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Tandem direct current boost collection system and control method thereof

A DC boost and series type technology, applied in the parallel operation of DC power supply, DC network circuit devices, electrical components, etc., can solve the problem of inability to cut off the DC unit, and achieve the effect of improving power supply reliability and reliability.

Pending Publication Date: 2022-03-11
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing technology cannot cut off some faulty DC units in the series-connected power generation units, thereby providing a series-type DC boost collection system and its control method

Method used

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  • Tandem direct current boost collection system and control method thereof
  • Tandem direct current boost collection system and control method thereof
  • Tandem direct current boost collection system and control method thereof

Examples

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Embodiment 1

[0043] An embodiment of the present invention provides a series-type DC boost collection system, such as figure 1 As shown, it includes: a series branch composed of multiple power generation modules connected in series, multiple switchgears, and multiple busbars, and the switchgear includes at least one switchgear.

[0044] Such as figure 1 As shown, when the switchgear 1 includes two switchgears 11 and the number of busbars 2 is two, both poles of the series branch 3 are connected to each busbar 2 through two switchgears 11, and the connection lines between the power generation modules 31 Any point above is connected to each busbar 2 through two switchgears 11; each busbar 2 is connected to the output terminal of the collection station.

[0045] It should be noted, figure 1 Only the connection method between the series branch and two busbars is shown in the figure. When there are more than two busbars and the switchgear includes two switchgears, the power generation module ...

Embodiment 2

[0057] An embodiment of the present invention provides a control method for a series DC boost and collection system, which is applied to the series DC boost and collection system of the first aspect. The control method includes: when the DC power generation unit fails or the section bus fails, by The switching status of the switchgear connected to the power generation module of the DC power generation unit, the bypass switch of the power generation unit, the bypass switch of the first power generation module, the bypass switch of the second power generation module, the first bus bypass switch, and the second bus bypass switch, To cut off the DC generating unit or generating module or section bus.

[0058] In a specific embodiment, such as figure 2 As shown, when the switchgear includes two switchgears and the number of busbars is two, it includes: when the system is in normal operation, the switchgear between the positive pole of the first-end power generation module of the c...

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Abstract

The invention discloses a series connection type direct current boost collection system and a control method thereof, the system comprises a series connection branch formed by connecting a plurality of power generation modules in series, a plurality of switch devices and a plurality of buses, each switch device comprises at least one switch device, and when the number of the switch devices is two and the number of the buses is two, the series connection branch is connected with the series connection branch. Two poles of the series branch are connected with each bus through two switch devices, and any point on a connecting line between the power generation modules is connected with each bus through two switch devices; and each bus is connected with the output end of the pooling station. The power generation module is connected with each bus through the switch equipment, the faulty power generation module is cut off by controlling the on-off state of each switch equipment, and a series branch is not cut off, so that the reliability of the collection system is improved.

Description

technical field [0001] The invention relates to the field of new energy DC grid-connected, in particular to a series-type DC boost collection system and a control method thereof. Background technique [0002] In recent years, new energy has become an important development direction of future energy transformation due to its rich resources, large power generation capacity, clean and green characteristics. With the continuous improvement of new energy grid-connected capacity and the increasing transmission distance, the capacitive effect of AC transmission lines and the fluctuation characteristics of power have gradually transformed the traditional AC collection-AC transmission mode into the AC collection-DC transmission mode. On the other hand, with the increase in the size of power generation units and the increase in the distance between power generation units, such as offshore DC wind farms, the problem of reactive charging current and overvoltage of AC collector lines in ...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J1/10
CPCH02J1/00H02J1/10
Inventor 程亭婷孔明李元贞周啸林志光
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD