Vittal, Eknath

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Vittal, Eknath
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Vittal, Eknath

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  • Publication
    Varying penetration ratios of wind turbine technologies for voltage and frequency stability
    (IEEE, 2008-07)
    Vittal, Eknath 
    ;
    Keane, Andrew 
    ;
    O'Malley, Mark 
    This paper examines the ability of a power system to accommodate wind generation with varying ratios of doubly fed induction generator and fixed speed induction generator turbines from both static and dynamic aspects. By controlling the ratio between the two types of turbines, voltage stability is maintained for steady-state conditions for a large range of varying wind speeds. Using the ratio determined from the static analysis, the dynamic analysis explores the voltage and frequency characteristics of the system under contingency conditions. An initial analysis was carried out on the IEEE 30 bus test system. The results of this analysis are presented in this paper and detail how by varying the ratio of the turbine types the frequency stability and voltage stability can be improved.
      1451Scopus© Citations 38
  • Publication
    A small - signal stability analysis of DFIG wind generation
    (Energynautics, 2009-10)
    Vittal, Eknath 
    ;
    O'Malley, Mark 
    ;
    Keane, Andrew 
    This paper examines the small-signal stability impacts of high penetrations of doubly-fed induction generator (DFIG) wind turbines on power systems. It provides a basic overview of small-signal stability concepts and then examines the response of DFIG generation to two local contingency event. Using the New England 39 bus test system, this paper will demonstrate the stability implications of DFIG turbines utilizing terminal voltage control and fixed power factor control in response to reactive and active power loss events. By implementing terminal voltage control strategies in DFIG wind turbines, system stability is improved and allows for increased levels of wind penetration levels while maintaining a high level of system security.
      2560
  • Publication
    Impact of wind turbine control strategies on voltage performance
    (IEEE, 2009-07)
    Vittal, Eknath 
    ;
    O'Malley, Mark 
    ;
    Keane, Andrew 
    This study examines the 2013 Irish electricity network and its ability to accommodate large levels of wind generation while maintaining appropriate voltage levels across the system. The network provides a fully functional test system that is suitable for large scale power flow and dynamic simulations. In the next decade, wind generation is expected to constitute large percentage of the country’s new renewable generation portfolio due to the rich wind resource available in Ireland. As wind penetration grows, larger levels of conventional generation will be displaced and there will be an increased need to provide both voltage and frequency stability support. Many wind turbines have the capability to perform certain mitigation tasks such as reactive power support; in particular, this study will examine the wind turbine’s ability to provide terminal voltage control in order to improve the system’s voltage performance. This will be achieved using steady-state power flow analysis with historical loading patterns while taking into account the inherent variability of the wind resource. It will show that increased application of terminal voltage control strategies will allow for more robust voltages both locally and systemically.
      1683Scopus© Citations 9