Double-fed wind driven generator system and low-voltage through control method

A low-voltage ride-through and wind power generator technology, applied in wind power generation, greenhouse gas reduction, energy storage, etc., can solve problems that hinder power grid voltage recovery, achieve low-voltage ride-through, improve low-voltage ride-through capability, and improve operating performance Effect

Inactive Publication Date: 2013-05-01
HOHAI UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

If a crowbar circuit is added, when the doubly-fed induction generator (DFIG) rotor is connected to the crowbar circuit and operates as a squirrel-cage asynchronous motor, the crowbar circuit will become a load that consumes inductive reactive power, not only cannot support the grid voltage drop, On the contrary, it hinders the recovery of the grid voltage after the fault is removed.

Method used

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  • Double-fed wind driven generator system and low-voltage through control method
  • Double-fed wind driven generator system and low-voltage through control method
  • Double-fed wind driven generator system and low-voltage through control method

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1As shown, the present invention designs a doubly-fed wind power generator system, including a doubly-fed wind power generator, a back-to-back converter, a low voltage ride-through control module, a crowbar circuit connected to the low voltage ride-through control module, and a battery storage energy device, voltage detection device, and current detection device; the doubly-fed wind turbine is connected in series to the input end of the power grid through the back-to-back converter, the battery energy storage device is connected in parallel with the DC link of the back-to-back converter, and the back-to-back converter includes the machine-side transformer converter and grid-side converter, as well as capacitors connected in parallel with the machine-side converter and grid-side converter, and the Cr...

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Abstract

The invention relates to a double-fed wind driven generator system and a low-voltage through control method. According to the double-fed wind driven generator and the low-voltage through control method on the basis of a Crowbar circuit and a battery energy storage device, the low-voltage through capability can be effectively improved under the condition of large-range voltage drop, the double-fed wind driven generator system can be still kept to be connected with a power grid, and the stability of a wind power system is improved.

Description

technical field [0001] The invention relates to a doubly-fed wind power generator system and a low-voltage ride-through control method. Background technique [0002] With the development of the world and China's economy, the consumption of energy will increase sharply, so that our country will face the double pressure of environment and resources for a long time in the future. The development of renewable energy including wind power is the most fundamental cause of my country's energy dilemma Solution. In my country, the coordinated planning and construction of wind farms and power grids is one of the key issues at present. The randomness and intermittency of wind speed lead to large fluctuations in the output of wind turbines. How to develop wind energy and integrate it into the grid to ensure the safe and stable operation of the grid is an urgent problem that needs to be solved. Technical requirements, such as low voltage ride through (LVRT) technology. [0003] In recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCY02E10/763Y02E70/30Y02E10/766Y02E10/76
Inventor 潘文霞张程程朱建红全锐向颖黎宋景博柯联锦张文豪
Owner HOHAI UNIV
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