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Offshore wind power flexible direct-current grid-connected system and starting method thereof

A flexible DC, offshore wind power technology, applied in power transmission AC network, wind power generation, circuit devices, etc., can solve problems such as the inability to ensure reliable startup of offshore wind power DC grid-connected systems

Active Publication Date: 2021-04-02
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Therefore, the offshore wind power flexible DC grid-connected system and its start-up method provided by the present invention overcome the defect that the offshore wind power DC grid-connected system cannot be reliably started in the prior art

Method used

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  • Offshore wind power flexible direct-current grid-connected system and starting method thereof
  • Offshore wind power flexible direct-current grid-connected system and starting method thereof
  • Offshore wind power flexible direct-current grid-connected system and starting method thereof

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Embodiment 1

[0035] An offshore wind power flexible DC grid-connected system provided by an embodiment of the present invention, when the voltage of the access point is low (such as 66V), it is only used as an example, not limited thereto, and is selected according to the actual voltage value in practical applications . Such as figure 1 As shown, it includes: AC power grid, onshore converter station, DC cable, offshore converter station, and offshore wind farm. Among them, onshore converter station includes onshore converter station AC field and onshore converter; The current station includes the offshore converter and the AC field of the offshore converter station; the AC grid is connected to the AC side of the onshore converter through the AC field of the onshore converter station, and the DC side of the onshore converter is connected to the offshore converter through a DC cable The DC side is connected, and the AC side of the offshore converter is connected to the offshore wind farm th...

Embodiment 2

[0042] A method for starting an offshore wind power flexible DC grid-connected system provided in an embodiment of the present invention is based on the offshore wind power flexible DC grid-connected system in Embodiment 1, such as image 3 shown, including the following steps:

[0043] Step S1: Start the backup power supply of the offshore converter station, and start the constant DC voltage control mode of the onshore converter to unlock the onshore converter when the DC side voltage of the onshore converter is greater than a first preset threshold.

[0044] In the embodiment of the present invention, start the backup power source of the offshore converter station, such as: diesel generator, this is just an example, not limited to this, in practical applications, select the corresponding backup power source according to actual needs, and maintain the The offshore converter station controls the normal operation of the protection system and necessary auxiliary systems. When th...

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Abstract

The invention discloses an offshore wind power flexible direct-current grid-connected system and a starting method thereof. The offshore wind power flexible direct-current grid-connected system comprises an alternating-current power grid, an onshore converter station, a direct-current cable, an offshore converter station and an offshore wind power plant, wherein the onshore converter station comprises an onshore converter station alternating-current field and an onshore converter, wherein the offshore converter station comprises an offshore converter and an offshore converter station alternating current field; the alternating-current power grid is connected with the alternating-current side of the onshore converter through an onshore converter station alternating-current field, the direct-current side of the onshore converter is connected with the direct-current side of the offshore converter through a direct-current cable, and the alternating-current side of the offshore converter isconnected with the offshore wind power plant through an offshore converter station alternating-current field. According to the starting method provided by the invention, soft starting of a plurality of transformers of the converter station is realized by controlling rising and falling of the slope of the alternating-current voltage of the offshore converter and cooperating with corresponding switching operation, operation cost is saved, and the safe operation level of a wind power direct-current grid-connected system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of offshore wind power grid connection, in particular to an offshore wind power flexible DC grid connection system and a starting method thereof. Background technique [0002] Offshore wind power grid-connected mainly includes AC grid-connected and DC grid-connected. Offshore wind power with a transmission distance of less than 80 kilometers can be sent in the form of AC grid-connected; From a safety point of view, it must be sent in a DC grid-connected manner. Compared with the offshore, the distant sea has broader sea area resources and a larger wind energy reserve. At present, the development of global offshore wind power is advancing from the near coast to the far coast. Due to the flexible operation mode and the characteristics of passive operation capability, the flexible direct current transmission system has become the mainstream technical means of offshore wind power grid integration. At present, t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/36
CPCH02J3/381H02J3/36H02J2300/28Y02E10/76Y02E60/60
Inventor 刘亚丽周啸孔明杨杰毛航银韩乃峥
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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