Direct-current voltage control unit and method for wind power generation system

A wind power generation system, DC voltage technology, applied in wind power generation, electrical components, single-grid parallel feeding arrangement, etc., can solve problems such as small interference stability of DC voltage needs to be improved, and achieve the ability to maintain fault ride-through, avoid damage, The effect of enhancing the stability of small disturbances

Active Publication Date: 2013-10-02
HUAZHONG UNIV OF SCI & TECH
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But in the steady state, the small disturbance sta

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  • Direct-current voltage control unit and method for wind power generation system
  • Direct-current voltage control unit and method for wind power generation system
  • Direct-current voltage control unit and method for wind power generation system

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[0034] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] figure 1 It is a schematic diagram of the overall principle of the DC voltage control unit according to the present invention. Such as figure 1 As shown in the figure, the application object of the DC voltage control unit according to the present invention is, for example, a full-power wind power generation system. As is well known in the art, the wind power generation system includes a wind tu...

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Abstract

The invention discloses a direct-current voltage control unit for a wind power generation system. The direct-current voltage control unit comprises a machine-side controller, a network-side controller and a direct-current voltage controller, wherein the direct-current voltage controller is used for acquiring a direct-current voltage signal and a power grid frequency signal, calculating a corresponding active current instruction signal and a corresponding electromagnetic rotary torque compensation signal according to an acquisition signal, and outputting the active current instruction signal and the electromagnetic rotary torque compensation signal to the network-side controller and the machine-side controller respectively; the machine-side controller is used for acquiring a rotary speed signal of a power generator and a current signal of a stator of the power generator, and correspondingly adjusting a drive signal of a machine-side converter in combination with the electromagnetic rotary torque compensation signal; and the network-side controller is used for acquiring voltage and current signals, and correspondingly adjusting a drive signal of a network-side converter in combination with the active current instruction signal. The invention further discloses a corresponding direct-current voltage control method. Through the adoption of the direct-current voltage control unit and the method, the small interference stability of a direct-current voltage can be enhanced and the system fault ride-through capability can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and more specifically relates to a DC voltage control unit and method for a wind power generation system. Background technique [0002] The wind power generation system mainly includes a wind turbine, a generator that converts the mechanical energy of the wind turbine into electrical energy, a machine-side converter used to convert the AC voltage output by the generator into a DC voltage, and is electrically connected to the machine-side converter and used for storage. DC capacitors for electric energy, and grid-side converters for converting DC voltage to AC voltage. Among them, in order to achieve stable control of the DC voltage of the wind turbine, a machine-side controller or a grid-side controller is usually used to control it. At present, the method of using the grid-side controller to control the DC voltage has been widely used. In this method, the error between the detecte...

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Application Information

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IPC IPC(8): H02J3/38H02M5/458
CPCY02E10/76
Inventor 胡家兵黄云辉袁小明
Owner HUAZHONG UNIV OF SCI & TECH
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