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Offshore wind power plant low-frequency AC uncontrolled rectification power transmission system

A technology of power transmission system and AC system, which is applied in the direction of power transmission AC network, single-network parallel feeding arrangement, etc., to achieve the effect of avoiding use, reducing engineering cost and huge application value.

Active Publication Date: 2020-02-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there are few literatures on the low-frequency AC transmission system of offshore wind power, so it is necessary to study the low-frequency AC uncontrolled rectification transmission system of offshore wind farms

Method used

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  • Offshore wind power plant low-frequency AC uncontrolled rectification power transmission system
  • Offshore wind power plant low-frequency AC uncontrolled rectification power transmission system
  • Offshore wind power plant low-frequency AC uncontrolled rectification power transmission system

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Embodiment Construction

[0037] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Taking the pseudo-bipolar system as an example, the structure of the low-frequency AC uncontrolled rectification and transmission system of the offshore wind farm in the present invention is as follows: figure 1 As shown, including the onshore converter station and the offshore AC system, where:

[0039] The offshore AC system mainly includes wind turbines, AC submarine cables, busbars and offshore booster stations, in which the wind turbines are connected to the low-voltage side of the offshore booster station through AC submarine cables; the high-voltage side of the offshore booster station is connected to the busbar through AC submarine cables The busbars are connected, and the converging busbar is connected to the AC busbar on the wind field si...

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Abstract

The invention discloses an offshore wind power plant low-frequency AC uncontrolled rectification power transmission system, which comprises an onshore converter station and an offshore AC system, andis characterized in that the offshore AC system comprises a wind turbine generator, an AC submarine cable, a bus bar and an offshore booster station; the onshore converter station comprises a wind field side alternating current bus, an alternating current system side alternating current bus, an alternating current filter, an energy consumption device, a rectifier and an inverter. The rectifier iscomposed of a three-phase 6-pulse uncontrolled rectifier bridge, and the inverter can be an MMC or an LCC. The rated frequency of the offshore AC system is selected to be close to 10 Hz. Compared witha conventional flexible direct delivery scheme, the AC delivery scheme has higher technical mature level; according to the invention, the high technical maturity of an alternating current sending scheme is fully utilized; the economic power transmission length of the AC submarine cable is increased by reducing the rated frequency of the offshore AC system, and the offshore converter station and the onshore converter station are combined into a new onshore converter station, so that the use of an offshore platform can be reduced, the construction cost can be greatly reduced, and the system hashuge application value in actual engineering.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission and distribution, and in particular relates to a low-frequency AC uncontrolled rectification and transmission system of an offshore wind farm. Background technique [0002] In recent years, the problems of energy depletion and environmental pollution have become increasingly severe, while new energy power generation has the characteristics of pollution-free and sustainable, and its application prospects are extremely broad. Wind power generation is one of the most mature and large-scale power generation methods among new energy power generation technologies. With the development and application of wind power generation technology, the scale of wind farms is becoming larger and larger; due to restrictions on land resources and wind energy resources, Large-scale wind farms are often located in remote areas far away from power nodes or offshore. At present, the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36Y02E60/60Y02E10/76F03D9/257F05B2240/95H02M7/4835H02M5/4585H02M7/5395H02J3/381H02J3/46H02J2300/28H02M7/483
Inventor 徐政张哲任严铭
Owner ZHEJIANG UNIV