Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR)

A technology for wind turbines and doubly-fed asynchronous wind power, which is applied in the direction of AC network voltage adjustment, reactive power compensation, etc., and can solve the problems of slow response speed and insufficient low voltage ride through capability.

Active Publication Date: 2014-02-05
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, since the DFIG stator is directly connected to the grid, it is easily affected by various grid faults. Therefore, when the grid drops, it has disadvantages such as slow response speed and insufficient low-voltage ride-through capability.

Method used

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  • Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR)
  • Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR)
  • Low voltage ride-through system and method of double-fed asynchronous wind generating unit based on dynamic voltage restorer (DVR)

Examples

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Embodiment

[0044] Embodiment: A DVR-based low-voltage ride-through system for doubly-fed asynchronous wind power generators (see figure 1 ), characterized in that it includes a doubly-fed asynchronous wind turbine and a DVR dynamic voltage restorer; wherein the doubly-fed asynchronous wind turbine is directly connected to the power grid; The output end is connected with the output end of the doubly-fed asynchronous wind turbine and the input end of the grid.

[0045] The doubly-fed asynchronous wind turbine (see figure 2 ) is composed of a wind power generating set and a converter; the wind generating set is directly connected to the grid, and the grid voltage is collected as the stator voltage; the converter voltage is collected as the rotor voltage; the converter includes a GSC grid-side converter and RSC rotor side converter.

[0046] The DVR Dynamic Voltage Restorer (see image 3 ) is composed of a controller unit, an energy storage unit, a parallel capacitor, an inverter circui...

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Abstract

A low voltage ride-through system of a double-fed asynchronous wind generating unit based on a dynamic voltage restorer (DVR) is characterized by comprising the double-fed asynchronous wind generating unit and the DVR. The low voltage ride-through system has the advantages that low voltage ride-through capacity of a DFIG unit is improved, and fluctuation of stator voltages can be also reduced and even eliminated through the DVR and an injection transformer.

Description

(1) Technical field: [0001] The invention relates to a DVR-based low-voltage ride-through system and method for a doubly-fed asynchronous wind power generating set, belonging to the technical field of power electronics. (2) Background technology: [0002] Energy is one of the three foundations of the objective world. Human beings are looking for a sustainable energy path, and the development and utilization of new and renewable energy is the focus of improving the energy system. Wind energy is the kinetic energy generated by the movement of large volumes of air over the Earth's surface. Due to the different temperature changes and the different water vapor content in the air after the ground is irradiated by the sun, the air pressure in each place is different, and the high-pressure air flows to the low-pressure area in the horizontal direction. Wind power is a renewable energy source, very environmentally friendly and clean. As a clean source of energy, wind energy has in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/30
Inventor 刘少宇周雪松吴浩马幼捷高明杰高峰王银明徐明王平赵希辉郑宇清
Owner STATE GRID CORP OF CHINA
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