Wind power system mppt control device and method based on wind speed measurement and estimation

Abstract

The invention provides a wind power system MPPT control device based on air speed measuring and estimating and a wind power system MPPT control method based on air speed measuring and estimating. A wind power system comprises a permanent magnet direct-drive wind power generator, a rectifier, a first capacitor, a second capacitor and a load. The MPPT control device comprises an MPPT controller, a wind speed sensor, a temperature sensor, an air pressure sensor, a rotating speed sensor, a voltage sensor, a current sensor, a DC-DC converter and a drive module. According to the wind power system MPPT control device based on air speed measuring and estimating and the wind power system MPPT control method based on air speed measuring and estimating, an air speed estimating signal and a ground air speed measuring signal are merged, the speed and accuracy for finding the maximum power point can be effectively improved, and power losses in the disturbance process are reduced.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, and more specifically, to a wind power system MPPT control device and method based on wind speed measurement and estimation. Background technique [0002] Due to its large reserves, clean and renewable characteristics, wind power has become one of the main directions of new energy power generation. Compared with double-fed fans, permanent magnet direct-drive fans have the advantages of no gearbox, less energy consumption, low maintenance costs, and better adaptability to low wind speeds. The output power of the wind power generation system is related to the external environment and load. Under certain external environment, there is a unique maximum power point. In order to improve the power generation efficiency of the wind power system, it is necessary to equip the wind power system with a Maximum Power Point Tracking (MPPT) control device and implement an effective MPPT c...

AI Technical Summary

Problems solved by technology

The effective wind speed is the effective value of the wind speed on the entire area of ​​the wind rotor, and the wind speed sensor can only measure the wind speed at a certain point, and the installation is relatively difficult. limit

[0004] Aiming at the problem that the effective wind speed is difficult to measure accurately, the industry has proposed a research idea based on wind speed estimation: first measure the fan speed and power information, and then establish the wind speed equation according to the power characteristics of the wind turbine, and then solve the wind speed

The disadvantages of this type of method are: first, the wind speed equation is a nonlinear equation, and it is difficult to solve it directly, and it is not easy to realize by hardware; second, it ignores the influence of air density on the power characteristics of the wind turbine. Under different conditions, the air density is different, resulting in a large error between the calculated wind speed and the real effective wind speed, which affects the accuracy of maximum power tracking.

The difficulty of this method is to obtain the optimal speed-power curve of the fan, which requires a lot of experiments and analysis, and the process is quite complicated

[0007] In summary, the existing maximum power tracking control methods of wind power systems have certain defects, which limit the maximum power capture of wind power systems, so it is necessary to improve

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