Study On The Improved Hill Climbing Method For Maximum Wind Energy Capture

The development and utilization of wind energy have been paid more and more attention all over the world.The maximum wind energy capture is one of the key problems in wind power generation system.Hill climbing method is a common method to achieve maximum wind energy capture.In practical application,there are some problems such as random selection or empirical selection of initial speed,the initial step size and the step size are selected by experience.This paper focuses on the maximum wind energy capture problem,studies the maximum wind energy capture point search method improved by the common problems of hill-climbing method to achieve the maximum wind energy capture point.First of all,to analyze the characteristics of wind power generation system.According to the principle of direct drive wind power system and related mathematical modeling,using Simulink simulation tool to establish the simulation model of permanent magnet wind power generation system.Secondly,for the uncertainty of the initial angular velocity selection of the hill-climbing,the optimal tip speed ratio method is introduced,the optimal tip speed ratio method of climbing is given,and the optimal angular velocity obtained by the optimal tip speed ratio method is used as the starting point of the hill climbing method;On the basis of the optimal tip speed ratio method,according to the initial step length of the method of climbing,this paper proposes an adaptive initial step hill climbing method based on the error analysis of the optimal angular velocity obtained by the optimal tip speed ratio method.The simulation results show that the proposed adaptive hill-climbing method can speed up the search and improve the search results.Based on the analysis of the wind energy utilization coefficient curve,according to the characteristics of the mountain climbing search in the range of the maximum wind energy capture point,an adaptive variable scale factor hill climbing method is proposed.The simulation results show that the proposed method can reduce the shock of the maximum wind energy capture point.Finally,for the error between the optimum angular velocity and the initial hill climbing angular velocity obtained by the optimal tip velocity ratio method is relatively large,a fuzzy search algorithm is proposed.On the basis of the optimal tip speed ratio method,using fuzzy search to obtain the angular velocity error correction,and get the initial value of climbing angular velocity less error with the best angular velocity,then using the improved mountain climbing by fourth chapter search optimal angular velocity.In the design of fuzzy controller,the slope of wind energy utilization coefficient curve and the wind speed are used as the input,and the initial acceleration correction value determined by the optimal tip speed ratio method is used as the output.The input and output domain is determined by the data analysis,according to the relationship between the error ratio of the optimal tip speed ratio method and the wind speed,the relationship between the coefficient of wind energy utilization and the optimal rotation speed error,the fuzzy rules are determined,through the analysis of the experimental results,we can speed up the search speed and reduce the shock of the maximum wind energy capture point.