Topic
Tip-speed ratio
About: Tip-speed ratio is a research topic. Over the lifetime, 1621 publications have been published within this topic receiving 22072 citations.
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TL;DR: In this article, the development of the near wake of a vertical axis wind turbine is investigated by stereoscopic particle image velocimetry in an open-jet wind tunnel on an H-shaped rotor, operated at a tip speed ratio of 4.5 and an average chord-based Reynolds number of 1.7 × 10 5.
199 citations
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TL;DR: In this paper, the effect of the domain size and azimuthal increment on the performance of a 2-bladed VAWT operating at a moderate tip speed ratio of 4.5 using 2-dimensional and 2.5-dimensional simulations with the unsteady Reynolds-averaged Navier-Stokes (URANS).
192 citations
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TL;DR: In this paper, the influence of the buckets overlap ratio of a Savonius wind rotor on the averaged moment and power coefficients, over complete cycles of operation, is discussed, based on the commercial software Star-CCM+.
190 citations
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TL;DR: A GNG network has been trained offline to learn the turbine-characteristic surface torque versus wind and machine speeds and has been implemented online to obtain the wind tangential speed on the basis of the estimated torque and measured machine speed (surface function inversion).
Abstract: This paper presents a maximum power point tracking (MPPT) technique for high-performance wind generators with induction machines based on the growing neural gas (GNG) network. In this paper, a GNG network has been trained offline to learn the turbine-characteristic surface torque versus wind and machine speeds and has been implemented online to obtain the wind tangential speed on the basis of the estimated torque and measured machine speed (surface function inversion). The machine reference speed is then computed on the basis of the optimal tip speed ratio. For the experimental application, a back-to-back configuration with two voltage source converters has been considered, one on the machine side and the other on the grid side. The field-oriented control of the machine has been further integrated with an intelligent sensorless technique; in particular, the so-called total least squares (TLS) EXIN full-order observer has been adopted. Finally, a comparison with a classic perturb-and-observe MPPT has been made on a real wind-speed profile.
188 citations
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TL;DR: In this article, the authors presented a small signal modeling of a direct-driven permanent magnet synchronous generator (PMSG) based on wind turbine which is connected to the grid via back-to-back converters.
187 citations