Power Flow Modelling in a Planetary Speed Increaser for Wind Turbines with Counter-rotating Electric Generator
The paper presents the kinematic and static modelling of a planetary speed increaser with one input and two outputs and a closed power loop, which is required in establishing the power flow transmitted by the increaser from a wind rotor to a counter-rotating electric generator (with mobile rotor and mobile stator), during operation at constant input power. The modelling algorithm starts in the first stage by establishing the block scheme for the connection of the component gears, two bevel gear pairs and a spur planetary gear set, and the kinematic and static correlations specific to the component mechanisms, and the inner and outer links of the speed increaser. The planetary speed increaser transmission functions are set up analytically in stage II of the kinematic modelling, followed by the determination of the relations for the transmission efficiency and torques on each power branch (stage III). In the second part of the paper a relevant numerical case is presented, which highlights the influence of the kinematic ratios of the bevel gear pairs on the amplification ratios and efficiencies, as well as the power flow through the planetary transmission. The results are useful to wind turbine designers and developers in the process of functional and constructive optimization of wind system solutions with a counterrotating electric generator.
KeywordsWind turbine Speed increaser Counter-rotating generator Power flow Efficiency
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- 1.Saulescu, R., Jaliu, C., Neagoe, M.: Structural and Kinematic Features of a 2 DOF Speed Increaser for Renewable Energy Systems. Applied Mechanics and Materials 823, 367-372 (2016).Google Scholar
- 2.Kumar, P.S., Abraham, A., Bensingh, R.J., Ilangovan, S.: Computational and experimental analysis of a counterrotating wind turbine system. Journal of Scientific & Industrial Research 72, 300-306 (2013).Google Scholar
- 3.Jamieson, P.: Multi Rotor Systems. In: Innovation in Wind Turbine Design. John Wiley & Sons, Ltd, Chichester, UK (2011).Google Scholar
- 4.Bursal, F.H., Folino, F.A., Maslow, J.E.: In-line transmission with counter-rotating outputs. Patent no. US6186922B1 (2001).Google Scholar
- 5.Climescu, O., Saulescu, R., Jaliu, C.: Specific features of a counter-rotating transmission for renewable energy systems. Environmental Engineering and Management Journal 10, 1105-1113 (2011).Google Scholar
- 6.Saulescu, R., Jaliu, C., Munteanu, O., Climescu, O.: Planetary Gear for Counter-rotating Wind Turbines. Applied Mechanics and Materials 658, 135-140 (2014).Google Scholar
- 7.Saulescu, R., Neagoe, M., Jaliu, C. Munteanu, O.: Comparative Analysis of Two Wind Turbines with Planetary Speed Increaser in Steady-State. Applied Mechanics and Materials 823, 355-360 (2016).Google Scholar
- 8.Booker, J.D., Mellor, P.H., Wrobel, R., Drury, D.: A compact, high efficiency contrarotating generator suitable for wind turbines in the urban environment. Renewable Energy 35, 2027-2033 (2010)Google Scholar
- 9.Saulescu, R., Neagoe, M., Jaliu, C.: Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems, Energies, 11(9), 2257, 1-33 (2018).Google Scholar
- 10.Kirschbaum, S.H.: Wind turbine-generator. Patent no. US4291233 (1981).Google Scholar
- 11.Diaconescu, D.V., Duditza, Fl.: Wirkungsgradberechnung von zwangläufigen Planetengetrieben. Teil II: Weitere Beispielrechnungen und Vorteile Antriebstechnik 33, 11, 61-63 (1994).Google Scholar
- 12.Miloiu, Gh., Dudita, Fl., Diaconescu, D.V.: Modern mechanical transmissions (in Romanian). Tehnica Press, Bucharest, Romania (1980).Google Scholar