Aleksiievskyi D. Synthesis of wind power plants electromechanical systems with aerodynamic multiplication

Dissertation on achieving the scientific degree Doctor of Technical Science by specialty 05.09.03 "Electrotechnical Complexes and Systems" - Zaporizhzhya National University, Zaporizhzhia, 2020. The development of the synthesis theoretical base of the wind power plants electromechanical systems with aerodynamic multiplication, provide the maximum efficiency of wind turbines in power take-off from the wind flow terms and increase their operational reliability, was the dissertation subject. A generalized wind turbine with aerodynamic multiplication mathematical model was proposed. This model allows one to obtain theoretical dependencies describing the properties of a given system in a generalized form for the purpose of its use in the design of these systems. The graph analytical method for analyzing the effect of auto-optimization is proposed in the thesis. This method allowed us to give a theoretical explanation of the reasons for the appearance of the auto-optimization effect, discovered the conditions for its occurrence, and outlined the ways for its more efficient use. The decomposition method of the electromechanical system and the methodology for constructing circuits of energy conversion paths in these systems are also proposed in the paper. These methods allow us to consider a wide class of wind turbines with aerodynamic multiplication from a single theoretical point of view analyze and classify them according to structural features, and identify these features through visualization. A method of visual-block models synthesis of wind turbines with ADM is proposed. This method significantly shortens synthesis time and significantly reduces the probability of modeling errors. A formalized algorithm for the transformation of the visual-block model of the electrotechnical complex of wind turbines with ADM has been developed. An algorithm for the instantaneous control of a wind turbines electromechanical system with ADM was developed. The algorithm allows using the wind system with the rigid aerodynamic design of the primary wind wheel, which significantly reduces the capital and operational costs of the wind turbine and increases its operational reliability. The excess power amount dependence, during the transition process, when implementing the algorithm for instant control of the wind turbine electromechanical system with ADM, on the amplitude and frequency of the wind flow oscillations, which allows you to calculate the installed power in the elements of electrical equipment, are got as the result by mathematical modeling. As the result of the model experiment, the influence of the system parameters characteristics on the output power was obtained, which made it possible to determine the optimal control modes for the electromechanical system of wind turbines with ADM. With the help of an experimental wind turbine, the efficiency of the proposed method of instantaneous control of wind turbine with ADM was confirmed. The scheme and algorithm of functioning of the simulator of the aeromechanical subsystem are developed. This allows creating a stand for electrical equipment testing of wind turbines with ADM in laboratory or workshop conditions both at the development stage of new electrical equipment and during testing of electrical equipment during the batch production of these systems. The results of the work were used in the design of wind turbine electrical equipment with ADM TG-750, TG-1000 of OJSC "Preobrazovatel" Research Institute (Zaporizhzhya) and Concord CB (Dnipro) and in the prospective development of Golubenko CB of OJSC "Zgoda" (Dnipro) Wind turbine with ADM TG-2100 capacity of 2100 kW.