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Converter with active fault current limitation

A voltage source converter, converter technology, applied in the direction of converting AC power input to DC power output, power transmission AC network, emergency protection circuit device for limiting overcurrent/overvoltage, etc., can solve the problem of unavailability, power problems such as prolonged flow interruption, to achieve the effect of reducing the total cost and reducing the size of the converter

Inactive Publication Date: 2012-07-04
ALSTOM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in prolonged interruptions in power flow and, consequently, the unavailability of the transmission scheme to facilities dependent on it

Method used

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  • Converter with active fault current limitation
  • Converter with active fault current limitation
  • Converter with active fault current limitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] The voltage source converter 20 according to the embodiment of the present invention is Figure 2a and 2b is shown as being connected in the HVDC grid between the DC network 22 and the AC network 24 in order to interconnect the DC and AC networks 22 , 24 . The voltage source converter 20 includes a converter unit 26 that converts power flowing between a DC network 22 and an AC network 24 , and a fault unit 28 .

[0049] The fault unit 28 comprises a plurality of fault modules 30 connected in series forming a chain-link converter 32 connected between the DC and AC networks 22 , 24 with the converter unit 26 , each fault module comprising a voltage source 34 .

[0050] In operation of the HVDC transmission grid, the DC network 22 may experience DC side faults manifested as a short circuit across the DC transmission line or cable, which may be less than a few ohms. During such a fault condition, the voltage source converter 20 remains connected to another non-faulty AC n...

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PUM

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Abstract

A voltage source converter (20) for high voltage DC power transmission that is connectable, in use, between a DC network (22) and another electrical network (24) to interconnect the DC network (22) and the other electrical network (24). The voltage source converter (20) comprises a converter unit (26) to convert power flowing between the DC network (22) and the other electrical network (24) and at least one fault unit (28). The or each fault unit (28) includes at least one fault module (30) having a voltage source (36) that is operable, in the event of a short circuit in a DC network (22) connected to the voltage source converter (20), to produce a voltage that acts to reduce current flowing through the voltage source converter (20) and the short circuit.

Description

technical field [0001] The present invention relates to a voltage source converter for high voltage direct current (HVDC) power transmission. Background technique [0002] In an HVDC transmission network, alternating current (AC) power is usually transformed into direct current (DC) power for transmission via overhead lines and / or submarine cables. This transformation means that the effect of AC capacitive loading imposed by the transmission line or cable does not have to be compensated. This thus reduces the cost per kilometer of wire and / or cable, and thus makes the conversion of AC power to DC power cost-effective when power needs to be transmitted over long distances. [0003] Conversion of AC power to DC power is also commonly used in transmission grids where it is necessary to interconnect two AC networks operating at different frequencies. [0004] Every interface between AC and DC networks requires a converter to effect the required conversion between AC and DC pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M1/32
CPCH02J3/1857H02J3/36H02M1/32H02M7/797Y02E60/60Y02E40/26H02M2007/4835Y02E40/20H02M7/4835H02M1/0095H02H7/12H02H9/02H02J2003/365
Inventor 戴维·特莱纳科林·唐纳德·默里·奥特斯科林·查诺克·戴维森罗伯特·怀特豪斯
Owner ALSTOM TECH LTD
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