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Series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration

A technology of offshore wind power and DC power grid, applied in wind power generation, power transmission AC network, circuit devices, etc., can solve the problems of high cost construction and maintenance costs, and achieve the effect of saving costs

Active Publication Date: 2017-07-07
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of construction and maintenance of this method is relatively high.

Method used

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  • Series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration
  • Series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration
  • Series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration

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Embodiment Construction

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0043] An embodiment of a method for starting a hybrid DC power grid for large-scale remote offshore wind power grid integration provided by the present invention is as follows: figure 1 As shown, the structure of the hybrid DC grid is as follows figure 2 As shown, it includes the VSC converter and the LCC converter; the VSC converter is connected to the offshore wind farm, the LCC converter is connected to the land AC system, and the VSC converter and the LCC converter are connected through a submarine DC cable. The specific s...

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Abstract

The invention provides a series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration. The method comprises steps: 1, an LCC converter is controlled to charge a VSC converter; 2, a wind generating set is integrated to an offshore wind farm one by one; and 3, the LCC converter is controlled to work in an inverter state, and operates in parallel with the VSC converter. Compared with the prior art, the series-parallel DC power grid starting method for large-scale long-distance offshore wind power integration provided by the invention is simple and easy to operate, the economic performance is good, and a small-scale AC starting power supply at a long-distance offshore wind farm side is not needed.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a method for starting a hybrid direct current power grid for large-scale long-distance offshore wind power grid integration. Background technique [0002] At present, LCC-HVDC is widely used in submarine cable power transmission, large-capacity long-distance power transmission, and back-to-back interconnection of asynchronous power grids. Defects such as a large amount of reactive power restrict its further development. The voltage source converter high-voltage direct current transmission (VSC-HVDC) based on fully-controlled power electronic devices has the advantages of independent control of active and reactive power, no commutation failure, and power supply for passive islands, but the system is expensive and expensive. Cannot effectively handle DC faults. In order to make reasonable use of the advantages of LCC-HVDC and VSC-HVDC systems, a hybrid DC tran...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/36
CPCH02J3/386H02J3/36Y02E10/76Y02E60/60
Inventor 吴广禄王峰李亚楼李蒙安宁陈绪江王艺璇彭红英穆清孙丽香王祥旭
Owner CHINA ELECTRIC POWER RES INST