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Wind power station access method and device based on low-frequency transmission and high-voltage direct current transmission

A technology of high-voltage direct current transmission and connection method, which is applied in the direction of electric power transmission AC network, wind power generation, single-network parallel feeding arrangement, etc. High cost and other issues, to achieve the effect of improving power quality, improving transmission efficiency, and reducing line loss

Inactive Publication Date: 2011-01-19
长江水利委员会长江勘测规划设计研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the charging current of the AC cable, the transmission distance and transmission capacity of AC cable transmission and grid connection are limited
The wind farm adopts high-voltage direct current transmission technology to improve the power quality of wind farms connected to the grid. However, due to the repeated use of high-power power electronic converters, the system structure is complicated, the project cost is high, and the loss is increased.

Method used

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  • Wind power station access method and device based on low-frequency transmission and high-voltage direct current transmission
  • Wind power station access method and device based on low-frequency transmission and high-voltage direct current transmission
  • Wind power station access method and device based on low-frequency transmission and high-voltage direct current transmission

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Embodiment 1

[0030] Embodiment 1: Schematic diagram of a method for connecting a wind turbine to a rectifier-type wind farm based on low-frequency power transmission and high-voltage direct current transmission technology.

[0031] Such as figure 2 Shown is a method of connecting a wind turbine to a rectifier-type wind farm based on low-frequency transmission and high-voltage direct current transmission technology. The whole wind farm contains (M 1 +M 2 +---+M N ) 1 wind power generator, N bus lines. Each wind power generator 1 is equipped with a low-frequency box-type transformer 3 and a rectifier 4 . Each rectifier 4 converts low-frequency power into DC power, and through decentralized control of the wind power generators 1 connected to it, each wind power generator 1 can work at an ideal speed. The DC power is sent to the inverter 6 after converging through N converging lines. The inverter 6 converts the DC power into power frequency power, and connects it to the power frequency s...

Embodiment 2

[0032] Embodiment 2: Schematic diagram of a method for configuring a rectifier-type wind farm to connect to the power grid based on low-frequency power transmission and high-voltage direct current transmission technology.

[0033] Such as image 3 Shown is the method of connecting a rectifier-type wind farm to the grid based on a confluence line based on low-frequency transmission and high-voltage direct current transmission technology. The whole wind farm contains (M 1 +M 2 +---+M N ) 1 wind power generator, N bus lines. Each wind turbine 1 is equipped with a low-frequency box-type transformer, and each bus line is equipped with a rectifier 4, each M i (i=1, 2, ---, N) The low-frequency power generated by the wind power generator 1 is transmitted through the low-frequency box-type transformer 3 and then converged to the corresponding rectifier 4 . rectifier 4 through the corresponding M iThe centralized control of the wind generators 1 can realize the reasonable adjustm...

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Abstract

The invention discloses a wind power station access method based on low-frequency transmission and high-voltage direct current transmission, which comprises the steps of: 1, sending low-frequency power by a wind power generator, inputting the low-frequency power to a low-frequency transformer through a low-frequency cable for transforming, and rectifying the transformed low-frequency power; 2, transmitting direct current obtained after the low-frequency power is rectified to an inverter through a direct current cable, converting the direct current into power frequency power by the inverter; and 3, transmitting the power frequency power to a power frequency step-up transformer through the power frequency cable, and stepping up low voltage into high voltage to be transmitted to a power grid. The device comprises the wind power generator, the low-frequency cable, a low-frequency box type transformer, a rectifier, the direct current cable, the inverter, a power frequency cable and the power frequency step-up transformer. The invention overcomes the defect of limited synchronized transmission distance and capacity of alternating current cable transmission, increases the transmission capacity and distance of a wind power station access power grid, improves the synchronized power quality of a wind power station, reduces the line total loss, and enhances the transmission efficiency.

Description

technical field [0001] The invention relates to the technical field of low-frequency (50 Hz lower than power frequency) power transmission and high-voltage direct current transmission in power systems, and in particular to a wind farm connection method and device based on low-frequency power transmission and high-voltage direct current transmission. Background technique [0002] Due to the randomness of wind resources and the continuous expansion of the scale of wind farms, especially the continuous development of large-scale offshore wind farms, how to increase the transmission capacity and distance of wind farms and the impact of wind farms on grid power quality must be given sufficient attention. At present, due to the small scale of wind farms, AC cable transmission and grid connection with reactive power compensation devices are generally adopted. However, due to the influence of the charging current of the AC cable, the transmission distance and transmission capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36
CPCY02E10/763Y02E10/76
Inventor 刘海波高光华赵鑫杨家胜朱宜飞汪建
Owner 长江水利委员会长江勘测规划设计研究院
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