Wind farm centralized fault ride-through device

A technology for fault ride-through and wind farms, applied in wind power generation, motor generator testing, reactive power compensation, etc., to achieve the effect of convenient movement, saving floor space and cost, and convenient detection

Active Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For wind farm centralized fault ride-through devices, because the capacity of the wind farms it adapts to is generally tens of megawatts, there is currently no low-voltage ride-through detection device with sufficient capacity to adapt

Method used

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  • Wind farm centralized fault ride-through device
  • Wind farm centralized fault ride-through device
  • Wind farm centralized fault ride-through device

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Experimental program
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Embodiment Construction

[0037] Attached below image 3 The specific implementation manner of the present invention will be described in further detail.

[0038] The centralized fault ride-through device for wind farms provided by the invention is suitable for fault ride-through of wind farms composed of constant-speed asynchronous wind turbines. The device can work respectively in the wind farm operation mode and the unit test mode. In the wind farm operation mode, the device will ensure that the wind farms composed of fixed-speed asynchronous wind turbines within the covered area meet the "Q / GDW-2009 Technical Regulations for Connecting Wind Farms to the Grid" and the wind power grid-connected guidelines of European and American countries. The specified low-voltage ride-through capability requirements of wind farms; in the unit test mode, the device can meet the requirements for the detection of equivalent low-voltage ride-through capabilities of a single fixed-speed asynchronous wind turbine.

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Abstract

The invention relates to a concentrated fault through device for a wind power station. The device can respectively work in a wind power station running mode and a unit test mode, and is arranged in a container mode or a container combined with outdoors mode. The device comprises transient voltage supporting parts, a transient reactive injection part and a power discharging part, wherein the transient voltage supporting parts are connected in series and arranged between the concentrated grid point of the wind power station and the concentrated collection line of a fan in the wind power station; the branches of the transient reactive injection part and the branches of the power discharging part are connected in parallel and linked on the concentrated collection line of the fan in the wind power station. The device are respectively divided into a steady-state running state and a transient-state running state in the wind power station running mode and the unit test mode, and certain master devices are multiplexed in the two modes, so that the covered wind power stations consisting of constant-speed asynchronous wind motor units can meet the demand of low-voltage through capability specified by the national standard and the U.S. and European wind power grid standards. When the running modes of the device are switched, the wind power station does not need to be in power failure.

Description

technical field [0001] The invention belongs to the field of new energy grid-connected testing, and in particular relates to a centralized fault ride-through device for wind farms. Background technique [0002] With the increasing proportion of wind power generation in electric energy, the influence of wind power generation system on the safe and stable operation of power grid can no longer be ignored. According to statistics: since 2011, there have been 35 wind turbine off-grid accidents in the operating area of ​​the power grid company, and a total of more than 3,800 wind turbines have been off-grid, which has seriously affected the safe and stable operation of the power grid and reliable power supply. Promotion and application are limited. [0003] One of the important reasons for large-scale off-grid accidents of wind turbines is that many wind turbines in wind farms do not have low-voltage ride-through capability. Facing the threat of wind power off-grid accidents to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/18G01R31/34
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 张振环徐桂芝贾跟卯段全新雷晰刘洋崔大伟张拓
Owner STATE GRID CORP OF CHINA
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