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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Norjulia Mohamad Nordin
Universiti Teknologi Malaysia
Control & Systems Engineering Electrical & Electronics Engineering

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The performances of partial shading adjuster for improving photovoltaic emulator Razman Ayop; Chee Wei Tan; Syed Norazizul Syed Nasir; Mohd Zaki Daud; Lau Kwan Yiew; Norjulia Mohamad Nordin; Abba Lawan Bukar
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 13, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v13.i1.pp528-536

Abstract

A photovoltaic (PV) emulator (PVE) is essential equipment for the research and diagnostic of PV generation. It is a convenient, highly efficient, and low-cost approach when compared to controllable light sources. Nonetheless, the implementation of the partial shading capability in a PVE is highly limited in terms of efficiency, computation burned, number of power converters, and flexibility to change in the ambient condition. This paper proposes a partial shading adjuster for a PVE that can overcome the aforementioned limitations. The adjuster is applicable to the conventional PVE since it is based on an algorithm that can be added to the controller of the PVE. By adding the adjuster, the conventional PVE can emulate partial shading. The partial shading adjuster is added into a PVE that uses the direct referencing control strategy with the buck controller regulated by the proportional-integral controller. The results show that the PVE maintains its accuracy and produces a stable output voltage and current during the load changes when the adjuster is added. In conclusion, the proposed partial shading adjuster able to improve th
Constant Frequency Torque Controller for DTC with Multilevel Inverter of Induction Machines Norjulia Mohamad Nordin; Naziha Ahmad Azli; Nik Rumzi Nik Idris; Nur Huda Ramlan; Tole Sutikno
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 1: March 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v7.i1.pp28-44

Abstract

Direct Torque Control using multilevel inverter (DTC-MLI) with hysteresis controller suffers from high torque and flux ripple and variable switching frequency. In this paper, a constant frequency torque controller is proposed to enhance the DTC-MLI performance. The operational concepts of the constant switching frequency torque controller of a DTC-MLI system followed by the simulation results and analysis are presented. The proposed system significantly improves the DTC drive in terms of dynamic performance, smaller torque and flux ripple, and retain a constant switching frequency.
Implementation of finite control set-predictive torque control based on the dSpace DS1104 controller Rozana Alik; Nik Rumzi Nik Idris; Norjulia Mohamad Nordin; Tole Sutikno
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 17, No 1: March 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v17.i1.pp155-167

Abstract

Finite control set-predictive torque control (FCS-PTC) has emerged as a popular control method for induction motors (IMs) over the past decade. This paper provides a detailed hardware implementation of FCS-PTC with a constant weighting factor (WF) on 186 W of IM. The FCS-PTC is implemented using the DS1104 controller board programmed using C code. A comprehensive analysis of flux, torque, and the total harmonic distortion (THD) of the stator current is conducted and presented to establish a relationship between the WF and drive performance. The experimental results indicate that a higher WF results in improved performance in flux and THD current, but a poorer torque response. Conversely, a lower WF improves torque performance but sacrifices the flux and THD current. The analysis outcome will hopefully provide some guidelines for developing the WF selection techniques.
Adaptive internal model control-proportional integral for robust control of three-phase active front-end rectifiers Azizah Abdul Razak; Norjulia Mohamad Nordin; Razman Ayop; Hazlina Selamat; Abobaker Kikki Abobaker; Nik Rumzi Nik Idris; Tole Sutikno
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 17, No 3: September 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v17.i3.pp1794-1807

Abstract

Three-phase active front-end (AFE) rectifiers are widely deployed in motor drives, electric vehicle chargers, and grid-connected renewable energy systems, where precise DC-link voltage regulation is essential for stable converter operation. In practice, DC-link capacitance degrades over time, and load profiles vary dynamically, both degrading the DC-link voltage regulation performance. Conventional proportional-integral (PI) outer voltage controllers are designed based on nominal operating conditions, with limited stability margins resulting in sluggish or oscillatory DC-link voltage responses under significant load and parameter variations. This paper proposes an adaptive internal model control-proportional integral (AIMC-PI) outer voltage loop controller for a three-phase AFE rectifier. It extends the conventional IMC-PI structure by incorporating an active damping term, an internal feedforward gain, a reference filter, and a Lyapunov-based adaptation law that updates the embedded plant model and IMC filter time constant online ensuring closed-loop stability and bounded tracking error. Simulation results show that AIMC-PI achieves a faster dynamic response than PI and performance comparable to IMC-PI and linear active disturbance rejection control (LADRC) under nominal conditions. As DC-link capacitance degrades to 0.5C, AIMC-PI maintains a well-damped DC-link voltage, whereas LADRC exhibits noticeable oscillations. Experimentally, AIMC-PI successfully eliminates the AC-supply current and DC-link voltage ripples present in fixed-λ IMC-PI.
Co-Authors Abba Lawan Bukar Abobaker Kikki Abobaker Azizah Abdul Razak Chee Wei Tan Hazlina Selamat Lau Kwan Yiew Mohd Zaki Daud Naziha Ahmad Azli Nik Rumzi Nik Idris Nur Huda Ramlan Razman Ayop Rozana Alik Syed Norazizul Syed Nasir Tole Sutikno