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Arrangement, method and computer program product concerned with tapping of power from DC power line to ac power line

A power transmission and voltage technology, applied in the field of voltage source converters, to achieve stable and balanced three-phase operation and reduce corresponding losses

Active Publication Date: 2016-03-02
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3) It may be necessary to balance the voltage across the introduced capacitor (DC blocking capacitor)

Method used

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  • Arrangement, method and computer program product concerned with tapping of power from DC power line to ac power line
  • Arrangement, method and computer program product concerned with tapping of power from DC power line to ac power line
  • Arrangement, method and computer program product concerned with tapping of power from DC power line to ac power line

Examples

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Embodiment Construction

[0052] Hereinafter, preferred embodiments of the present invention will be described in detail.

[0053] figure 1 A simplified single line diagram of a direct current (DC) power transmission system 10 including a first converter 14 , a second converter 16 and a DC power line 12 is shown. The first converter 14 may here be connected via a transformer 13 to a first AC power line 11 which may be part of a first alternating current (AC) power system in which electricity is generated, and the second converter 16 may be connected via a transformer 17 to A second AC power line 15, which may be part of a second AC power system consuming electricity.

[0054] The DC power line 12 may here be a power line for transmitting electric power and covering long distances. An example distance is a distance of 500 km. It should be appreciated here that the DC power system 10 may alternatively include several more power lines and converters. The system can thus also be a so-called DC grid. H...

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PUM

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Abstract

An arrangement (23) for tapping power from a DC power line (12) to an AC power line comprises power transfer modules (24A, 24B, 24C) between two DC potentials, each comprising a first branch with a string of converter cells (CA1, CA2, CB1, CB2, CC1, CC2) in parallel with a second branch comprising a capacitor (Csa, Csb, Csc) and being connected to an AC phase (22A, 22B, 22C). There is at least one control unit (26A, 26B, 26C) that controls the arrangement considering one or more of a) distributing appropriate AC and DC voltages in converter output voltages of all series connected modules, b) maintaining / setting cell capacitor voltages in specific range and allowing boost mode operation, c) performing possible balancing of the introduced capacitor and. d) employing an alternate approach of using passive filters to mitigate low order harmonics.

Description

technical field [0001] The present invention generally relates to voltage source converters. More particularly, the present invention relates to methods and computers for arrangements for tapping power from DC power lines to AC power lines and for controlling power delivery modules of such arrangements for conversion between AC and DC program product. Background technique [0002] Direct current (DC) power transmission systems are of interest in a variety of applications, such as in transferring power over long distances. High-voltage direct current (HVDC) transmission has proven to be an efficient alternative to alternating current (AC) transmission in many power transmission scenarios. Several HVDC transmission lines can further be interconnected to form an HVDC transmission network. [0003] As is well known, said tap converter taps power from a DC power line to a three-phase alternating current (AC) power line having three phases in series between the DC power line an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/19H02M7/25H02M7/483
CPCH02M7/483H02M1/0074H02M7/4835H02M7/219H02M7/217
Inventor K.H.布哈洛蒂L.哈内福斯S.苏拉马尼安T.乔斯森
Owner HITACHI ENERGY SWITZERLAND AG
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