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Active load reducing control system and method for large wind turbine blade

A technology for wind turbine blades and active load reduction, applied in the control of wind turbines, engine control, wind turbines, etc., can solve problems such as difficulty in meeting blade load reduction requirements, the influence of fan blade load cannot be ignored, and difficult mathematical models.

Inactive Publication Date: 2016-08-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Due to the complexity of the blade structure, it is very difficult to establish an accurate mathematical model, and the impact of random wind and turbulent wind on the load of the fan blades cannot be ignored, so the conventional single-stage PID control is difficult to meet the load reduction requirements of the blades

Method used

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  • Active load reducing control system and method for large wind turbine blade
  • Active load reducing control system and method for large wind turbine blade
  • Active load reducing control system and method for large wind turbine blade

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0048] Such as figure 1 A large-scale wind turbine blade active load reduction control system is shown, the system includes a signal acquisition module, a control module and an electrical servo module;

[0049] The signal acquisition module includes an optical fiber strain sensor, a wind field signal sensing device in front of the machine, and an optical fiber strain signal processing device; the control module includes a 5-way low-pass filter, a 5-way analog-to-digital converter, a 4-way control unit, and a PLC , 4-way digital-to-analog converters and 4-way signal isolators; the electrical servo module includes 4-way flap actuator drive circuits and 4-way flap actuators;

[0050] The optical fiber...

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Abstract

The invention relates to an active load reducing control system and method for a large wind turbine blade. An optical fiber strain sensor measures a stress value of the root portion of the blade and transmits the stress value to a control unit; the control unit comprises a PID controller performing parameter optimization through a teaching and learning algorithm and a fuzzy controller for processing a strain force signal of the root portion of the blade; a flap swing angle is subjected to switching control through the fuzzy controller and the PID controller, and beneficial effects of fuzzy control and PID control are synthesized; meanwhile, a machine front wind field signal sensing device measures the front air speed of a wind turbine and transmits the front air speed to the control unit; a feedforward controller in the control unit calculates control quantities needed by uniform loads caused by reducing stochastic wind or turbulent wind by monitoring the change of the machine front air speed in real time; and the control unit couples the two parts of control quantities, and control over the flap swing angle is completed. The active load reducing control system and method for the large wind turbine blade effectively reduce the strain force of the root portion of the blade, the service life of the blade is prolonged, and the using cost of a wind turbine unit is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a large-scale wind turbine blade active load reduction control system and method. Background technique [0002] With the rapid development of wind power generation, wind turbines are also gradually developing towards offshore and large-scale trends, which puts forward higher requirements for the core components of wind turbines - fan blades. The large-scale fan means increasing the load of the fan and the quality of the system, which will increase the fatigue load and ultimate load sharply, seriously reduce the service life of the unit, and also increase the hardware and engineering costs and post-maintenance costs. [0003] In order to reduce the fatigue load and ultimate load of the wind turbine and improve the life of the wind turbine, the stability of the power generation and output, a large wind turbine blade with active trailing edge flaps has been...

Claims

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Application Information

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IPC IPC(8): F03D7/04
CPCF03D7/0232F03D7/044F05B2270/32F05B2270/706F05B2270/808Y02E10/72
Inventor 张文广李腾飞白雪剑刘吉臻曾德良牛玉广杨婷婷胡阳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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