Offshore wind power plant topological structure and control method thereof

A topology and fan technology, applied in parallel operation of DC power supply, harmonic reduction device, AC network to reduce harmonic/ripple, etc., can solve the problems of large converter station, high operating loss, narrow application range, etc. , to achieve high reliability, strong practicability, and improve the effect of practicability and reliability

Active Publication Date: 2019-12-31
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a topological structure of an offshore wind farm and its control method, which is used to solve the problem that the existing topological structure of an offshore wind farm is only applicable to a single offshore DC wind farm or an offshore AC wind farm and the converter station has large volume, high operating loss, and high cost. High and then there are technical problems with a narrow range of practical applications

Method used

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  • Offshore wind power plant topological structure and control method thereof
  • Offshore wind power plant topological structure and control method thereof
  • Offshore wind power plant topological structure and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A topological structure 100 of an offshore wind farm, such as figure 1 As shown, including: multiple offshore DC wind turbines, multiple offshore AC wind turbines, and combined converters;

[0051] The first DC port of the combined converter is connected to the first DC cable through the first current-limiting reactor, and then connected to each of the offshore DC wind turbines through the first DC cable; the AC port is connected through the AC cable Connected to each of the offshore AC wind farms; the second DC port is connected to the second DC cable through the second current-limiting reactor, and then externally connected to the onshore converter station through the second DC cable, for simultaneously collecting offshore DC The energy sent by the fan and the offshore AC fan is sent to the onshore converter station in the form of high-voltage direct current.

[0052] Such as figure 2 As shown in Fig. 1, the existing typical topology structure of offshore wind farm...

example 1

[0068] Example 1, the second converter unit 312 is composed of a twelve-pulse uncontrolled rectifier 312-1, a three-phase three-winding converter transformer 312-2, and a bypass switch 312-3. One winding of the three-phase three-winding converter transformer 312 - 2 is connected to the common AC bus 314 inside the combined converter 31 , and the common AC bus 314 is connected to the first AC port of the energy collection system 3 . The other two windings of the three-phase three-winding converter transformer 312-2 are respectively connected to the AC ports of the twelve-pulse uncontrolled rectifier 312-1. The bypass switch 312-3 is connected across the positive and negative busbars of the twelve-pulse uncontrolled rectifier 312-1, and is used to close when the second converter unit 312 fails, and bypass the second converter unit 312. to maintain the continuous operation of the non-faulty area of ​​the combined converter 31.

[0069] The third converter unit 313 is composed of...

example 2

[0070] Example 2, such as Figure 7 As shown, the second converter unit 312 or the third converter unit 313 consists of a six-pulse uncontrolled rectifier 312-4, a three-phase double-winding converter transformer 312-5, and a bypass switch 312-6. One winding constituting the three-phase double-winding converter transformer 312 - 5 is connected to the common AC bus 314 inside the combined converter 31 , that is, the first AC port. The other winding of the three-phase two-winding converter transformer 312-5 is connected to the AC port of the six-pulse uncontrolled rectifier 312-4. The bypass switch 312-6 is connected across the positive and negative busbars of the six-pulse uncontrolled rectifier 312-4, and is used to close when the six-pulse uncontrolled rectifier 312-4 fails, so that the six-pulse uncontrolled rectifier 312-4 performs a bypass to maintain the continuous operation of the non-faulty area of ​​the combined converter 31.

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Abstract

The invention discloses an offshore wind power plant topological structure and a control method thereof. The method is characterized by comprising a plurality of offshore direct-current fans, a plurality of offshore alternating-current fans and a combined converter, wherein a first direct-current port of the combined converter is connected with a first direct-current cable through a first current-limiting reactor and then is connected with each offshore direct-current fan through the first direct-current cable, an alternating-current port is connected with each offshore alternating-current fanthrough an alternating-current cable, a second direct current port is connected with a second direct current cable through a second current-limiting reactor, is externally connected with a shore converter station through a second direct current cable, and is used for simultaneously collecting energy sent by the direct current fan and the alternating current fan and sending the energy to the shoreconverter station in a high-voltage direct current mode. The offshore direct-current fan and the alternating-current fan are introduced into the offshore wind power plant topological structure at thesame time, the combined converter is combined, and problems that an offshore wind power plant cannot gather the direct-current fan and the alternating-current fan at the same time, an offshore platform is large in size and weight, and the capacity and loss of the converter are high in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of power transmission and distribution of power systems, and more specifically relates to a topological structure of an offshore wind farm and a control method thereof. Background technique [0002] The development of offshore wind farms from near seas to far seas has become a future trend. At present, the research on the development of offshore wind power in far seas is still in its infancy at home and abroad. Therefore, it is of great significance to study the topological structure of offshore wind farms applicable to far seas. For the external transmission of offshore wind power, the industry generally believes that when the transmission distance is greater than the critical distance of 55-70km, it is more economical to use HVDC transmission technology than AC transmission. Within the range, the use of AC transmission for external transmission has better economy and reliability. Therefore, for offshore wind farms,...

Claims

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Application Information

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IPC IPC(8): H02J1/10H02J3/38H02J3/01
CPCH02J1/10H02J3/01Y02E40/40
Inventor 文劲宇左文平周猛向往倪斌业蔡普成
Owner HUAZHONG UNIV OF SCI & TECH
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