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Publications (3)0 Total impact

  • S. El Itani, G. Joos
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    ABSTRACT: The paper examines two major implementations of inertial response in variable-speed wind turbine generators. Through time-domain simulations, these supplementary loops are compared based on their impact on grid frequency and the wind plant. Testing is performed on an isolated, hydrodominated power system benchmark, to which a DFIG-based wind plant is connected. The results show that when these implementations are combined, with proper coordination, the resulting controller is capable of superior performance.
    Electrical and Computer Engineering (CCECE), 2011 24th Canadian Conference on; 06/2011
  • Samer El Itani, Geza Joos
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    ABSTRACT: Variable-speed wind generators are decoupled from the grid frequency by their power electronic interfaces. These generators do not naturally exhibit inertial response or any other form of frequency support in generation deficit situations. This study assesses and quantifies the capability of wind turbines with doubly-fed induction generators for emulating the inertial response of conventional generators by providing temporary extra active power on top of the available production. Special attention is given to the underproduction phase that follows overproduction due to rotor speed recovery. Results show that the inertial contribution strongly depends on the wind turbine operating conditions and the allowed underproduction level.
    01/2011;
  • S. El Itani, U.D. Annakkage, G. Joos
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    ABSTRACT: The increasing penetration of modern wind plants may cause primary frequency regulation to fall below acceptable levels, especially in isolated grids. This paper investigates the contribution of variable speed wind generators to short-term frequency support. First, the extractable inertial power from a DFIG wind turbine is quantified. Based on that, a controller is designed to transiently release part of the stored kinetic energy in the rotating masses. This can be very helpful in the critical few seconds following a load-generation mismatch. Through time-domain simulations, performance of the proposed controller is examined against earlier implementations of inertial response. Results show that the proposed controller is effective in arresting the initial frequency dip and capable of bringing together the advantages of earlier implementations for better integration of wind generators.
    Power and Energy Society General Meeting, 2011 IEEE; 01/2011