Rather, Zakir H.

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Rather, Zakir H.
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Rather, Zakir H.

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  • Publication
    Impact of voltage dip induced delayed active power recovery on wind integrated power systems
    (Elsevier, 2017-04)
    Rather, Zakir H. 
    ;
    Flynn, Damian 
    Installed wind power capacity is increasing rapidly in many power systems around the world, with challenging penetration targets set at national, and/or regional level. Wind power, particularly at higher penetration levels, introduces various grid issues, with frequency and voltage stability being particularly critical concerns. Voltage dip induced frequency stability following a network fault in such systems is one potential risk that has so far received limited attention by the research community. With state of the art modelling, the potential impact of a delayed active power recovery from wind generation following a network fault induced voltage dip is investigated. The subsequent voltage oscillations introduced by wind turbines, exacerbating frequency stability, are also examined. Analysis is carried out for a wide range of wind penetration levels and system scenarios, with the results demonstrated on the New England benchmark system.
      643Scopus© Citations 26
  • Publication
    Technical impacts of high penetration levels of wind power on power system stability
    (Wiley, 2016-06-06)
    Flynn, Damian 
    ;
    Rather, Zakir H. 
    ;
    Ardal, A. 
    ;
    et al. 
    With increasing penetrations of wind generation, based on power-electronic converters, power systems are transitioning away from well-understood synchronous generator-based systems, with growing implications for their stability. Issues of concern will vary with system size, wind penetration level, geographical distribution and turbine type, network topology, electricity market structure, unit commitment procedures, and other factors. However, variable-speed wind turbines, both onshore and connected offshore through DC grids, offer many control opportunities to either replace or enhance existing capabilities. Achieving a complete understanding of future stability issues, and ensuring the effectiveness of new measures and policies, is an iterative procedure involving portfolio development and flexibility assessment, generation cost simulations, load flow, and security analysis, in addition to the stability analysis itself, while being supported by field demonstrations and real-world model validation.
    Scopus© Citations 69  1544
  • Publication
    Impact of large-scale demand side management on system frequency policy - a case study
    (IEEE, 2015-07-02)
    Qazi, Hassan Wajahat 
    ;
    Rather, Zakir H. 
    ;
    Flynn, Damian 
    Demand side response (DSR) has gained significant interest due to the time-varying and uncertain nature of renewable energy, and the challenges associated with integrating renewable technologies into power systems. DSR is considered as a fundamental component of the emerging smart grid paradigm and is seen as a potential means to achieve higher renewable targets across the globe. It is, therefore, imperative to explore the potential implications of wide-scale DSR on system operation. In particular, the impact of large-scale coordinated load switching on potential operational limits, while considering different DSR-based magnitudes and ramp rates, is considered here. The All Ireland System (AIS) projected for the year 2020, and characterised by a significant penetration of wind power has been used as a test system in the presented research study.
      267