Method and system for controlling pitch angle of wind turbine generator under power failure condition of power grid and device

A wind turbine and control method technology, which is applied in the control of wind turbines, mechanical equipment, engine control, etc., can solve problems such as adverse long-term stable operation of wind turbines, normal and stable operation of the entire wind turbine, and other problems, so as to overcome vibration. conditions, reducing the ultimate load, and improving the effect of operational safety

Active Publication Date: 2021-07-09
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When encountering extreme wind conditions while the wind turbine is in a special situation, the superimposed ultimate load tests the bearing capacity of the tower, which further seriously affects the normal and stable operation of the wind turbine.
When the wind turbine generator encounters a power failure of the grid, the converter will be disconnected from the grid instantaneously, and the torque of the generator will suddenly drop to zero. Experience the ultimate bending moment, which is not conducive to the long-term stable operation of the wind turbine

Method used

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  • Method and system for controlling pitch angle of wind turbine generator under power failure condition of power grid and device

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A method for controlling the pitch angle of wind turbines under grid power failure conditions, such as figure 1 shown, including the following steps:

[0055] Step 1) Obtain the grid power-off state of the current wind power generating set, when in the grid power-off state, the grid power-off flag is set to 1; when in the normal state, the grid power-off flag is set to 0;

[0056] Step 2) Obtain the front and rear acceleration data of the nacelle in the current wind power generating set, after data processing, obtain the additional pitch rate of the front and rear acceleration plus resistance loop of the nacelle;

[0057] The process of data processing is as follows: obtain the front and rear acceleration data of the nacelle in the current wind turbine, and after processing the front and rear acceleration data, obtain the pitch rate of the front and rear acceleration resistance loop of the nacelle; The pitch rate gain of the resistance loop; based on the pitch rate of ...

Embodiment 2

[0062] A method for controlling the pitch angle of a wind turbine under a grid power failure condition, comprising the following specific processes:

[0063] In the current detection cycle, the front and rear acceleration of the cabin is detected. Since there are interference signals in the measurement of the front and rear acceleration of the cabin, the front and rear acceleration signals of the measured cabin are filtered. At the same time, the power grid status is detected, and the grid power failure flag is 0. When the grid power failure occurs, the power grid power failure flag is 1. Obtain the current filtered acceleration signal of the front and rear of the nacelle, and integrate it to obtain the front and rear displacement velocity of the nacelle. Multiply the front and rear acceleration plus resistance gain of the nacelle by the front and rear displacement velocity of the nacelle to obtain the pitch position command of the front and rear acceleration-pitch loop of the...

Embodiment 3

[0067] Step 1) Detect the current grid power failure flag of the wind power generator set. If it is detected that the power grid is in a power failure situation, the grid power failure flag GLFlag is set to 1. If the power grid power failure of the unit is not detected, the grid power failure flag GLFlag is set to 0, and transmit the measurement signal to the main control PLC.

[0068] Step 2) Detect the current front and rear acceleration FAacc of the wind turbine nacelle, and transmit the measurement signal to the main control PLC.

[0069] Step 3) Filtering the measured front and rear accelerations of the nacelle to obtain the filtered front and rear accelerations FFAacc of the nacelle.

[0070] Step 4) Integrate the filtered nacelle forward and backward acceleration FFAacc to obtain the filtered nacelle forward and backward displacement rate FFAvel.

[0071] Step 5) Obtain the filtered forward and backward displacement rate FFAvel of the nacelle, and multiply it by the fo...

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Abstract

The invention discloses a method and system for controlling the pitch angle of a wind turbine generator under the condition of power failure of a power grid and a device, and belongs to the field of wind power generation. By detecting a power failure signal of the power grid, front and back acceleration signals of a cabin are introduced to participate in variable pitch control logic at the moment of executing a pitch stop shutdown operation, and the generator is prevented from experiencing the limit load to the greatest extent. The operation safety of the generator under the extreme wind condition is improved, real-time variable-rate pitch stop shutdown is adopted, the dynamic response characteristics of the whole machine are fully considered, and a corresponding variable-rate pitch stop instruction is calculated in real time. Under the power failure condition of the power grid, the front and back accelerations of the cabin are adopted as control input to participate in variable pitch control, the defect that the vibration condition of a tower and the whole machine is not considered in a traditional mode is overcome, and a cabin front and back acceleration-variable pitch rate control ring is introduced innovatively on the basis of the constant pitch stop rate. The dynamic response information of the whole machine in the detected front and back acceleration signals of the cabin is fully utilized, and the limit load of the tower is reduced in the variable-pitch action changing in real time.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a method, system and equipment for controlling the pitch angle of a wind turbine under the condition of a power grid failure. Background technique [0002] The tower is an important supporting part of the wind turbine, and its stress under different operating conditions affects the reliability and life of the tower. When encountering extreme wind conditions while the wind turbine is in a special situation, the superimposed extreme load tests the bearing capacity of the tower, which further seriously affects the normal and stable operation of the wind turbine. When the wind turbine generator encounters a power failure of the grid, the converter will be disconnected from the grid instantaneously, and the torque of the generator will suddenly drop to zero. Experiencing the ultimate bending moment is not conducive to the long-term stable operation of the wind turbine. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/00F03D17/00
CPCF03D7/00F03D17/00F05B2270/328Y02E10/72
Inventor 金强蔡安民林伟荣焦冲李媛许扬蔺雪峰
Owner HUANENG CLEAN ENERGY RES INST
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