Direct current side series connection and alternating current side parallel connection type electric energy tapping device

A DC-side and AC-side technology, applied in the field of power conversion device topology for high-voltage direct current transmission channels, can solve the problems of limited voltage level of parallel-connected tapping devices and difficulty in realizing bidirectional power flow, and reduce construction costs and Effect of operating voltage

Inactive Publication Date: 2021-06-08
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a DC-side series AC-side parallel-connected electric energy tapping device, which solves the problem that the series-type tap-changing device in the prior art is difficult to realize the bidirectional flow of power and the parallel-connected tap-changing device To solve the problem of limited voltage level, improve the efficiency and flexibility of HVDC power tapping

Method used

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  • Direct current side series connection and alternating current side parallel connection type electric energy tapping device
  • Direct current side series connection and alternating current side parallel connection type electric energy tapping device
  • Direct current side series connection and alternating current side parallel connection type electric energy tapping device

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specific Embodiment approach 1

[0048] Specific implementation mode one: in figure 1 shows a main circuit of a DC-side series AC-side parallel-connected power tap device, including: 3 bridge-type single-phase DC / AC bidirectional converters (4, 5, 6), 3 single-phase transformers (7 , 8, 9). Three bridge-type single-phase DC / AC bidirectional converters are connected in series and connected to the DC busbars (1, 2) in parallel; the AC output terminals of the basic converter unit are connected to the input terminals of the single-phase transformer in one-to-one correspondence; the The output end of the single-phase transformer is connected to the three-phase ports A, B, and C of the AC network (3).

[0049] In the first specific embodiment, a DC-side series and AC-side parallel type electric energy tapping device is figure 2 The form shown is connected to an external circuit, and the left / right bridge arms are both composed of submodule bridge arms (4-1, 4-2, 4-3, 4-4). Among them, the DC sides of the three ...

specific Embodiment approach 2

[0054] Specific implementation mode two: refer to Figure 6 This embodiment is described in detail. This embodiment is a further description of the specific embodiment-a DC side series AC side parallel type power tap device. In this embodiment, the three bridge-type single-phase DC / AC bidirectional converters The right bridge arms are all capacitive bridge arms (4-10, 4-11). Compared with the first embodiment, half of the sub-modules are omitted in the second embodiment, which can save costs. In the second specific implementation mode, the voltage modulation strategy of the bridge type single-phase DC / AC bidirectional converter is as follows: Figure 7 As shown, since the right bridge arm is two capacitors connected in series, the midpoint potential u of the right bridge arm bn is close to 0v, so it is only necessary to control u according to the traditional dq decoupling control method an To control, the converter can be controlled to output AC voltage u ab .

[0055] The...

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Abstract

The invention discloses a direct current side series connection and alternating current side parallel connection type electric energy tapping device, and belongs to the field of power conversion device topology for high-voltage direct current transmission channels. The device comprises three bridge type single-phase direct current / alternating current bidirectional converters and three independent single-phase transformers, the three bridge type single-phase direct current / alternating current bidirectional converters are of full-bridge structures or half-bridge structures, the direct current sides of the three bridge type single-phase direct current / alternating current bidirectional converters are connected in series; the load sides of the single-phase transformers can be in triangular connection or Y-shaped connection to form three-phase alternating current power supply; the alternating current network is an active load network containing an alternating current power supply, and the alternating current network is a passive load network; the direct current / alternating current bidirectional conversion device is suitable for a traditional LCC-HVDC system, a voltage source type VSC-HVDC system, a hybrid LCC / VSC-HVDC system and a two-end and multi-end HVDC system. The problems that in the prior art, a series connection type tapping device is difficult to achieve two-way circulation of power, and a parallel connection type tapping device is limited in voltage class are solved, and the efficiency and flexibility of HVDC power tapping are improved.

Description

technical field [0001] The invention relates to the topology field of a power conversion device for a high-voltage direct current transmission channel, and more specifically relates to a DC-side series-connected AC-side parallel type electric energy tapping device. Background technique [0002] High-voltage direct current transmission (HVDC) has the advantages of low cost, high efficiency and controllable power flow in long-distance and large-capacity power transmission occasions. Different from high-voltage AC transmission, HVDC is still an end-to-end transmission, and power cannot be tapped midway, which limits the flexibility of power distribution and the efficient use of fixed assets. As a small-capacity converter, the HVDC power tap provides a new idea to solve this problem. [0003] Based on power electronics technology, patent US5187651 and patent WO9515605 respectively proposed two kinds of power tap devices that connect the DC side in series to a single LCC-HVDC tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/68
CPCH02M7/68
Inventor 肖华锋王梓懿
Owner SOUTHEAST UNIV
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