Nur Sabrina Md Noorpi
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Preferred name
Nur Sabrina Md Noorpi
Official Name
Nur Sabrina, Md Noorpi
Alternative Name
Noorpi, Nur Sabrina Md
Noorpi, Nur S.
Noorpi, N. S.M.
Noorpi, Nur Sabrina
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Scopus Author ID
55560659300

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  • Publication
    Mitigation on Sympathetic Inrush Current Phenomena between Parallel-Connected Transformers using PSCAD/EMTDC
    ( 2022-01-01)
    Nadhirah N.F.
    ;
    Halim H.A.
    ;
    Hussin N.
    ;
    Amirruddin M.
    ;
    Nur Sabrina Md Noorpi
    In renewable energy sources, one of the most rapidly developing is wind energy. Wind turbine transformers are connected between the wind turbines and the distribution grid. Transformers have accessibility to play as key part in the overall power system. The magnetization of a wind-turbine transformer is frequently related with the inrush current phenomena. Magnetising inrush current perform as a start-up current which is develops in a transformer once it is turned on for the first times. The switched-on transformer is not only giving effects to the inrush current but it also had a significant impact on the parallel-connected transformers. This phenomenon called as sympathetic inrush current whereas it occurs once the transformer is turned on in a circuit while having another transformer that was previously energized. During the energization process, it has an unexpected saturation and once the transformer is saturated, transients develop, resulting in mal-operation of the protective relay and harmonic over-voltages. The magnitude and duration of the magnetising inrush current are dramatically changes when the phenomenon of sympathetic is occurred. In this research, the PSCAD software is utilized to develop a sympathetic inrush model and obtain the simulation results. According to simulation results, the proposed technique may efficiently identify sympathetic inrush. This paper examines the sympathetic inrush current phenomenon, as well as the factors that influence it and how to mitigate it.
  • Publication
    ADMM-based optimum power flow in nested microgrids
    ( 2020-11-01)
    Nur Sabrina Md Noorpi
    ;
    Aprilia E.
    ;
    Zhang, Wang
    ;
    Meng K.
    Nested microgrids is an emerging configuration of microgrids where one microgrid can operate as part of a bigger microgrid to ensure supply and increase reliability. Each microgrid contains dispatchable and non-dispatchable distributed generators (DGs) from renewable energy sources (RES), and loads so it can be optimized to be self-sufficient. Yet, it is given the option to buy power from the upper level to meet its deficit or sell its surplus of power to the lower level. This paper proposed a method to optimize DGs output power and the power trading between upper and lower microgrids with the distributed optimization technique. Using the alternating direction method of multipliers (ADMM) algorithm, each level is optimized in parallel for a day-ahead energy management system (EMS). Then the boundary variables are checked until convergence criteria are met. A case study was executed on IEEE 33-bus system to evaluate the performance of the proposed technique.