Power tracking method of wind power generation system free of wind speed sensor

Abstract

The invention provides a power tracking method of a wind power generation system free of a wind speed sensor. The method comprises following steps: a motion equation of the maximum power tracking control of the wind power generation system is established; iterative optimization is performed on output power and rotor speed at the variable wind speed with the adoption of a variable step size algorithm, the maximum power point is tracked, and the optimal tip speed ratio is obtained by calculation; a fuzzy controller is adopted as a power controller, errors and error change rate of the tip speed ratio are taken as input, variable quantity of stator side regulation voltage is taken as output, a fuzzy rule is formulated, the output of the fuzzy controller is subjected to ambiguity resolution operation, and the corresponding accurate variable is obtained; the rotating speed of an electric generator is adjusted according to the variable quantity of stator side regulation voltage, control tracking for the rotor speed of the wind power generation system is realized, and the maximum power of the wind power generation system is tracked; adverse effects on output power of the wind power generation system under the conditions of inaccurate wind speed measurement and lagged wind speed measurement are avoided.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a power tracking method for a wind power generation system without a wind speed sensor. Background technique [0002] Coal, oil, natural gas, etc. are the most widely used energy sources. They are all non-renewable fossil resources, while wind energy is an economical, environmentally friendly, and renewable resource with huge reserves. Therefore, countries all over the world are stepping up the development of wind energy development and utilization. Wind power generation is the main form of utilizing wind energy in the world at present. Since wind power generation has a good prospect, the development and utilization of wind power resources is of great significance for alleviating energy shortage and protecting the ecological environment. [0003] In the wind power generation system, the wind speed, wind direction and wind intensity are highly random and transient. Therefore,...

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Problems solved by technology

[0005] In view of this, in order to solve the technical problems existing in the power optimization and control process of the wind power generation system in the prior art, the present invention provides a power tracking method for a wind power generation system without a wind speed sensor after theoretical research and experimental verification , applied in the wind power generation system without wind speed sensor, when the power characteristics of the wind power generation system are unknown, the tracking of the maximum power point of the wind power generation system can not only be realized and practically applied relatively easily, but also has a strong Stability and robustness, and also save system design cost, especially avoid the existing adverse effects on the output power of wind power system in the case of inaccurate wind speed measurement and lagging wind speed measurement

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