Muhammad Izuan Fahmi Romli
Thumbnail Image
Preferred name
Muhammad Izuan Fahmi Romli
Official Name
Muhammad Izuan Fahmi, Romli
Alternative Name
Fahmi, M. I.
Izuan Fahmi Romli, Muhammad
Fahmi, Muhamad Izuan
Fahmi, M. Izuan
Romli, Muhamad Izuan Fahim
Fahmi, Muhammad Izuan
Romli, Muhammad Izuan Fahmi
Main Affiliation
Scopus Author ID
56600298900
Researcher ID
AAB-1896-2020

Research Output
Now showing 1 - 3 of 3
  • Publication
    PCB Rogowski coil sensor by using saw blade pattern for arcing fault detection
    (IOP Publishing, 2023)
    Kamarul Aizat Abdul Khalid
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Ayob Nazmy Nanyan
    ;
    Zul Hasrizal Bohari
    Rogowski is a special current transformer and has been categorised as a low-power stand-alone current sensor. This sensor is designed by using a Saw blade pattern with 50 turns and 100 turns. This number of turns will impact the increment of the sensitivity of the sensor. Rogowski coil is used for measuring the alternating current (AC) and high-speed current pulses. The PCB Rogowski Coil will detect the arcing fault that design with AutoCAD software after that import to CST software. An arc is created when the electrical current jumps the gap between two conductive materials. The most common causes of arcs include worn contacts in electrical equipment, damage to insulation, break in a cable and loose connections. In order to reduce the arc fault risk, the arc fault interrupter (AFI) technology and arc fault detectors (AFD) have been developed. However, these devices are most suitable for domestic application or low voltage (LV). This paper proposed a simulation using AutoCAD and CST software to design a Rogowski coil and the Rogowski Coil sensor will be tested by using CST software in terms of radiation pattern. The biggest radiation pattern in red colour is the saw blade pattern in 100 turns at 2 KHz frequency, the radiation pattern covering entire sensor area compared with other radiation patterns with other frequency. The main lobe magnitude for 2 KHz frequency is 46.8 dB, main lobe direction is 180 deg, angular width is 153.4 deg and the side lobe level is zero. This is the best number of turn and frequency compared to 50 turn saw blade sensor.
  • Publication
    Flexible sector detector-based mismatch supply voltage in direct torque control doubly fed induction machine: an experimental validation
    (Elsevier, 2023)
    Muhammad Zaid Aihsan
    ;
    Auzani Jidin
    ;
    Muhammad Mokhzaini Azizan
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Khairunnisa Hasikin
    Direct Torque Control (DTC) of Induction Motors (IMs) is popular in motor drive applications because of its robust and simple control structure. The IM winding can be controlled on both sides using dual inverter technique which more effective for Electric Vehicle (EV) with a greater number of voltage vectors. However, the battery performance of the dual inverter will deteriorate unevenly on both sides, resulting in fluctuating voltages for the EV system. This will lead to the generation of distorted stator currents and a significant droop in the stator flux, which in turn can increase the total harmonic distortion (THD) in the system. Additionally, the performance of torque may not be able to regulate effectively. This paper examines the effect of unstable voltage on voltage vector mapping performance with tilted angles and proposes new sector definitions based on voltage ratio conditions. Moreover, the proposed sector for each predefined voltage ratio is tested under three-speed conditions. The proposed technique effectiveness is validated through hardware experiments using a dSPACE 1104 controller and retuning the stator current for proper waveform. This approach improves the stator current waveform, improves stator flux droop, enhances torque regulation and minimizes the THD in the DTC system.
      14  3
  • Publication
    Improvement of based sector and comparison speed and electromagnetic torque of direct torque control
    (Semarak Ilmu Publishing, 2024-08)
    Muhamad Akmal Aazmi
    ;
    Shamshul Bahar Yaakob
    ;
    Muhammad Izuan Fahmi Romli
    ;
    Muhammad Zaid Aihsan
    Direct torque control is one type of vector control used to operate an induction motor. Efficient control rules for induction motor drives offer a great chance to save energy. In comparison to DC batteries, supercapacitor (SC) technology is commonly recognised as one of the most promising and energy-efficient technologies for next-generation energy storage systems. Rotating equipment generates vibration, which causes rotor dynamic. Battery applications also provide high torque current for induction motor start-up. The goal of these investigations and analyses is to improve the performance of the electrical device system for six sector and twelve sector direct torque control methods employing DC battery and supercapacitor. The direct torque control model is separated into seven sections: input energy storage, voltage source inverter, flux and torque estimate, sector detection, flux and torque controller, vector selection table, and induction motor. The paper focuses on the improvement of based sector for six sector and twelve sector technique of induction motor in MATLAB/Simulink simulation framework by employing different energy storage (supercapacitor and DC battery). The output of the system designed in MATLAB Simulink has been examined in terms of rotor speed and electromagnetic torque. In terms of rotor speed, the twelve-sector approach requires 0.04 second speed transition to reach steady state response, but the six-sector method requires 0.06 second when a load disturbance is added for DC battery and supercapacitor. When compared to the six-sector approach for DC battery and supercapacitor, the electromagnetic torque that employs the twelve-sector method provides more smoothly following the load torque. When a load disturbance is applied, the electromagnetic torque in the twelve-sector approach produces a spiky torque of around 15.5N, whereas the electromagnetic torque in the six-sector method produces 18N. In terms of electromagnetic torque, the usage of a supercapacitor generates 15N, whereas the use of a battery provides around 50N for the six sector and twelve sector methods.