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Variable boost DC grid-connected system

A power grid system and variable technology, applied in the direction of single-network parallel feeding arrangement, electrical components, etc., can solve the problem of increasing the investment in connecting the transformer equipment body, so as to improve the overall economy, save equipment cost, and avoid downtime Effect

Inactive Publication Date: 2021-09-17
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the transmission capacity of 500 and 200 is configured independently and redundantly for the connecting transformer. In practical applications, 50% of the transmission capacity is idle, which increases the investment in the equipment body of the connecting transformer itself.

Method used

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  • Variable boost DC grid-connected system
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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0027] It should be understood that the terms "first", "second" and the like in the claims, specification and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "comprises" used in the specification and claims of this application indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, intege...

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Abstract

The invention provides a variable boost DC grid-connected system. The variable boost DC grid-connected system comprises a current converter and a variable boost connection transformer. The variable boost connection transformer comprises a valve side winding, a first network side winding and a second network side winding, wherein the valve side winding is connected with the current converter; and the second network side winding is connected with a network side power grid system of the direct current grid-connected system after being connected with the first network side winding in series or in parallel.

Description

technical field [0001] The present application relates to the technical field of electric power system transmission, in particular to a variable boost DC grid-connected system. Background technique [0002] The DC transmission system is widely used in the power transmission of offshore wind farms or large-scale new energy bases, and there are two ways to send electricity to remote power grids: AC and DC. The AC transmission method uses power frequency AC conductors to send wind power, photovoltaic and other new energy power to land or remote load centers. This transmission scheme has a simple structure and low cost, but there are many restrictions on the application of the AC system, and the impact on the power grid is large. [0003] In order to obtain more offshore wind energy resources and cheaper photovoltaic new energy, offshore wind farms or land photovoltaic fields are gradually developing in the direction of deep sea or inland hinterland. For example, when the wind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J2300/28
Inventor 魏旭东詹长江刘为群董云龙李钢段军
Owner NR ELECTRIC CO LTD