Double-fed wind generation set high-voltage penetration method capable of realizing inactive support

A wind turbine, high-voltage technology, applied in the field of double-fed wind turbine high-voltage ride-through, can solve the problem of no further restrictions on the reactive power arrangement of the unit

Inactive Publication Date: 2013-06-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this regulation gives a clear grid-connected operation range for wind turbines, it does not further limit the reactive power arrangement of the wind turbines during the voltage surge period, and there are few reports on this in domestic and foreign related literature

Method used

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  • Double-fed wind generation set high-voltage penetration method capable of realizing inactive support
  • Double-fed wind generation set high-voltage penetration method capable of realizing inactive support
  • Double-fed wind generation set high-voltage penetration method capable of realizing inactive support

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawings and examples of implementation.

[0025] figure 1 It is a structural diagram of the doubly-fed wind turbine system applicable to the present invention, mainly including doubly-fed induction generator DFIG, grid-side converter GSC, rotor-side converter RSC, DC capacitor C, grid-side incoming line reactor, upper machine and drive board; in the figure, U T is the grid-connected point-to-line voltage, V dc is the DC bus voltage, P s , Q s are the active power and reactive power absorbed by the stator of the doubly-fed induction generator, respectively, P g , Q g are the active power and reactive power absorbed by the grid-side converter, respectively, P t , Q t are the total active power and total reactive power absorbed by the DFIG, respectively;

[0026] refer to figure 2 , a doubly-fed wind turbine high-voltage ride-through method that can realize reactive power supp...

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Abstract

The invention discloses a double-fed wind generation set high-voltage penetration method capable of realizing inactive support. The method includes detecting grid-connected point-line voltage UT, and direct-current bus voltage Vdc in real time; when grid-connected point-line voltage UT is smaller than 1.1 times of nominal value, controlling a grid-side converter to work at a unit power factor mode and a rotor-side converter to work at a highest power track mode through an upper computer; when the grid-connected point-line voltage UT is not smaller than 1.1 times of nominal value, controlling the grid-side converter to work at a bus voltage control model and the grid-side converter to work at an inactive power support mode; by a self-adaptation direct-current unloading circuit, judging self on and off according to the size of Vdc. By dynamic inactive current instruction optimization of the grid-side converter and the rotor-side converter and real-time protection of the self-adaptation direct-current unloading circuit, grid-connected operation of a double-fed wind generation set during voltage boosting of a power grid is guaranteed, certain dynamic inactive support is provided for fault power grid, fast restoration of the fault power grid is facilitated, and safe and reliable operation of other grid-connected loads is guaranteed.

Description

technical field [0001] The invention relates to a doubly-fed wind turbine high-voltage ride-through method capable of realizing reactive power support, which can ensure that the wind turbine does not run off-grid when the grid-connected point voltage suddenly rises and fails, and can use the reactive power control function of the turbine itself to control the wind turbine. The faulty grid provides certain reactive power support, which is conducive to the rapid recovery of the faulty grid and the safe operation of other grid-connected loads. Background technique [0002] In recent years, with the expansion of the single-unit capacity of wind turbines and the rapid increase in the proportion of total installed capacity in the power grid, countries around the world have issued wind power grid-connected guidelines, which put forward clear requirements for the stability and reliability of grid-connected wind turbines. . Among them, the most difficult and relatively high technica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY04S10/52
Inventor 徐海亮贺益康章玮
Owner ZHEJIANG UNIV
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