Control method and system of wind turbine

A technology of wind power generators and control methods, which is applied to the control of wind power generators, wind power generators, wind power generation, etc., and can solve problems such as the large difference in air density and the inability to optimize the operation of wind power generators

Inactive Publication Date: 2014-02-12
SINOVEL WIND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of realizing the present invention, the inventors found that among the diversity of environments, the air density of the environment where the wind power generation unit is located has the greatest impact on the energy capture, control and load of the wind power generation unit, while the controllers of the existing units are all Pre-designed, and are designed according to the estimated average air density, but the same wind turbine will encounter various climates during the operation cycle, the air density varies greatly, and the average air density is difficult to truly reflect The current environment in which the wind turbine is located, so this type of controller cannot maintain the optimal operating effect of the wind turbine in different environments and when the environment changes

Method used

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  • Control method and system of wind turbine
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  • Control method and system of wind turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] See figure 1 , Is a flowchart of a method in Embodiment 1 of the present invention, and the method includes:

[0107] S101: Obtain the air density in the current environment. Through real-time measurement of temperature, atmospheric pressure and air humidity, the air density of the environment where the wind turbine is located is measured and calculated. Preferably, step S101 may specifically include:

[0108] S1011: Get the temperature of the current environment,

[0109] S1012: Obtain the atmospheric pressure of the current environment,

[0110] S1013: Obtain the relative humidity of the current environment,

[0111] S1014: Obtain the partial pressure of water vapor in the saturated air at the current ambient temperature,

[0112] S1015: Use the formula

[0113]

[0114] Get the air density in the current environment. Among them: ρ(t) is the air density in the current environment, the unit is kg / m 3 ;Ρ 0 Is the standard air density, that is, the dry air density at 0°C and sta...

example 1

[0119] The theoretical maximum wind energy utilization rate of the blade is determined by the Bates limit, and the actual wind energy utilization rate of the wind turbine not only depends on the blade design and manufacturing level, but also has a direct relationship with the wind turbine control system design. For different wind speeds, the control system gives appropriate speed and torque setting values, which can make the blades run under the best tip speed ratio conditions, and the efficiency of the fan blades can reach the optimal value at this time. However, the optimal speed-torque control curve and parameters of different fans are quite different, which is mainly determined by the different optimal modal gains of different blades.

[0120] In Example 1, the control parameters specifically include: generator electromagnetic torque and generator speed;

[0121] In this case, step S102 may specifically include:

[0122] Obtaining the radius of the wind wheel, the gearbox transm...

example 2

[0131] The wind energy absorbed by wind turbines has a lot to do with air density. If the air density is low, such as in a high-altitude environment, the cut-in and cut-out wind speed will be higher for the same blade; if the air density is high, such as a low temperature environment or ocean environment, the cut-in and cut-out wind speed will be higher for the same blade. It should be set smaller. The control method proposed by the present invention optimizes and adjusts the cut-in and cut-out control of the unit through real-time measurement and calculation of the air density of the environment in which the wind generator unit is located, so that the unit can operate in a more reasonable wind speed range, increase the generation capacity of the unit, and ensure the unit safe operation. The cut-in and cut-out control is based on real-time measurement and calculation of air density, speed measurement, wind speed measurement, and unit control logic monitoring to optimize the cu...

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Abstract

An embodiment of the invention discloses a control method and system of a wind turbine. The method includes acquiring the air density of the current environment; adjusting control parameters of the wind turbine according to the air density of the current environment to allow the wind turbine to optimally operate in the current environment. According to the embodiment of the method, the air density of the current environment is measured, the control parameters, such as the electromagnetic torque of a generator, the generator speed, cut-in and cut-out wind speed, torque control determination, a limiting value for starting and shutdown yaw control and pitch control determination, can be calculated during a unit operating in real time, and control strategies can be optimized according to operating situation of the wind turbine, so that the wind turbine can operate at an optimal state in various climates, and the range of generating operation of the wind turbine can be expanded greatly.

Description

Technical field [0001] The present invention relates to the field of control of wind power generator sets above the megawatt level, in particular to a control method and system for wind power generator sets. Background technique [0002] The external environment in which wind turbines are located is diverse, including onshore normal temperature environment, onshore low temperature environment, land high altitude environment, offshore normal temperature environment, and offshore low temperature environment. Corresponding wind turbines are also divided into land-based normal temperature units, land-based low-temperature units, land-based high-altitude units, offshore units and offshore low-temperature units. The diversity of models must be matched by a suitable control system to achieve the best operating results. [0003] At present, the existing wind turbines generally have the problem of poor environmental adaptability. In the process of realizing the present invention, the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/00
CPCY02E10/723Y02E10/72
Inventor 韩俊良苏丽营杨明明何荣光杨天时
Owner SINOVEL WIND GRP
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