Ahmad Muhyiddin Yusof
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Ahmad Muhyiddin Yusof
Official Name
Ahmad Muhyiddin, Yusof
Alternative Name
Yusof, Ahmad Muhyiddin
Yusof, Ahmad Muhyiddin Bin
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Scopus Author ID
58332127000

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  • Publication
    Performance Analysis of Unipolar SPWM Inverter: Resistive load and Inductive load
    ( 2020-12-18)
    Muhammad Zaid Aihsan
    ;
    Ahmad Muhyiddin Yusof
    ;
    Nur Irwany Ahmad
    ;
    Mohd Saifizi Saidon
    ;
    Habibah Mokhtaruddin
    ;
    Diyya Hidayah Abdul Rahman
    ;
    Wan Azani Wan Mustafa
    This paper presents the performance analysis of the Unipolar SPWM Inverter for the resistive and inductive load testing. The common criteria reported in various technical papers where the resistive load will produce a unity power factor correction and lagging power factor behaviour for inductive load. This paper is to demonstrate the performance of both loads that are tested to the single phase Unipolar SPWM inverter under the modulation ratio of 0.8. The performances will be covered in term of the waveform behavior and THDv performance. The project are carried out through the simulation using PSIM software and real implementation to the real hardware. The selection of filter for this paper is the low pass passive LC filter.
      9  42
  • Publication
    Lightning generated electric field over land and sea at northern region of peninsular malaysia: Measuring setup
    ( 2020-09-01)
    Ahmad Muhyiddin Yusof
    ;
    Abdul-Malek Z.
    ;
    Wooi Chin Leong
    Lightning electric fields can be characterized based on its origins which include the preliminary breakdown, stepped leader, return stroke, subsequent return stroke, dart leader, dart-stepped leader, narrow bipolar pulses, cloud activity between strokes, regular pulse trains, K and M changes, and chaotic pulse trains. The aim of this work is to describe a lightning measuring setup suitable for characterizing lightning electric fields and their propagation when the measuring sensors are close to the sea. A location close to the sea in Northern Malaysia was identified and prepared for the study. Parallel plate and vertical whip antennas are used as the main sensors, which are connected to a high-speed digital storage oscilloscope through customized analog filter buffer circuits. Noise-distortion effects in the recorded data are filtered using MATLAB computer simulation before further analyses are carried out. The 1-D wavelet technique is used in the signal denoising process. Preliminary results show that the installed setup and denoising method is adequate and potentially efficient for the pre-processing of lightning electric field signals, and hence can be used for the detailed characterization study including the effects of sea on lightning characteristics and propagation.
      3  30