modules, the T in the ICM is tri...

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Abstract

The invention relates to a fault self-cleaning MMC topology suitable for a DC power grid, and belongs to the technical field of multi-terminal DC and DC power grids. The fault self-cleaning MMC topology contains a converter unit and a line unit, wherein the converter unit is composed of a converter station with an improved structure, and the line unit is formed by parallel connecting an isolatingswitch, a capacitor and a plurality of diodes connected in series. During normal operation of the fault self-clearing MMC topology, the converter unit thereof operates as a converter station, which isthe same as the normal working state; since the line unit is not connected to the line, the normal operation of the system will not be affected; and the synchronous control of the converter unit andline unit during faults achieves fault clearing and isolation.

Description

technical field [0001] The invention relates to a fault self-clearing MMC topology suitable for direct current power grids, belonging to the field of multi-terminal direct current and direct current power grids. Background technique [0002] Due to many advantages, flexible DC transmission has been paid more and more attention, and multi-terminal DC transmission and DC grid have become the future trend. However, since the fault current of the DC line fault does not have a zero-crossing point, it cannot use the zero-crossing point to extinguish the arc like the AC transmission, which brings great difficulties to the realization of the DC circuit breaker. The current implementation methods are divided into the following types: Based on The superimposed oscillating current generates the current zero-crossing point, and then realizes the current breaking. The disadvantage is that the turn-off delay is too long and the turn-off current is limited; the DC line increases the invert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H9/02H02H3/06
CPCH02H3/06H02H7/268H02H9/02H02H7/1222H02H7/1257H02H7/26
Inventor 赵成勇俞永杰李嘉龙李帅贾秀芳许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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