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Permanent-magnetism direct-drive wind-driven-generator electromagnetic torque control method and device

A wind turbine, electromagnetic torque technology, applied in the field of wind power, can solve the problems of wind turbine over-power failure shutdown, wind turbine loss of power generation, reduction of generator power generation efficiency, etc., to improve power generation efficiency, improve control accuracy, The effect of avoiding overshoot and undershoot

Active Publication Date: 2015-09-23
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the above electromagnetic torque control, the inventor found at least the following problems in the prior art: During the actual operation of the permanent magnet direct drive wind turbine, the generator flux linkage value ψ f Affected by temperature changes or manufacturing deviations, there will be a change of ±10%, and the change of the flux linkage value of the generator by ±10% will cause the control accuracy of the electromagnetic torque of the generator to only reach ±10%.
When the change of the electromagnetic torque of the generator exceeds 10% of the given value of the electromagnetic torque, it will cause the wind turbine to fail to stop; when the change of the electromagnetic torque of the generator is less than 10% of the given value of the electromagnetic torque, it will cause the loss of the wind turbine. power generation
The above-mentioned over-generation and under-generation phenomena will lead to a reduction in the power generation efficiency of the generator

Method used

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  • Permanent-magnetism direct-drive wind-driven-generator electromagnetic torque control method and device

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Embodiment 1

[0023] figure 2 It is a schematic flowchart of an embodiment of the method for controlling the electromagnetic torque of the permanent magnet direct drive wind power generator provided by the present invention. The electromagnetic torque control method of the permanent magnet direct drive wind power generator in this embodiment may specifically include the following steps:

[0024] According to the actual value T of the generator torque active and the given value of generator torque T ref Control the actual value T of the electromagnetic torque of the generator e_active Track the given value T of the electromagnetic torque of the generator e_ref .

[0025] Specifically, the generator torque T in this step can specifically be the generator electromagnetic torque T e or generator output torque T output . The given value T of the generator electromagnetic torque e_ref Obtained according to the control strategy of the main controller of the generator.

[0026] The above ...

Embodiment 2

[0032] Figure 4 It is a schematic flowchart of another embodiment of the method for controlling the electromagnetic torque of the permanent magnet direct drive wind power generator provided by the present invention. Such as Figure 4 As shown, the permanent magnet direct drive wind turbine electromagnetic torque control method of this embodiment provides figure 2 A specific implementation of the electromagnetic torque control method of the permanent magnet direct drive wind power generator in the shown embodiment (according to the actual value of the generator electromagnetic torque and the given value of the generator electromagnetic torque, the actual value of the generator electromagnetic torque is controlled to track the power generation The given value of the machine electromagnetic torque), the permanent magnet direct drive wind power generator electromagnetic torque control method of the present embodiment can specifically include:

[0033] S401, according to the ac...

Embodiment 3

[0080] Figure 5 It is a schematic flowchart of another embodiment of the method for controlling the electromagnetic torque of the permanent magnet direct drive wind power generator provided by the present invention. Such as Figure 5 As shown, the permanent magnet direct drive wind turbine electromagnetic torque control method of this embodiment provides figure 2Another specific implementation of the method for controlling the electromagnetic torque of the permanent magnet direct drive wind power generator in the illustrated embodiment (controlling the actual value tracking of the electromagnetic torque of the generator according to the actual value of the output torque of the generator and the given value of the output torque of the generator) The given value of the generator electromagnetic torque), the permanent magnet direct drive wind power generator electromagnetic torque control method of the present embodiment can specifically include:

[0081] S501, according to t...

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Abstract

The invention provides a permanent-magnetism direct-drive wind-driven-generator electromagnetic torque control method and a device. The permanent-magnetism direct-drive wind-driven-generator electromagnetic torque control method comprises steps of controlling a practical value of a generator electromagnetic torque according to the practical value of the generator torque and a given value of the generator torque and tracking the given value of the generator electromagnetic torque. The permanent-magnetism direct-drive wind-driven-generator electromagnetic torque control method and the device control the practical value of the generator electromagnetic torque according to the practical value of the generator torque and the given value of the generator torque, track the given value of the generator electromagnetic torque, realize the closed-loop tracking of the given value of the generator electromagnetic torque, improve the control accuracy of the generator electromagnetic torque, prevent the over-generating and under-generating from happening and improve the generating efficiency.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method and device for controlling the electromagnetic torque of a permanent magnet direct drive wind power generator. Background technique [0002] Permanent magnet direct-drive wind turbines are high-power generators. Their power generally exceeds 1.5MW, and their rated torque can reach more than 800,000 N·m. Currently, there is no torque sensor with such a large range. [0003] In traditional permanent magnet direct drive wind turbine vector control, the electromagnetic torque of the generator is controlled by open loop. Specifically, the electromagnetic torque of the generator uses the formula T e =1.5p n (ψ f I q +(L d -L q )I d I q ) calculation, because in the high-power permanent magnet direct drive generator L d -L q ≈0, the electromagnetic torque adopts the approximate formula T e =1.5p n ψ f I q calculation, where I q is the quadrature current. Ther...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P101/15
CPCY02P80/10
Inventor 高瑞
Owner BEIJING ETECHWIN ELECTRIC