Improved MPPT (maximum power point tracking) control method based on initial rotation speed adjustment

A technology of maximum power point and tracking control, which is applied in the control of wind turbines, wind turbines, engines, etc., can solve problems such as difficult to find quantitative relationships, and achieve the effect of less information, simple and easy algorithm, and light calculation burden

Inactive Publication Date: 2012-05-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the key problem faced by this idea is that the optimal state of torque adjustment is closely rel

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  • Improved MPPT (maximum power point tracking) control method based on initial rotation speed adjustment
  • Improved MPPT (maximum power point tracking) control method based on initial rotation speed adjustment
  • Improved MPPT (maximum power point tracking) control method based on initial rotation speed adjustment

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Embodiment Construction

[0027] The present invention proposes for the first time an improvement idea of ​​shortening the tracking process of the maximum power point by shrinking the tracking interval of the fan speed, thereby improving the wind energy capture efficiency. And on this basis, an improved maximum power point tracking control method based on initial speed adjustment is designed. Compared with the improved method based on electromagnetic torque adjustment, it not only further improves the wind energy capture efficiency, but also the algorithm is simple and easy to be implemented and not easily affected by the change of wind speed conditions.

[0028] 1 Improvement ideas for shrinking the tracking interval

[0029] It can be seen from the object motion equation that in addition to increasing the absolute value of the acceleration, reducing the tracking distance can also shorten the tracking process of the maximum power point, thereby improving the tracking effect and increasing the wind ene...

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Abstract

The invention discloses an improved MPPT (maximum power point tracking) control method based on initial rotation speed adjustment. The design principle of the method is as follows: the wind speed average value exactly reflects the wind speed and wind energy concentrated distribution interval, therefore the optimal rotation speed tracking interval and the average wind speed have a direct relation in quantity and further can be easily pre-estimated, and iteration search is not needed. Compared with an improved torque adjustment method, the improved method provided by the invention not only can be used for improving the wind energy capture rate, but also is simple and practicable. Through the simulative calculation and comparative analysis of a simulative wind speed sequence, the effectiveness and advancement of the method are verified.

Description

technical field [0001] The invention belongs to the field of wind power generation, in particular to an improved maximum power point tracking control method based on initial rotational speed adjustment. Background technique [0002] In order to improve the wind energy capture efficiency below the rated wind speed range, the variable speed constant frequency wind turbine generally adopts the Maximum Power Point Tracking (MPPT) control strategy. Its control goal is to adjust the speed of the wind rotor to always run at the optimal speed, that is, the best tip speed ratio, as the wind speed changes, so as to capture and transform wind energy with maximum efficiency. Its realization methods mainly include: power curve method (also known as power signal feedback method or torque curve method), blade tip speed ratio method and hill climbing method. The most widely used method is the power curve method [0003] The traditional MPPT control, especially the power curve method, is m...

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Application Information

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IPC IPC(8): F03D7/00
CPCY02E10/723Y02E10/72
Inventor 殷明慧张小莲邹云叶星蔡晨晓
Owner NANJING UNIV OF SCI & TECH
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