直驅(qū)式永磁風力發(fā)電系統(tǒng)最大功率跟蹤研究
[Abstract]:The problem of environmental pollution is becoming more and more serious, and the fossil energy on the earth is decreasing rapidly, so we must develop clean and renewable energy. Wind power has become the key field of energy industry because of its advantages of clean, pollution-free, short construction period, low operating cost and so on. Among all wind turbines, direct-drive permanent magnet wind power generation system has been developed rapidly because of its high efficiency and low fault. Firstly, this paper introduces the technical background of wind power generation and the development situation at home and abroad, and gives the structure of off-grid direct-drive permanent magnet wind power generation system. This paper discusses the theoretical basis of wind power generation, expounds the basic principle of coordinate transformation, gives the mathematical model of permanent magnet synchronous generator, and analyzes in detail the principle and characteristics of various chopping circuits. It lays a foundation for the analysis of the principle of maximum power tracing and the establishment of model. Secondly, the principle of maximum power tracking for direct-drive permanent magnet wind power generation system is studied, and the relationship between maximum power tracking and duty cycle is given. This paper introduces two ways of regulating the maximum power, and then compares and studies several commonly used maximum power tracking methods, the best tip speed ratio method, the power feedback method and the mountain climbing search method. Then, the mountain climbing method based on BOOST circuit is analyzed and studied in detail. Aiming at the shortcomings of traditional mountain climbing search method and gradient variable step size mountain climbing search method, an improved gradient variable step size mountain climbing algorithm is proposed. Finally, the maximum power simulation model and the combined wind speed simulation model of the small off-grid direct-drive permanent magnet wind power generation system are built on the MATLAB/Simulink platform. The characteristic curve and the combined wind speed curve of the wind turbine are simulated and outputted. It can be seen from the combined wind speed curve that the model simulates the randomness, gradual variation and mutation of wind speed, and compares the improved mountain climbing search method before and after the improvement. The results show that the improved gradient variable step size mountain climbing search method can not only track the maximum power points quickly, but also have high accuracy.
【學位授予單位】:西安理工大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM614
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