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A wind turbine subsynchronous oscillation suppression method and suppression system

A technology of sub-synchronous oscillation and wind turbines, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of additional cost, difficulty in debugging engineering parameters, low detection accuracy of fan speed deviation, etc., achieve high accuracy, good suppression effect, The effect of reducing the difficulty of implementation

Active Publication Date: 2019-02-22
NARI TECH CO LTD +4
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Problems solved by technology

[0003] The research on wind power's participation in subsynchronous oscillation is still in its infancy. At present, the suppression measures proposed by relevant scholars are mostly from the perspective of the power grid, such as installing FACTS devices near wind farms, which will increase additional costs and make it difficult to debug engineering parameters.
Some scholars have also begun to pay attention to the suppression method on the fan side. Referring to the experience of thermal power units, they proposed to increase the damping control with the feedback of the speed deviation signal. However, there are still two difficulties in the engineering application of this method: 1. The speed deviation of the current fan The detection accuracy is too low to meet the control requirements; 2. The control method is based on the known subsynchronous oscillation frequency, and the current subsynchronous oscillation participated by wind power shows the characteristics that the oscillation frequency changes with the operating conditions, and it is difficult to predict the oscillation frequency

Method used

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  • A wind turbine subsynchronous oscillation suppression method and suppression system
  • A wind turbine subsynchronous oscillation suppression method and suppression system
  • A wind turbine subsynchronous oscillation suppression method and suppression system

Examples

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Embodiment

[0045] Example: application in doubly-fed wind turbines

[0046] Such as figure 1 As shown, the power generated by the doubly-fed unit is mainly injected into the grid through the generator stator, and its control usually adopts the DQ axis decoupling control method. The stator current DQ axis is given by the main control system of the wind turbine and output to the converter, and the stator current DQ axis is fed back by The stator current sampling of the converter is obtained through Park transformation, the difference between the stator DQ axis setting and the feedback is input to the stator current outer loop PI regulator, and the output is used as the DQ axis setting of the rotor current inner loop, and the rotor current DQ axis feedback is provided by the converter The rotor current sampling is obtained through Park transformation, and the difference between the rotor DQ axis reference and feedback is input to the rotor current inner loop PI regulator, and the output is ...

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Abstract

The invention discloses a synchronous oscillation inhibiting method of a wind turbine generator and an inhibiting system. The synchronous oscillation inhibiting method is realized on the basis of a wind power converter; a secondary synchronous oscillation inhibitor based on a secondary synchronous locking phase is added in an original power generation control; a damping component is generated by means of a synchronous coordinate system, and acted on a DQ axis current closed loop; current is dynamically adjusted, electric damping of the unit is enhanced, and thereby happening of secondary synchronous oscillation is inhibited. According to the method, the secondary synchronous oscillation signal is extracted from the electrical quantities, and the method can be adapted to the oscillation frequency and is strong in project practicability.

Description

technical field [0001] The invention belongs to the field of new energy power generation, and in particular relates to a subsynchronous oscillation suppression method and suppression system of a wind turbine. Background technique [0002] With the gradual expansion of wind power grid-connected capacity, its impact on the grid is also gradually emerging. In recent years, subsynchronous oscillations of regional power grids involving wind turbines have occurred in many regions, causing large-scale wind turbines to go off-grid, and even triggering the action of subsynchronous protection devices for adjacent thermal power units, causing thermal power units to shut down. In order to avoid subsynchronous oscillation from threatening the security of power grid, necessary measures should be taken to suppress the occurrence of subsynchronous oscillation. [0003] The research on wind power's participation in subsynchronous oscillation is still in its infancy. At present, the suppress...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 赵紫龙吴维宁孙素娟石磊过亮瞿兴鸿王瑞洪丹
Owner NARI TECH CO LTD
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