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Control Algorithm for Parallel Connected Offshore Wind Turbine Generators

Author

Listed:
  • Emir Omerdic

    (Faculty of Electrical Engineering, University of Tuzla, 75000 Tuzla, Bosnia and Herzegovina)

  • Jakub Osmic

    (Faculty of Electrical Engineering, University of Tuzla, 75000 Tuzla, Bosnia and Herzegovina)

  • Cathal O’Donnell

    (Centre for Robotics & Intelligent Systems (CRIS), Department of Electronics & Computer Engineering, University of Limerick, V94 T9PX Limerick, Ireland)

  • Edin Omerdic

    (Centre for Robotics & Intelligent Systems (CRIS), Department of Electronics & Computer Engineering, University of Limerick, V94 T9PX Limerick, Ireland)

Abstract

A control algorithm for Parallel Connected Offshore Wind Turbines with permanent magnet synchronous Generators (PCOWTG) is presented in this paper. The algorithm estimates the optimal collective speed of turbines based on the estimated mechanical power of wind turbines without direct measurement of wind speed. In the proposed topology of the wind farm, direct-drive Wind Turbine Generators (WTG) is connected to variable low-frequency AC Collection Grids (ACCG) without the use of individual power converters. The ACCG is connected to a variable low-frequency offshore AC transmission grid using a step-up transformer. In order to achieve optimum wind power extraction, the collective speed of the WTGs is controlled by a single onshore Back to Back converter (B2B). The voltage control system of the B2B converter adjusts voltage by keeping a constant Volt/Hz ratio, ensuring constant magnetic flux of electromagnetic devices regardless of changing system frequency. With the use of PI pitch compensators, wind power extraction for each wind turbine is limited within rated WTG power limits. Lack of load damping in offshore wind parks can result in oscillatory instability of PCOWTG. In this paper, damping torque is increased using P pitch controllers at each WTG that work in parallel with PI pitch compensators.

Suggested Citation

  • Emir Omerdic & Jakub Osmic & Cathal O’Donnell & Edin Omerdic, 2021. "Control Algorithm for Parallel Connected Offshore Wind Turbine Generators," Energies, MDPI, vol. 14(15), pages 1-28, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4670-:d:606619
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    References listed on IDEAS

    as
    1. Pican, E. & Omerdic, E. & Toal, D. & Leahy, M., 2011. "Direct interconnection of offshore electricity generators," Energy, Elsevier, vol. 36(3), pages 1543-1553.
    2. Sebastian Pfaffel & Stefan Faulstich & Kurt Rohrig, 2017. "Performance and Reliability of Wind Turbines: A Review," Energies, MDPI, vol. 10(11), pages 1-27, November.
    3. Meere, Ronan & Ruddy, Jonathan & McNamara, Paul & O'Donnell, Terence, 2017. "Variable AC transmission frequencies for offshore wind farm interconnection," Renewable Energy, Elsevier, vol. 103(C), pages 321-332.
    4. Pican, E. & Omerdic, E. & Toal, D. & Leahy, M., 2011. "Analysis of parallel connected synchronous generators in a novel offshore wind farm model," Energy, Elsevier, vol. 36(11), pages 6387-6397.
    5. Zheren Zhang & Yingjie Tang & Zheng Xu, 2021. "Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology," Energies, MDPI, vol. 14(8), pages 1-20, April.
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