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Multiport back-to-back DC-DC converter

A DC converter and multi-port technology, applied in the direction of converting DC power input to DC power output, parallel operation of DC power supplies, instruments, etc., can solve problems such as lack of isolation of DC faults, stability problems, and inconvenient expansion, and achieve Improve the safety and stability of operation, save costs, and improve the effect of safety

Inactive Publication Date: 2014-09-03
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem with this solution is that it is inconvenient to expand. If a new port is connected to the multi-port DC-DC converter, the entire multi-port DC-DC converter needs to be shut down and the internal multi-port AC transformer needs to be modified. Shutdown of the entire multiport DC-DC converter is unacceptable in a large-scale DC grid and can lead to severe power loss and thus stability problems
At the same time, this solution does not have the ability to isolate DC faults

Method used

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  • Multiport back-to-back DC-DC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as Figure 7 The shown four-port back-to-back DC-DC converter includes a first DC system 21, a second DC system 22, a third DC system 23, a fourth DC system 24, a first converter 1, and a second converter 2 , the third converter 3, the fourth converter 4, the AC transformer 11, the AC circuit breaker 13, the phase reactance 12 and the public AC bus 10;

[0046] For the sake of generality, the order of the DC voltages of each DC system is recorded as E 1 2 3 4 ;

[0047] One side of the first converter 1 is connected to the first DC system 21 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, forming a branch circuit 1;

[0048] One side of the second converter 2 is connected to the second DC system 22 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, forming a branch ci...

Embodiment 2

[0057] Such as Figure 8 The five-port back-to-back DC-DC converter shown includes a first DC system 21, a second DC system 22, a third DC system 23, a fourth DC system 24, a fifth DC system 25, the first converter 1, The second converter 2, the third converter 3, the fourth converter 4, the fifth converter 5, the AC transformer 11, the AC circuit breaker 13, the phase reactance 12 and the public AC bus 10;

[0058] Record the order of the DC voltages of each DC system as E 1 2 3 4 =E 5 ;

[0059] One side of the first converter 1 is connected to the first DC system 21 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, forming a branch circuit 1;

[0060] One side of the second converter 2 is connected to the second DC system 22 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, fo...

Embodiment 3

[0067] Such as Figure 9 The shown four-port back-to-back DC-DC converter includes a first DC system 21, a second DC system 22, a third DC system 23, a fourth DC system 24, a first converter 1, and a second converter 2 , the third converter 3, the fourth converter 4, the AC transformer 11, the AC circuit breaker 13, the phase reactance 12 and the public AC bus 10;

[0068] In embodiment 3, record the DC voltage order of each DC system as E 1 2 3 4 ;

[0069] One side of the first converter 1 is connected to the first DC system 21 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, forming a branch circuit 1;

[0070] One side of the second converter 2 is connected to the second DC system 22 through the DC line 20, and the other side is connected to the common AC bus 10 through the AC transformer 11 and the AC circuit breaker 13 in turn, forming a branch circuit 2;

[0071] One s...

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Abstract

The invention provides a multiport back-to-back DC-DC converter which comprises a DC system, a converter, an AC transformer, an AC circuit breaker and a common AC bus. One side of the converter is connected with the DC system through a DC line, and the other side of the converter is connected with the common AC bus through the AC transformer and the AC circuit breaker. According to the multiport back-to-back DC-DC converter, multiple DC lines with the same voltage class or different voltage classes are interconnected through two-level DC-AC-DC exchange, DC fault partition isolation is achieved through reasonable control, the cost of the transformer is saved, the safety performance of the DC-DC converter is improved, and the operation safety stability of an entire DC power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission and distribution, and in particular relates to a multi-port back-to-back DC-DC converter. Background technique [0002] With the integration of new energy generation such as wind power and solar power into the grid and the development of direct current transmission technology, the interconnection of multiple direct current transmission lines to form a multi-terminal direct current transmission system and the subsequent large-scale new energy generation access to the direct current grid have become an industrial problem. New technical issues that are widely concerned by the world. For example, in order to form a DC power grid, the interconnection of DC systems in various regions is an urgent problem to be solved. [0003] An intuitive idea to form a DC grid is to use a DC circuit breaker to connect multiple DC lines together. Such a solution needs to solve two technical proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02M3/335
Inventor 姚良忠林卫星文劲宇苗璐王伟胜丁杰迟永宁李琰杨波徐晓慧孙蔚王志冰曹远志吴婧
Owner STATE GRID CORP OF CHINA
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