02095nam a22001097a 4500100007300000245008900073260002700162300000900189500171300198700004101911856003301952  aMuzafar Hussain Lashria17MPE14aSupervisor- Dr .Javed Ahmed Laghari  aA Dynamic Under Frequency Load Shedding Scheme For the Prevention of Power Blackouts  aNawabshahbQuestc2021  a43p.  a
ABSTRACT
Electric power system is always subjected to different types of disturbances due to overload, tripping of generators, fault occur at any section of power system. Due to these disturbances, the system frequency will change, and the power system becomes unstable which can result in a major blackout if not immediately restored. To make stability in the frequency, typically conventional under-frequency load shedding (UFLS) method is widely used. However, these have the issue of not calculating the power imbalance and leading to un-optimal load  shedding. The consequence might be excessive shedding of loads, that would impact the power  system's efficiency, or small shedding of loads, leading towards the interruption of  complete  system.  To address this issue, this thesis proposes a dynamic under frequency  load  shedding scheme to make sure the power system is functioning secure and effective in the event of significant  disruptions.  The proposed  dynamic UFLS  scheme  is performed  based on frequency and its rate of change with power swing equation.

The efficacy and robustness have been explored for this system in various cases of generators operating in the test system of IEEE 9 Bus. The frequency response for both conventional and dynamic UFLS schemes is compared for various generator tripping cases. It has been found that dynamic UFLS scheme provides more optimal results than the conventional scheme in terms of frequency overshoot, frequency undershoot, and the loads which are to be shed. Furthermore, this study proves that dynamic UFLS scheme is efficient and more reliable in the prevention of power blackouts in power system compared  to conventional UFLS  scheme.
  aDepartment of Electrical Engineering  uhttps://tinyurl.com/4s46t35f