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Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT)

A wind turbine and dynamic voltage technology, which is applied in the direction of AC network voltage adjustment, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of grid voltage level deterioration, wind turbine off-grid, etc., to reduce the impact, Fast response and good compensation effect

Inactive Publication Date: 2011-02-09
北京三得普华科技有限责任公司 +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a dynamic voltage stabilizer for assisting wind power generators to achieve low-voltage ride-through, aiming at problems such as the deterioration of the grid voltage level that may be caused by the existing DFIG when encountering a grid voltage drop, and even wind turbine off-grid , a voltage compensation device connected in series between the user and the system, once the system voltage is detected to be disturbed, the DVR will generate a certain voltage to offset the change of the system voltage

Method used

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  • Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT)
  • Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT)
  • Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT)

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Embodiment Construction

[0026] The dynamic voltage stabilizer proposed by the present invention for assisting wind power generators to realize low-voltage ride-through, its structure is as follows figure 1 shown, including:

[0027] The isolation transformer is used to electrically isolate the wind turbine and the dynamic voltage stabilizer. The primary side of the isolation transformer is connected to the wind turbine, and the secondary side is connected to the AC side of the single-phase uncontrolled rectifier bridge;

[0028] The single-phase uncontrolled rectifier bridge is used to rectify the output voltage of the wind turbine to obtain the DC bus voltage. The single-phase uncontrolled rectifier bridge is composed of two bridge arms, and each bridge arm includes two upper and lower diodes. The DC side of the controlled rectifier bridge is connected in parallel at both ends of the DC bus capacitor;

[0029] The DC bus capacitor is used to stabilize the DC bus voltage, and the two ends of the DC ...

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Abstract

The invention relates to a dynamic voltage stabilizer for assisting a wind driven generator in realizing low voltage ride through (LVRT), and belongs to the technical field of power system flexible alternating current power transmission and distribution and power electronics. The dynamic voltage stabilizer consists of three same single phase alternating current and direct current (AC-DC-AC) conversion full bridge structures; a normal AC transformer is connected with a single phase H bridge structure uncontrolled rectifier to form each phase; a capacitor is connected with a single phase H bridge inverter; and an AC port of the inverter is directly connected with the capacitor and a power grid through a filter inductor. The dynamic voltage stabilizer has the functions of voltage compensation and active power absorption, can assist doubly-fed induction wind motor in realizing the LVRT function when voltage drops off, improves the power generation capacity of a wind power station when the power grid fails, has a simple structure, can obtain good voltage compensation effect and dynamic response characteristic, is suitable for industrial production, and improves the reliability of the wind power station.

Description

technical field [0001] The invention relates to a dynamic voltage stabilizer for assisting a wind power generator to realize low-voltage ride-through, and belongs to the technical fields of flexible AC power transmission and distribution of power systems and power electronics. Background technique [0002] In today's increasingly prominent energy and environmental problems, wind energy has become the most promising alternative energy due to its unique advantages. At the same time, considering the intermittence and volatility of wind energy itself, the wind power generation system poses new requirements and challenges to the traditional grid operation. [0003] Doubly-fed induction generator (hereinafter referred to as DFIG) is one of the most widely used wind generators in the world. With the increasing capacity of DFIG units and the scale of wind farms, the interaction between wind turbines and the grid is becoming more and more significant, especially when the grid voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/12
CPCY02P80/20
Inventor 洪芦诚魏应冬姜齐荣王志泳
Owner 北京三得普华科技有限责任公司
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