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A Photovoltaic High Voltage DC Series Grid-connected System

A high-voltage DC and low-voltage DC technology, applied in the field of power systems, can solve problems such as low heat exchange efficiency, and achieve the effects of improving heat dissipation efficiency, shortening insulation distance, and improving heat exchange efficiency

Active Publication Date: 2020-11-03
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a photovoltaic high-voltage DC series grid-connected system, which solves the problem of low heat exchange efficiency in existing cooling methods

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  • A Photovoltaic High Voltage DC Series Grid-connected System
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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] figure 1 It is a structural diagram of a photovoltaic high-voltage DC series grid-connected system according to an embodiment of the present invention; figure 2 It is the cross-sectional view of the A-A' ...

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Abstract

The invention provides a photovoltaic high voltage DC series grid-connected system, and relates to the technical field of power systems. According to the photovoltaic high voltage DC series grid-connected system, a high voltage AC / DC converter is put in the insulated cooling medium of a first evaporator; an inductor is put in the insulated cooling medium of a second evaporator; a power semiconductor device is in contact with the outer wall surface of the second evaporator; and when the liquid insulated cooling medium is heated and gasified to be converted into gaseous insulated cooling mediumand then enters the condenser to be condensed into liquid insulated cooling medium, It enters the first evaporator and the second evaporator again to cool the high voltage AC / DC converter, the inductor and the power semiconductor device. The insulated cooling medium is the insulated cooling liquid which is directly connected with the heating component of the DC-DC converter for heat exchange, andthe liquid-gas phase change process absorbs heat and improves the heat exchange efficiency and improves the heat dissipation efficiency of the DC-DC Converter.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a photovoltaic high-voltage direct current series grid-connected system. Background technique [0002] With the construction of HVDC transmission network and the rapid development of HVDC distribution network, DC grid-connected DC-DC converter (Direct current-Direct current converter, DC-DC converter) is the solution to large-capacity long-distance transmission of electric energy and large-scale An effective means of gathering renewable energy can make full use of high-voltage direct current (HVDC) line corridors to achieve complementarity between multiple energy forms and multiple user types. At present, the common grid-connected form of photovoltaic power generation system is mainly integrated into the AC grid. With the rapid development of domestic flexible DC and traditional DC transmission, and more and more demonstration projects, photovoltaic power generation must h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H05K7/20
CPCH02M7/003H05K7/20936Y02E10/56
Inventor 国建鸿王环张玉波黄欣科王一波
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI