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Improved topology of multi-pulse AC/DC converter in HVDC and VFD systems and realization method thereof

A DC converter, multi-pulse technology, applied in the field of multi-pulse AC/DC converters

Active Publication Date: 2017-07-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the use of filtering devices in high power systems may involve the risk of electrical resonance with the AC system (e.g. grid, AC motors)

Method used

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  • Improved topology of multi-pulse AC/DC converter in HVDC and VFD systems and realization method thereof
  • Improved topology of multi-pulse AC/DC converter in HVDC and VFD systems and realization method thereof
  • Improved topology of multi-pulse AC/DC converter in HVDC and VFD systems and realization method thereof

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Such as Figures 1 to 13 As shown, this embodiment provides an improved topology of a multi-pulse AC / DC converter in HVDC and VFD systems and its implementation method.

[0041] in, figure 1 It is a structural schematic diagram of four separated three-phase variable phase-shifting transformers in this embodiment, specifically including four separated three-phase transformers, four series-connected six-pulse rectifier modules, and the secondary of the four separated three-phase transformers respectively connected to the four six-pulse rectifier modules; the primary and secondary windings of the three-phase transformer are configured in a Z shape, and the tap-changing windings are controlled by power semiconductor devices to obtain variable phase shift angles and turns ratios .

[0042] In this embodiment, for the three-phase transformer, Z-sha...

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Abstract

The invention relates to an improved topology of a multi-pulse AC / DC converter in HVDC and VFD systems and a realization method thereof. The structure of the improved topology comprises four separated three-phase transformers and four serially-connected six-pulse rectifier modules, and the secondary of the four separated three-phase transformers are connected to the four serially-connected six-pulse rectifier modules. The primary and secondary windings of the three-phase transformers are configured in a Z-shaped manner, and a power semiconductor device is used for controlling tap-change windings to further obtain the variable phase shifting angle and the turn ratio. The structure is simple, and the reconfiguration can be carried out at the corresponding closest number of pulses.

Description

technical field [0001] The invention relates to the technical field of multi-pulse AC / DC converters, in particular to an improved topology of multi-pulse AC / DC converters in HVDC and VFD systems and an implementation method thereof. Background technique [0002] Today, the reliability, availability and maintainability of high voltage direct current transmission (HVDC) and variable frequency drive (VFD) systems are key criteria for effectively securing global power generation needs. In these systems, load commutator converter technology (LCC) for ultra-high power AC / DC and DC / AC conversion not only provides pulsating DC or AC power, but also provides an efficient and high power quality interface to the AC system ( e.g. grid, motor). [0003] a) Conventional Multi-Pulse AC / DC This rectifier is the earliest and best known technology in the industry for HVDC and VFD systems. It is efficient and reliable, and its architecture allows it to operate continuously even under faulty ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/155H02M1/32
CPCH02M1/32H02M7/155H02M1/007H02M1/325
Inventor 金涛宗戈苏见燊鲁道夫·凯撒·科斯塔·弗莱施
Owner FUZHOU UNIV