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A Generalized Approach to the Steady-State Efficiency Analysis of Torque-Adding Transmissions Used in Renewable Energy Systems

Author

Listed:
  • Mircea Neagoe

    (Renewable Energy Systems and Recycling R&D Centre, Transilvania University of Brasov, 500036 Brasov, Romania)

  • Radu Saulescu

    (Design of Mechanical Elements and Systems R&D Centre, Transilvania University of Brasov, 500036 Brasov, Romania)

  • Codruta Jaliu

    (Renewable Energy Systems and Recycling R&D Centre, Transilvania University of Brasov, 500036 Brasov, Romania)

  • Petru A. Simionescu

    (Department of Engineering, College of Science and Engineering, Texas A & M University Corpus Christi, Corpus Christi, TX 78412, USA)

Abstract

The paper presents a general approach to the steady-state efficiency analysis of one degree of freedom (1-DOF) speed increasers with one or two inputs, and one or two outputs, applicable to wind, hydro and marine-current power generating systems. The mechanical power flow, and the efficiency of this type of complex speed increasers, are important issues in the design and development of new power-generating systems. It is revealed that speed increases, with in-parallel transmission of the mechanical power from the wind or water rotors to the electric generator, have better efficiency than serial transmissions, but their efficiency calculus is still a challenging problem, solved in the paper by applying the decomposition method of complex speed increasers into simpler component planetary gear sets. Therefore, kinematic, steady-state torque and efficiency equations are derived for a generic 1-DOF speed increasers with two inputs and two outputs, obtained by connecting in parallel two gear mechanisms. These equations allow any speed increaser to be analysed with two inputs and one output, with one input and two outputs, and with one input and one output. We discuss a novel design of a patent-pending planetary-gear speed increaser, equipped with a two-way clutch, which can operate (in combination with the pitch adjustment of the rotors blades) in four distinct configurations. It was found that the mechanical efficiency of this speed increaser in the steady-state regime is influenced by the interior kinematic ratios, the input-torque ratio and by the meshing efficiency of its individual gear pairs. The efficiency of counter-rotating dual-rotor systems was found to be the highest, followed by systems with counter-rotating electric generator, and both have higher efficiency than conventional systems with one rotor and one electric generator with fixed-stator.

Suggested Citation

  • Mircea Neagoe & Radu Saulescu & Codruta Jaliu & Petru A. Simionescu, 2020. "A Generalized Approach to the Steady-State Efficiency Analysis of Torque-Adding Transmissions Used in Renewable Energy Systems," Energies, MDPI, vol. 13(17), pages 1-18, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4568-:d:408451
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    References listed on IDEAS

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    1. Booker, J.D. & Mellor, P.H. & Wrobel, R. & Drury, D., 2010. "A compact, high efficiency contra-rotating generator suitable for wind turbines in the urban environment," Renewable Energy, Elsevier, vol. 35(9), pages 2027-2033.
    2. Hall, John F. & Mecklenborg, Christine A. & Chen, Dongmei & Pratap, Siddharth B., 2011. "Wind energy conversion with a variable-ratio gearbox: design and analysis," Renewable Energy, Elsevier, vol. 36(3), pages 1075-1080.
    3. Radu Saulescu & Mircea Neagoe & Codruta Jaliu, 2018. "Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems," Energies, MDPI, vol. 11(9), pages 1-33, August.
    4. Lee, Seungmin & Kim, Hogeon & Son, Eunkuk & Lee, Soogab, 2012. "Effects of design parameters on aerodynamic performance of a counter-rotating wind turbine," Renewable Energy, Elsevier, vol. 42(C), pages 140-144.
    5. Santoso, Surya & Le, Ha Thu, 2007. "Fundamental time–domain wind turbine models for wind power studies," Renewable Energy, Elsevier, vol. 32(14), pages 2436-2452.
    6. Mircea Neagoe & Radu Saulescu & Codruta Jaliu, 2019. "Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators," Energies, MDPI, vol. 12(9), pages 1-19, May.
    7. Farahani, E.M. & Hosseinzadeh, N. & Ektesabi, M., 2012. "Comparison of fault-ride-through capability of dual and single-rotor wind turbines," Renewable Energy, Elsevier, vol. 48(C), pages 473-481.
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    Cited by:

    1. Radu Saulescu & Mircea Neagoe & Codruta Jaliu & Olimpiu Munteanu, 2021. "A Comparative Performance Analysis of Counter-Rotating Dual-Rotor Wind Turbines with Speed-Adding Increasers," Energies, MDPI, vol. 14(9), pages 1-21, May.
    2. Chuhua Jiang & Xuedao Shu & Junhua Chen & Lingjie Bao & Hao Li, 2020. "Research on Performance Evaluation of Tidal Energy Turbine under Variable Velocity," Energies, MDPI, vol. 13(23), pages 1-14, November.

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