access icon free Unitary power control strategy for low-power wind energy conversion system using active speed stall control for full-load regime

This study deals with the control of a low-power off-grid wind energy conversion system. As rotor blades are not pitchable, control is ensured by variable-speed operation in order to limit harvested power in high winds and to maximise it at low winds. Turbine power regulation is achieved through active speed stall control, which supposes operation at low rotational speed values. In this way, operation within admissible limits of rotational speed and torque is also ensured. A unique power controller is designed, with classical proportional–integral (PI) structure and switched parameters and references. An original solution for switching controller parameters so as to avoid local instability and preserve smooth transition between partial-load and full-load operating regimes is proposed. Switching is performed in an operating point where power controller output is sufficiently deep in saturation and the antiwindup structure is active. Guidelines for choosing this switching point are provided. This control structure does not require estimation of either wind speed or wind torque, or use of gain scheduling structures. The proposed approach is validated through experiments on a dedicated real-time simulator.

Inspec keywords: direct energy conversion; scheduling; wind turbines; PI control; power control; wind power plants; energy harvesting; control system synthesis; power generation control; angular velocity control; time-varying systems

Other keywords: power harvesting; switching controller parameter; off grid wind energy conversion system; variable speed operation; unitary power control strategy; unique power controller design; admissible rotational speed limits; admissible torque limits; proportional-integral structure; wind turbine power regulation; active speed stall control; full load operating regime; gain scheduling structures

Subjects: Control of electric power systems; Control system analysis and synthesis methods; Wind power plants; Energy harvesting; Power and energy control; Velocity, acceleration and rotation control; Time-varying control systems

References

    1. 1)
      • 13. Muljadi, E., Butterfield, C.P.: ‘Pitch-controlled variable-speed wind turbine generation’. Research Report NREL/CP-500-27143, Presented at the 1999 IEEE Industry Applications Society Annual Meeting Phoenix, Arizona, 3–7 October 1999.
    2. 2)
      • 8. Hoffmann, R.: ‘A comparison of control concepts for wind turbines in terms of energy capture’. PhD Thesis, Darmstadt University, 2002.
    3. 3)
      • 12. Vlad, C., Munteanu, I., Bratcu, A.I., Ceangă, E.: ‘Anticipative control of low-power wind energy conversion systems for optimal power regime’, Control Eng. Appl. Inf., 2009, 11, (4), pp. 2635.
    4. 4)
    5. 5)
    6. 6)
    7. 7)
    8. 8)
      • 13. Muljadi, E., Butterfield, C.P.: ‘Pitch-controlled variable-speed wind turbine generation’. Research Report NREL/CP-500-27143, Presented at the 1999 IEEE Industry Applications Society Annual Meeting Phoenix, Arizona, 3–7 October 1999.
    9. 9)
      • 6. Bianchi, F., De Battista, H., Mantz, R.J.: ‘Wind turbine control systems – principles, modelling and gain scheduling design’ (Springer, London, 2006).
    10. 10)
      • 19. Goodfellow, D.: ‘Variable speed operation of wind turbines’. Ph.D. Thesis, University of Leicester, October 1986.
    11. 11)
      • 21. Neammanee, B., Sirisumrannukul, S., Chatratana, S.: ‘Control strategies for variable-speed fixed-pitch wind turbines’, in Muyeen, S.M. (ed.): ‘Wind power’ (InTech, 2010).
    12. 12)
    13. 13)
      • 11. Polinder, H., Bang, D., van Rooij, R.P.J.O.M., McDonald, A.S., Mueller, M.A.: ‘10 MW wind turbine direct-drive generator design with pitch or active speed stall control’. Proc. IEEE Int. Electric Machines and Drives Conf., Antalya, Turkey, 3–5 May 2007.
    14. 14)
    15. 15)
    16. 16)
      • 23. Muljadi, E., Pierce, K., Migliore, P.: ‘A conservative control strategy for variable-speed stall-regulated wind turbines’. Research Report NREL/CP-500-24791, February 2000, Presented at the 19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium, Reno, Nevada, 10–13 January 2000.
    17. 17)
    18. 18)
      • 4. Munteanu, I., Bratcu, A.I., Cutululis, N.A., Ceangă, E.: ‘Optimal control of wind energy systems – towards a global approach’ (Springer, London, 2008).
    19. 19)
      • 16. Yundong, M., Junqi, W., Hong, Y., Zurong, H.: ‘Research and design of fixed-pitch non-grid-connected wind power system’. Int. Conf. Renewable Energies and Power Quality (ICREPQ'11), Las Palmas de Gran Canaria, Spain, 13–15 April 2011.
    20. 20)
      • 14. Rosmin, N., Watson, S.J., Thompson, M.: ‘Power limitation at high wind speed for a variable speed fixed pitch wind turbine using close-loop scalar control’. Int. Conf. Renewable Energies and Power Quality (ICREPQ'10), Granada, Spain, 23–25 March 2010.
    21. 21)
      • 17. Boukhezzar, B., Siguerdidjane, H.: ‘Nonlinear control of variable speed wind turbines for power regulation’. Proc. 2005 IEEE Conf. Control Applications, Toronto, Canada, 28–31 August 2005.
    22. 22)
      • 15. Serban, I., Marinescu, C.: ‘A sensorless control method for variable-speed small wind turbines’, Renew. Energy, 2012, 43, (2012), pp. 256266.
    23. 23)
      • 29. Munteanu, I., Bratcu, A.I., Ceangă, E.: ‘Low-power wind energy conversion systems: generation configurations and control objectives’, in Pardalos, P., Rebennack, S., Pereira, M.V.F., Iliadis, N.A., Pappu, V. (eds.): ‘Handbook of wind power systems’ (Springer, 2014).
    24. 24)
    25. 25)
      • 20. Bourlis, D.: ‘A complete control scheme for variable speed stall regulated wind turbines’, in Carriveau, R. (ed.): ‘Fundamental and advanced topics in wind power’ (InTech, 2011).
    26. 26)
      • 9. Vihriälä, H.: ‘Control of variable speed wind turbines’. PhD Thesis, Tampere University of Technology, 2002.
    27. 27)
      • 10. Bang, D., Polinder, H., Shrestha, G., Ferreira, J.A., van Rooij, R.P.J.O.M.: ‘New active speed stall control compared to pitch control for direct-drive wind turbines’. Proc. EWEC (European Wind Energy Conference & Exhibition), Milan, Italy, 7–10 May 2007.
    28. 28)
      • 2. Burton, T., Sharpe, D., Jenkins, N., Bossanyi, E.: ‘Wind energy handbook’ (Wiley, New-York, 2001).
    29. 29)
      • 22. Muljadi, E., Pierce, K., Migliore, P.: ‘Control strategy for variable-speed, stall-regulated wind turbines’. Research Report NREL, Presented at American Control Conference, Philadelphia, 24–26 June 1998.
    30. 30)
      • 26. Zurong, H., Junqi, W., Yundong, M., Xing, Y.: ‘Research on speed control system for fixed-pitch wind turbine based on disturbance observer’. World Non-Grid-Connected Wind Power and Energy Conference (WNWEC ‘09), 2009, pp. 15.
    31. 31)
      • 18. Mutschler, P., Hagenkort, B., Jöckel, S.: ‘Synopsis of control method for variable speed stall controlled wind turbine’. Proc. EWEC, 1997.
    32. 32)
    33. 33)
      • 24. Kirk, G., Pierce, K., Migliore, P.G.: ‘Maximizing energy capture of fixed-pitch variable-speed wind turbines’. Research Report NREL/CP-500-27551, Presented at the 38th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, 10–13 January 2000.
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