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A method, device and storage medium for controlling a doubly-fed wind turbine

A double-fed wind turbine and double-fed fan technology, applied in circuit devices, wind power generation, electrical components, etc., can solve the problems of secondary frequency drop, insufficient active power for frequency recovery, and inability to recover quickly, and achieve fast speed recovery speed, The effect of avoiding the frequency secondary drop problem

Active Publication Date: 2021-11-30
STATE GRID ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems: the inertial response capability weakens as the speed decreases, resulting in insufficient subsequent active power during the frequency recovery process, which causes the secondary frequency drop phenomenon
When the system frequency drops twice, the unbalanced power of the system is greater and the inertia is smaller, and the frequency cannot be recovered quickly. Due to the poor stability of rebalancing the power supply and load at low frequencies, it is easy to lose balance again, affecting the output of plant equipment in the system , causing malfunction and trip

Method used

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  • A method, device and storage medium for controlling a doubly-fed wind turbine
  • A method, device and storage medium for controlling a doubly-fed wind turbine
  • A method, device and storage medium for controlling a doubly-fed wind turbine

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Experimental program
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Effect test

Embodiment 1

[0055] refer to Figure 4 , this embodiment introduces a doubly-fed wind turbine torque limit control method, including:

[0056] Real-time acquisition of power system frequency and DFIG operating status data;

[0057] Based on the data obtained in real time, it is judged whether the system frequency disturbance of the double-fed fan occurs;

[0058] In response to no system frequency disturbance, the wind turbine is controlled in the maximum power tracking mode, otherwise the torque limit control mode is started to control the wind turbine;

[0059] The control process of the torque limit control mode includes:

[0060] Based on the data obtained in real time, it is judged whether the system frequency has dropped to the lowest point, and whether the kinetic energy released by the fan has reached the set ratio of the total available kinetic energy. Feed fan provides constant electromagnetic power support;

[0061] In the process of controlling the output power of the doubl...

Embodiment 1-1

[0064] refer to Figure 1-Figure 4 As shown, a specific implementation of embodiment 1 includes the following:

[0065] Real-time acquisition of power system frequency f, output electromagnetic power of double-fed fan, fan rotor speed, maximum power tracking curve, and calculation of captured mechanical power.

[0066] Calculate the frequency deviation Δf of the power system, the frequency change rate |df / dt|, the rotor kinetic energy released by the fan, and the difference between the output electromagnetic power of the fan and the captured mechanical power.

[0067] Judging whether the system frequency deviation and frequency change rate reach a corresponding preset startup threshold:

[0068] Define f as the power system frequency, Δf as the system frequency deviation, and T1 and T2 as the preset start-up thresholds of the frequency deviation and the rate of change respectively. In the present invention, when the system frequency deviation and the frequency change rate of ...

Embodiment 2

[0103] Based on the same inventive concept as Embodiment 1, this embodiment introduces a doubly-fed wind turbine control device, including:

[0104] The data acquisition module is configured to acquire power system frequency and real-time operating status data of double-fed wind turbines;

[0105] The disturbance judging module is configured to judge whether a system frequency disturbance occurs to the doubly-fed wind turbine based on the data obtained in real time;

[0106] a maximum power tracking mode control module configured to control the fan in a maximum power tracking mode in response to no system frequency disturbance;

[0107] a torque limit mode control module configured to control the fan in a torque limit control mode in response to occurrence of a system frequency disturbance;

[0108] The torque limit mode control module controlling the fan in the torque limit control mode includes:

[0109] Based on the data obtained in real time, it is judged whether the sys...

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Abstract

The invention discloses a doubly-fed wind turbine control method, device and storage medium. The method includes: detecting the running state data of the doubly-fed wind turbine in real time, and judging whether the doubly-fed wind turbine has a system frequency disturbance; The power tracking mode is used to control the fan, otherwise, the torque limit control mode is started to control the fan; in the torque limit control mode, the double-fed fan first provides constant power support, and then the active output decreases linearly with the speed until the output electromagnetic power of the double-fed fan is equal to The captured mechanical power difference approaches zero. In the subsequent acceleration stage, the active power of the double-fed fan first declines slowly with time, and then remains constant until it is equal to the maximum power tracking output value, and finally returns to the maximum power tracking control state. Utilizing the present invention can make the double-fed fan return to the rotating speed faster, and at the same time can largely avoid the secondary drop of the frequency, and can effectively improve the lowest point of the frequency drop in different frequency responses.

Description

technical field [0001] The present invention relates to the technical field of power system control, in particular to a doubly-fed wind turbine control method, device and storage medium. Background technique [0002] In recent years, the energy industry generally believes that in the current development and utilization of renewable energy, wind power generation is the most mature technology, the most promising power generation technology for large-scale development and commercialization. With the gradual maturity of wind energy utilization technology, the proportion of wind power generation in the grid continues to increase. Doubly-fed wind turbines have high power generation efficiency and small converter capacity, and have become one of the mainstream models in wind farms. [0003] Since the doubly-fed wind turbine usually operates in the state of maximum power tracking, its rotor speed is decoupled from the system frequency, and cannot play a supporting role when the fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/381H02J3/241H02J2300/28Y02E10/76
Inventor 刘福锁方勇杰李兆伟朱玲卿梦琪吴雪莲王玉唐飞赵学茂李威林文丽陶泉霖黄慧张红丽吕亚洲王超郄朝晖
Owner STATE GRID ELECTRIC POWER RES INST
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