An Adaptive Density Torque-Speed ​​Control Method for Wind Turbines

A wind turbine and speed control technology, applied in the control of wind turbines, wind power generation, wind turbines, etc., can solve the problem that the set value of the torque control loop of the wind turbine cannot accurately respond to changes in atmospheric parameters, and achieve maximum conversion and realization Power, the effect of improving adaptability

Active Publication Date: 2019-08-30
HUADIAN ELECTRIC POWER SCI INST CO LTD
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Problems solved by technology

[0004] The present invention proposes a torque-rotational speed control method for adaptive air density units, which changes the torque-rotational speed operation curve from the original one to a cluster, and solves the problem that the set value of the torque control loop of the unit cannot accurately respond to atmospheric parameters The problem of change makes the unit operate on different torque-speed curves under different air densities

Method used

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  • An Adaptive Density Torque-Speed ​​Control Method for Wind Turbines
  • An Adaptive Density Torque-Speed ​​Control Method for Wind Turbines
  • An Adaptive Density Torque-Speed ​​Control Method for Wind Turbines

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Embodiment 1

[0034] Such as figure 1 figure 2 As shown, first select the wind field and unit for technical transformation. The wind field should have sensors for measuring atmospheric pressure and humidity. The communication device and interface have a channel to upload variables to other platforms and exchange information with other systems. There are no quality defects in the blades, gearboxes and other large parts of the modified unit, and the subsystems (such as wind measuring device, pitch and yaw system, etc.) are operating normally, and the communication interface of the main control system of the unit is open.

[0035] Collect the design power curve of the unit, the reference torque-speed operation curve and the corresponding atmospheric parameters (including: atmospheric temperature, pressure, density, humidity).

[0036] The sampling frequency of the atmospheric pressure gauge and hygrometer meets the control cycle requirements of the main control system. The field-level monit...

Embodiment 1

[0040] The temperature difference between winter and summer in a wind farm in Ningxia is 30°C, and the density of a typical day without considering the humidity is 0.937kg / m 3 and 1.04kg / m 3 , The density difference is 11%. According to the operation principle of the unit, the torque setting value should also be increased by 11% in equal proportion, and the active power should be increased accordingly. The atmospheric parameters referenced by the unit’s original torque-speed operation curve are the atmospheric parameters of the design working conditions, which are quite different from the actual atmospheric parameters in winter and summer. In winter, the air density is high, and the unit cannot properly increase the torque setting value, resulting in the capture power There is a great loss; the air density in summer is relatively low, the torque setting of the unit is improper, the speed deviates from the optimal tip speed ratio, and the capture efficiency is low. In order to...

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Abstract

The invention provides a method for adjusting a wind turbine generator unit torque set value based on atmospheric density change. On the basis of analyzing the relation between the unit torque and the atmospheric density, the mapping relation between the unit torque and the atmospheric density is established; when the atmospheric density changes obviously, the torque set value is adjusted; the current situation that a standard torque and rotational speed operation curve determined at the unit design stage lacks adaptive and self-adjustment capability in atmospheric environmental change is changed. According to the method, density change is imported into the setting calculation section of the set value in the torque control link; the torque as an original uniform function of the rotational speed is turned into a function of the rotational speed and the density, so that the number of the torque and rotational speed operation curve is changed from one piece to one cluster. By means of the new method, units have good environmental adaptability. When the season and humidity change to cause change of the density, all the units can automatically adjust the torque set value. The unit operation power curve is improved. Control strategies can be realized well at the optimal tip speed ratio operation stage of the units.

Description

technical field [0001] The invention belongs to the field of wind power generation, relates to the field of wind turbine operation control design, and in particular relates to an adaptive density torque-speed control method of wind turbines. Background technique [0002] Wind power is currently a form of energy utilization with relatively mature technology, high degree of practicality, strong commercial development value and strong market competitiveness. The installed capacity is close to 100 million kilowatts. With the rapid growth of scale, the industry's attention to the operating performance of the unit has gradually increased. Relevant research has been carried out, and some problems have been found, such as that the operating efficiency of the unit cannot reach the design value, the long-term output under the same wind speed is lower than the guaranteed power, and the rated power The corresponding wind speed is higher than the design rated wind speed; the control str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D7/00
CPCF03D7/00Y02E10/72
Inventor 柴海棣范炜刘庆超张蕴
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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