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Apparatus for transferring electrical power between dc power lines and ac power lines

A technology for transmitting power and power lines, which is applied in the field of voltage source converters to reduce costs and reduce switching losses

Active Publication Date: 2016-09-14
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the number of switching elements provided in this way is rather large and therefore it would make sense to reduce this number

Method used

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  • Apparatus for transferring electrical power between dc power lines and ac power lines
  • Apparatus for transferring electrical power between dc power lines and ac power lines
  • Apparatus for transferring electrical power between dc power lines and ac power lines

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Embodiment Construction

[0024] In the following, a detailed description of preferred embodiments of the present invention will be given.

[0025] figure 1 A simplified single line diagram of a direct current (DC) power transmission system 10 comprising a first converter 14 , a second converter 16 and a DC power line 12 is shown. The first converter 14 is here connectable to a first AC power line, which may be part of a first alternating current (AC) power system (in which power is generated), and the second converter 16 is connectable to a second AC power line, It may be part of a second AC power system (where energy is consumed).

[0026] The DC power line 12 may here be a power line that transfers power over long distances. An exemplary distance is a distance of 500 km. It should be appreciated here that DC power system 10 may alternatively include more than several power lines and converters. The system can thus also be a so-called DC grid. The DC power system is here a unipolar system. Howe...

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PUM

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Abstract

The invention relates to a device (23) for transmitting electric power between a DC power line (12) and an AC power line (22A, 22B, 22C), carrying a voltage having a plurality of phases. The apparatus includes: a plurality of transformers (20A, 20B, 20C), one for each phase; and a plurality of power transfer modules, one for each phase, connected in series between a DC power line and ground, wherein each module includes: A branch comprising series-connected converter cells (CA1, CA2, CB1, CB2, CC1, CC2) and a second branch comprising series-connected switching elements (SW1A, SW2A, SW1B, SW2B, SW3A, SW3B ). The primary windings of the transformers (20A, 20B, 20C) are connected to the corresponding AC phase conductors (22A, 22B, 22C) of the AC power line and the secondary windings are connected between the midpoint of the first leg and the second leg of the corresponding power transfer module. between the midpoints of the road.

Description

technical field [0001] The present invention relates generally to voltage source converters. More specifically, the present invention relates to apparatus for transferring power between DC power lines and AC power lines. Background technique [0002] Direct current (DC) power transmission systems are meaningfully used in various situations, for example when transferring power over long distances. [0003] It is known to transmit power between DC power lines and three-phase alternating current (AC) power lines, where the three phases are connected in series between the DC power line and ground or the negative DC bus. [0004] In eg US 6,519,169 there are multiple series connected power transfer modules between the DC power line and ground, with one such module per AC phase. Each module consists of a two-stage converter and provides an AC phase output at the midpoint of two parallel branches of the module, one of which includes switches with anti-parallel diodes and other ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537H02J3/36H02M7/48H02M7/483
CPCH02J3/36H02M7/483Y02E60/60H02M7/537H02M7/4835
Inventor S.穆克赫杰T.琼森S.苏布拉马尼安
Owner HITACHI ENERGY SWITZERLAND AG