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Doubly-fed wind turbine generator control method and device and storage medium

A technology of doubly-fed wind turbines and doubly-fed wind turbines, applied in circuit devices, wind power generation, electrical components, etc., can solve problems such as insufficient frequency recovery active power, loss of balance, failure, etc.

Active Publication Date: 2020-10-27
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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  • Doubly-fed wind turbine generator control method and device and storage medium
  • Doubly-fed wind turbine generator control method and device and storage medium
  • Doubly-fed wind turbine generator control method and device and storage medium

Examples

Experimental program
Comparison scheme
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 control module performs fan control in a torque limit control mode including:

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

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Abstract

The invention discloses a doubly-fed wind turbine generator set control method and device and a storage medium, and the method comprises the steps: detecting the operation state data of a doubly-fed wind turbine generator set in real time, and judging whether the doubly-fed wind turbine generator set generates system frequency disturbance or not; in response to no system frequency disturbance, performing fan control in a maximum power tracking mode, otherwise, starting a torque limit control mode to perform fan control; in the torque limit control mode, the doubly-fed fan firstly providing constant power support, and then active output linearly decreasing along with the rotating speed until the difference between the output electromagnetic power of the doubly-fed fan and the captured mechanical power approaches zero; and in the acceleration stage, the active power of the doubly-fed induction generator slowly descending in a slope manner along with time, then keeping constant until theactive power is equal to the maximum power tracking output value, and finally returning to the maximum power tracking control state. By means of the method, the rotating speed of the double-fed fan can be recovered more quickly, meanwhile, secondary frequency drop can be avoided to a large extent, and the lowest frequency drop point can be effectively increased 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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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2300/28Y02E10/76
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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