Engineering

Optimal Control of Wind Energy Systems: Towards a Global by Iulian Munteanu, Antoneta Iuliana Bratcu, Nicolaos-Antonio

By Iulian Munteanu, Antoneta Iuliana Bratcu, Nicolaos-Antonio Cutululis, Emil Ceanga

As a result of the stochastic nature in their basic power resource, manageable functionality of wind power conversion platforms can't be completed with no the contribution of computerized keep an eye on. optimum keep an eye on of Wind strength structures offers a thoroughgoing overview of the most keep watch over matters in wind strength iteration, supplying a unified photograph of the problems in optimum keep watch over of wind strength new release. a chain of optimum keep an eye on suggestions are analyzed, assessed and in comparison, beginning with the classical ones, like PI keep watch over, greatest energy element recommendations and gain-scheduling concepts, and carrying on with with a few glossy ones: sliding-mode options, suggestions linearization keep an eye on and strong regulate. dialogue is targeted on a world dynamic optimization method of wind energy platforms utilizing a collection of optimization standards which conform to a accomplished crew of necessities together with: strength conversion potency; mechanical reliability; and caliber of the strength supplied. the most effects are offered besides representation through case stories and MATLAB®/Simulink® simulation review. The corresponding programmes and block diagrams could be downloaded from the ebook s web page at springer.com. For the various case reports awarded, real-time simulation effects also are on hand, illustrative examples that allows you to be invaluable in easing know-how move up to speed engineering linked to wind energy platforms. regulate engineers, researchers and graduate scholars attracted to studying and using systematic optimization methods to wind energy structures will locate this a most valuable consultant to the sphere.

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15) Thus, the mean wind power density is proportional to the EFP and the cube of the wind speed. 3. 3. 19) The pair vopt , v* calculated for a given site by using the Weibull distribution, can offer useful qualitative information about the wind energy resource. In conclusion, the Weibull distribution gives information about the annual variation of the wind speed as well as on the mean power density of a given site. A good case scenario is having a site which can be characterized by a Weibull distribution with a high scale factor (c) and a reduced shape factor (k).

10. General structure of an improved variable-speed WECS The DFIG is a WRIG with the stator windings connected directly to the threephase, constant-frequency grid and the rotor windings connected to a back-to-back (AC–AC) voltage source converter (Akhmatov 2003; Ackermann 2005). Thus, the term “doubly-fed” comes from the fact that the stator voltage is applied from the grid and the rotor voltage is impressed by the power converter. This system allows variable-speed operation over a large, but still restricted, range, with the generator behaviour being governed by the power electronics converter and its controllers.

Therefore, the electrical machine will experience an increased rotational speed and a reduced electromagnetic torque. The speed multiplier dissociates the transmission in two parts: the low-speed shaft (LSS) on which the rotor is coupled and the high-speed shaft (HSS) relied on by the electrical generator. The coupling between the two shafts can be either rigid or flexible. In the second case, the LSS and HSS have different instantaneous rotational speeds. This kind of decoupling is used for damping the mechanical efforts generated either by wind speed or by electromagnetic torque variations.

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