Vittal, Eknath

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Vittal, Eknath
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Vittal, Eknath

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  • Publication
    A steady-state voltage stability analysis of power systems with high penetrations of wind
    (IEEE, 2010-02)
    Vittal, Eknath 
    ;
    O'Malley, Mark 
    ;
    Keane, Andrew 
    As wind generation begins to contribute significantly to power systems, the need arises to assess the impact of this new source of variable generation on the stability of the system. This work provides a detailed methodology to assess the impact of wind generation on the voltage stability of a power system. It will also demonstrate the value of using time-series AC power flow analysis techniques in assessing the behavior of a power system. Traditional methods are insufficient in describing the nature of wind for steady-state analyses and as such a new methodology is presented to address this issue. Using this methodology, this paper will show how the voltage stability margin of the power system can be increased through the proper implementation of voltage control strategies in wind turbines.
      4117Scopus© Citations 247
  • Publication
    Rotor angle stability with high penetrations of wind generation
    (IEEE, 2012-02)
    Vittal, Eknath 
    ;
    O'Malley, Mark 
    ;
    Keane, Andrew 
    This paper explores the relationship between wind generation, particularly the control of reactive power from variable speed wind turbine generators, and the rotor angle stability of the conventional synchronous generators in the system. Rotor angle stability is a dynamic phenomenon generally associated with changes in active power flows that create angular separation between synchronous units in the system. With larger penetrations of wind generation being introduced into power systems, there will be large flows of active power from asynchronous generation in the system. These asynchronous active power flows can aid in maintaining the rotor angle stability of the system. However, the manner in which wind generation injects reactive power into the system can be critical in maintaining angular stability of the synchronous units. Utilizing wind generation to control voltage and reactive power in the system can ease the reactive power burden on synchronous generators, and minimize angular separation in the system following a contingency event and can provide a significant level of support which will become increasingly important in future power systems.
      3633Scopus© Citations 213
  • Publication
    Enhanced utilization of voltage control resources with distributed generation
    (IEEE, 2011-02)
    Keane, Andrew 
    ;
    Ochoa, Luis 
    ;
    Vittal, Eknath 
    ;
    Dent, Chris 
    ;
    Harrison, Gareth 
    Distributed Generation (DG) is increasing in penetration on power systems across the world. In rural areas, voltage rise limits the permissible penetration levels of DG. Another increasingly important issue is the impact on transmission system voltages of DG reactive power demand. Here, a passive solution is proposed to reduce the impact on the transmission system voltages and overcome the distribution voltage rise barrier such that more DG can connect. The fixed power factors of the generators and the tap setting of the transmission transformer are determined by a linear programming formulation. The method is tested on a sample section of radial distribution network and on a model of the all island Irish transmission system illustrating that enhanced passive utilisation of voltage control resources can deliver many of the benefits of active management without any of the expense or perceived risk, while also satisfying the conflicting objectives of the transmission system operator.
      1350Scopus© Citations 177