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Low-current pulsation duty ratio optimization method of direct-driven permanent magnet wind driven generator

A technology of wind turbines and optimization methods, which is applied in the directions of controlling generators, controlling generators, and motor generators through magnetic field changes, can solve problems such as magnetic saturation, reducing stability, generator jitter, etc., to simplify the calculation process , the effect of reducing current pulsation

Pending Publication Date: 2022-06-28
HUNAN UNIV OF TECH
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Problems solved by technology

Generator current pulsation will not only cause generator jitter and reduce stability, but also reduce generator efficiency and even cause magnetic saturation

Method used

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  • Low-current pulsation duty ratio optimization method of direct-driven permanent magnet wind driven generator
  • Low-current pulsation duty ratio optimization method of direct-driven permanent magnet wind driven generator
  • Low-current pulsation duty ratio optimization method of direct-driven permanent magnet wind driven generator

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Embodiment Construction

[0035] In order to describe the present invention more specifically, the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] like figure 1 As shown in the figure, a method for optimizing a low current pulsation duty cycle of a direct-drive permanent magnet wind turbine, the steps include:

[0037] (1) Collect the real-time data of the wind turbine and calculate the dq-axis reference voltage u at time k d * (k) and u q * (k);

[0038] (2) will Perform inverse park transformation to obtain the reference voltage u in the αβ coordinate system α * (k) and u β * (k), calculate the phase angle θ of the reference voltage vector, and calculate the sector sec where it is located according to the phase angle θ of the reference voltage vector;

[0039] (3) By pairing the vector duty cycle α g1 , α g2 Find the first-order partial derivative and calculate α g1 , α g2 the value of;

[0040] (4) When α g1 , α...

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Abstract

The invention discloses a low-current pulsation duty ratio optimization method for a direct-driven permanent magnet wind driven generator, and the method specifically comprises the steps: collecting the real-time data of a generator, and calculating the reference voltage of a dq axis; according to the reference voltage phase angle, calculating the sector of the reference voltage phase angle; solving a first-order partial derivative of the vector duty ratio to obtain the duty ratios alpha g1 and alpha g2 of two adjacent vectors; when the alpha g1 and the alpha g2 are smaller than 0, the action of the corresponding voltage vector is cancelled, when the alpha g1 and the alpha g2 are larger than 1, the voltage vector with the vector duty ratio larger than 1 acts on the whole period, and when the alpha g1 and the alpha g2 are in the range of [0, 1], the vector duty ratio is redistributed; and the three-phase duty ratio of the generator is redistributed. Generator stator current pulsation can be effectively reduced, and the stability of the system is improved.

Description

technical field [0001] The invention belongs to the field of wind power conversion control, and in particular relates to a low-current pulsation duty ratio optimization method of a direct-drive permanent magnet wind generator. Background technique [0002] Direct-drive permanent magnet wind turbines have been widely used due to their advantages of eliminating the need for gearboxes, high power density and high efficiency. Generator current pulsation will not only cause generator jitter and reduce stability, but also reduce generator efficiency and even cause magnetic saturation. Therefore, it is necessary to design a low-current pulsation duty cycle optimization method for direct-drive permanent magnet wind turbines. SUMMARY OF THE INVENTION [0003] In view of the defects or deficiencies described in the background art, the present invention provides a low-current pulsation duty cycle optimization method for a direct-drive permanent magnet wind generator, which improves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/14H02P9/10H02P21/00
CPCH02P9/14H02P9/105H02P21/0003
Inventor 张阳张炎钦文定都
Owner HUNAN UNIV OF TECH
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