Control of Variable Speed Wind Turbines in Islanded Mode of Operation

Nat. Tech. Univ. of Athens, Athens
IEEE Transactions on Energy Conversion (Impact Factor: 2.43). 07/2008; DOI: 10.1109/TEC.2008.921553
Source: IEEE Xplore

ABSTRACT Nowadays, technology evolution and deregulation of the electric utility industry enable distributed generation (DG) to play an increasing role in locally satisfying the expanding power demand. In this paper, the islanded operation of an electrical grid supplied by wind turbines, which belong to the most rapidly expanding DG technologies, is studied. Control strategies for power electronics interface of variable speed wind turbines, ensuring fast control of frequency and voltage, are proposed.

  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a method for controlling the output power of a permanent magnet synchronous generator (PMSG) in strong wind conditions. Currently, most of wind turbines are stopped and disconnected from the power system when wind speeds reaches more then 25 m/s. This will lead to detrimental power and voltage fluctuations in the power system. To overcome this problem, output power, pitch angle and rotation speed command values are designated. A novel method, which includes pitch angle and rotation speed control is proposed. Simulation results show that the wind turbine can generate stable power during strong wind conditions.
    Industrial Electronics (ISIE), 2013 IEEE International Symposium on; 01/2013
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper an extensive literature review on load–frequency control (LFC) problem in power system has been highlighted. The various configuration of power system models and control techniques/strategies that concerns to LFC issues have been addressed in conventional as well as distribution generation-based power systems. Further, investigations on LFC challenges incorporating storage devices BESS/SMES, FACTS devices, wind–diesel and PV systems etc have been discussed too.
    Renewable and Sustainable Energy Reviews 01/2013; 25:318–334. · 5.63 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents an output power smoothing method by a simple coordinated control of DC-link voltage and pitch angle of a wind energy conversion system (WECS) with a permanent magnet synchronous generator (PMSG). The WECS adopts an AC-DC-AC converter system with voltage-source converters (VSC). The DC-link voltage command is determined according to output power fluctuations of the PMSG. The output power fluctuationsin low- and high-frequency domains are smoothed by the pitch angle control of the WECS, and the DC-link voltage control, respectively. By using the proposed method, the wind turbine blade stress is mitigated as the pitch action in high-frequency domain is reduced. In addition, the DC-link capacitor size is reduced without the charge/discharge action in low-frequency domain. A chopper circuit is used in the DC-link circuit for stable operation of the WECS under-line fault. Effectiveness of the proposed method is verified by the numerical simulations.
    IEEE Transactions on Energy Conversion 07/2011; · 2.43 Impact Factor