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A Method for Clearing DC Faults in a Current-Shifting Multilevel Converter Topology

A technology for multi-level converters and DC faults, applied in power transmission AC networks, electrical components, emergency protection circuit devices, etc. problem, to achieve the effect of good effect, scientific method and strong applicability

Active Publication Date: 2019-10-11
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

However, due to the disadvantages of high cost, immature technology, and limited ability to break current, DC circuit breakers are rarely used in high-voltage and large-capacity occasions.

Method used

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  • A Method for Clearing DC Faults in a Current-Shifting Multilevel Converter Topology
  • A Method for Clearing DC Faults in a Current-Shifting Multilevel Converter Topology
  • A Method for Clearing DC Faults in a Current-Shifting Multilevel Converter Topology

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Embodiment Construction

[0027] A method for clearing DC faults in a current-shifting multilevel converter topology, such as Figure 1 to Figure 6 As shown, the following steps are included, and the following steps are carried out in sequence,

[0028] Step 1: On the basis of the topology of the half-bridge multilevel converter, add three branches: the current-transferring branch, the energy absorbing branch and the bridge arm transfer branch, and establish a current-transferring modular multilevel converter topology : The current-breaking branch composed of an ultra-fast mechanical switch K and a current-breaking switch T is connected in series at the topological DC outlet of the modular multilevel converter. current converter and DC fault line; set a freewheeling diode D on the side of the DC line c and snubber resistor R c The high-voltage end of the branch is connected to the end of the cut-off branch away from the converter, and the low-voltage end is connected to the DC negative line. When the...

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Abstract

A method for clearing DC faults in a current transfer multilevel convert topology belongs to the field of flexible HVDC technology, based on the topology of half-bridge multilevel converter, A current transfer type modular multilevel converter topology is established by using the energy absorption branch and the bridge arm transfer branch. The converter is quickly disconnected from the fault linethrough the cut-off branch, and then the fault current is absorbed through the bridge arm transfer branch and the energy absorption branch, so that the DC fault can be quickly cleared. The method transfers and clears the DC side short-circuit fault current of the converter through the cooperation of each branch in the current transfer type modular multi-level converter topology, and has good economy and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a topology and method of a current transfer type modular multilevel converter capable of clearing direct current faults. Background technique [0002] Modular multilevel converter (MMC) is a new type of power transmission technology proposed by German scholars R.Marquardt and A.Lesnicar. It adopts the cascading form of sub-modules and has high modularity and harmonic distortion. Since it was proposed in 2002, it has developed rapidly in the field of flexible direct current transmission. However, the half-bridge type MMC commonly used in practical engineering does not have the ability to block the DC fault current. When a bipolar short circuit occurs on the DC side, even if the converter is blocked, the freewheeling diode connected in antiparallel with the IGBT is still connected to the AC current. The system and fault points constitute a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 王振浩刘婕肖壮李国庆辛业春王朝斌
Owner NORTHEAST DIANLI UNIVERSITY
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