The Study On Wind Generating Unites Control Technology

Wind energy is a green energy. Wind power generation rapidly develop all over the world because it is beneficial to energy developing and environment improving. Wind power will fleetly develop in China, too. For the sake of improving the efficiency of wind energy and increasing the life of the mechanical part, all kinds of research for WTGS will widely develop in many countries, many kinds of control arithmetic and strategy for WTGS have been advanced. But mass of them focused on blades control, power generation control and merging control, the technology for yaw system wasn't still developed for a long time.. Therefore, aim at this subject, related research and design will be reported in this thesis. Whether it is pitch system or yaw system, it is of great importance for improving the efficiency of using wind energy. For the yaw system, it must control the cabin always windward. Because the wind direction is always ceaselessly changed, the yaw control system has already became the important part of the control system for WTGS. There mainly exist two kind forms for yaw system: passive windward and active windward. Passive yaw system is used in small WTGS by tail helm controlling, and active one is generally used in large merged WTGS by the leeward vane controlling.At the same time, the elements for yaw control is in introduced in this paper. First,a two-component Weibull distribution(WW-probalility distribution function(pdf)) has been represented for wind regimes. Maximum Likelihood(ML) is applied in this paper. Second,the design of the wind energy yaw control system is realized by the proposed fuzzy logic controller .A study verified the proposed model using MATLAB for large WTGS. At last, by merging and improving, a novel strategy is studied in this thesis not only using wind direction sensor but also using the Hill Climbing control algorithm for large WTGS.