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Jozef Zuščak, Vladimír Kujan and František Janíček

behavior of self-excited induction generator in Off-grid operation under resistive load” Power engineering 2018, Control of Power Systems 2018, 13th International scientific conference. Tatranské Matliare, Slovakia. June 5-7, 2018. 1. ed. Bratislava, Slovak University of Technology, 2018, pp.89–94. ISBN 978-80-89983-00-1.

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Maria Alexandra Nichifor

-turbines-dutch-flemish-border-area (accessed September 4th, 2016). David Suzuki Foundation. (2013), “Wind power opponents may be blowing hot air”, available at: http://www.davidsuzuki.org/blogs/science-matters/2013/04/wind-power-opponents-may-be-blowing-hot-air/ (accessed September 4th, 2016). de Boer, J., Zuidema, C. (2013), “Towards an integrated energy landscape”, Paper for AESOP-ACSP Joint Congress, available at: http://www.edgar-program.com/uploads/fckconnector/e887aba0-681d-4e00-ae4 (accessed September 5th, 2016). DutchNews. (2014), “Tourist companies join protests about

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Alexander Rubtsov

, pp. 1594-1601, 2007. Liu Sige; Zhou Xiaoxin; Fan Mingtian; Zhang Zhuping, "Probabilistic Power Flow Calculation Using Sigma-Point Transform Algorithm", International Conference on Power System Technology, 2006. PowerCon 2006, pp. 1-5, 2006. Pappala, V. S.; Erlich, I.; Rohrig, K.; Dobschinski, J., "A Stochastic Model for the Optimal Operation of a Wind-Thermal Power System", IEEE Trans. Power Syst. , vol. 24, no. 2, pp. 940-950, 2009. Pappala, V. S.; Erlich, I., "Management of Distributed

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V. Bezrukovs, Vl. Bezrukovs, A. Zacepins and V. Komashilovs

References 1. Shipkovs, P., Bezrukovs, V., Bezrukovs, V.l., Pugachevs, V., & Silutins, V. (8-13 May, 2011). Measurements of the wind energy resource in Latvia. World Renewable Energy Congress WREC, Sweden, Linköping, 0724 WE. 2. Bezrukovs, V., Bezrukovs, V.l., & Levins, N. (Oct. 2011). Problems in assessment of wind energy potential and acoustic noise distribution when designing wind power plants. The 52nd International Scientific Conference: Power and Electrical Engineering. Scientific journal of Riga Technical University, 13

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Przemysław Busse

the effects of wind farms on birds in the UK: the development of an objective assessment method . In: Birds and wind farms. Risk Assessment and Mitigation . Edit Quercus, Madrit. PSEW. 2008. Wytyczne w zakresie oddziaływania elektrowni wiatrowych na ptaki . Szczecin. Scottish Natural Heritage. 2011. Use of Avoidance Rates in the SNH Wind Farm Collision Risk Model . http://www.snh.gov.uk/docs/A305435.pdf. Smales I. 2006. Impacts of avian collisions with wind power turbines: an overview of the modellingof cumulative

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Yang Lua, Liping Suna, Jichuan Kanga and Xinyue Zhang

. Wind in power, 2014 European statistics . 2015. 9. Faulstich, S., Hahn, B., Tavner, P. J.: Wind turbine downtime and its importance for offshore deployment . Wind Energy, 2011, (14), 327–337. 10. Hameed, Z.: Role of grouping in the development of an overall maintenance optimization framework for offshore wind turbines . Proc. Inst. Mech. Eng. Part O J. Risk Reliab. 2012, 226 (6) S1, 584-601. 11. Hameed, Z., Hong, Y.S., Cho, Y.M., Ahn, S.H., Song, C.K.: Condition monitoring and fault detection of WTs and related algorithms: A review. Renew

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Krzysztof Pytel

, Warszawa, 2005. [5] Ozgenera O., Ozgener L.: Exergy and reliability analysis of wind turbine systems: A case study. Renewable and Sustainable Energy Reviews 11, 1811- 1826, 2007. [6] Pytel K.: Ekologia, ekonomia i edukacja wobec wyzwań odnawialnych źródeł energii. Wykorzystanie energii wiatru - aspekt technologiczny i ekologiczny, Divoir, Kraków, 2010. [7] Spinato F., Tavner P.J., van Bussel G.J.W., Koutoulakos E.: Reliability of wind turbine subassemblies. IET Renew. Power Gener., Vol. 3, Iss. 4, pp. 1- 15, 2009.

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Hany M. Hasanien and Essam A. Al-Ammar

References [1] SUN, T.-CHEN, Z.-BLAABJERG, F. : Transient Analysis of Grid-Connected Wind Turbines with DFIG after an External Short-Circuit Fault, Nordic Wind Power Conference, vol. 1, March 2004. [2] MUYEEN, S. M.-TAKAHASHI, R.-MURATA, T.-TAMURA, J. : Transient Stability Enhancement of Variable Speed Wind Turbine Driven PMSG with Rectifier-Boost Converter-Inverter, in Proc. International Conference on Electrical Machines (ICEM), Sep 2008. [3] CAO, W.-HUANG, X.-FRENCH, I.-LU, B. : Simulation of a Site

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D. Bezrukovs

REFERENCES 1. Jessner, A. (2011). Report on Windfarms and Radio Astronomy. Available at http://www.craf.eu/CRAF-11-01.pdf . 2. Jessner, A. (2010). Wind Power and Radio Astronomy. Available at http://www.craf.eu/windturb/Wind%20Power%20and%20Radio%20Astronomy.ppt . 3. Mattsson, S. (2010). Windturbines vs Radiosystems. Available at http://www.craf.eu/windturb/Vindkraft_Chalmers-Onsala_100427.ppt . 4. Bendz, E. (2010). Electromagnetic Interference from Wind Turbines on Onsala Space Observatory. Available at http

Open access

Tadeusz Koronowicz and Jan A. Szantyr

Abstract

The article presents a detailed discussion of the theoretical models of four different fluid dynamic devices: an ideal propulsor, an ideal fluid brake, an ideal screw propeller and an ideal turbine. The four models are presented with all relevant mathematical formulae regarding the forces, the power and the efficiency. It is demonstrated that the application of the model of an ideal optimum fluid brake according to the Betz theorem for determination of the maximum effectiveness coefficient of an axial wind turbine is not correct. In the case of a turbine the inclusion of important rotational flow losses may increase the maximum value of the turbine effectiveness coefficient above the level defined by Betz. Therefore the model of an ideal turbine should be an inversion of the model of an ideal screw propeller. This conclusion is supported by numerical calculations. It may influence the design procedures of wind turbines and may lead to increase in their efficiency.