Maximum power point tracking method of wind power generation system under condition of variable wind speed

Abstract

The invention discloses a maximum power point tracking method of a wind power generation system under the condition of a variable wind speed, and relates to the technical field of natural wind power generation automatic control. According to the method, when a draught fan is started or at the stage of a low wind speed, if output power of the draught fan is less than one half of rated power at the moment, a disturbance observation method is adopted; when the draught fan is at an operating stage and the wind speed becomes higher and rapidly changes, if the output power is higher than one half of the rated power and continues to rise at the moment, a particle swarm optimization algorithm is adopted; if the wind speed begins to reduce during operation, the output power of the draught fan is lower than one half of the rated power but still larger than a quarter of the rated power, the particle swarm optimization algorithm is still adopted until the output power is lower than a quarter of the rated power, and then the disturbance observation method is adopted. The method has the advantages that wind energy maximum power point tracking control can be well achieved, the tracking speed and the output power of the system are effectively improved, an output curve is relatively smooth, output vibration is reduced, and quality of electric energy is improved.

Description

Technical field [0001] The invention relates to the technical field of automatic control of wind power generation, in particular to a method for tracking the maximum power point of a wind power generation system under variable wind speed conditions. Background technique [0002] China has abundant wind energy resources. According to statistics, there are more than 750 million kW of wind energy that can be developed on land, and more than 250 million kW of offshore wind energy. The available wind energy area accounts for 76% of the country's area. As of the end of 2012, the installed capacity of large-scale wind turbines in China has reached 25.8 million KW. At the same time, there are still a large number of small-scale wind turbines operating independently in my country. According to statistics, there are hundreds of thousands of them. The current MPPT control algorithm for small wind turbines is mainly a disturbance observation method, but this method only considers the slow ch...

AI Technical Summary

Problems solved by technology

At present, the MPPT control algorithm of small wind turbines is mainly the disturbance observation method, but this method only considers the slow change of wind speed. In actual use, due to the random, uncertain and nonlinear characteristics of wind, the wind speed changes It is very complicated, so that the tracking efficiency of the wind power generation system using the disturbance observation method is reduced or the tracking fails under the condition of variable wind speed

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