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Articles by N.A. Rahim
Total Records ( 3 ) for N.A. Rahim
  N.A. Rahim and Z. Islam
  Problem statement: The design and implementation of a sinusoidal Pulse-Width Modulation (PWM) generator for a single-phase hybrid power filter is presented. Approach: The PWM was developed in an Altera® Flex 10 K Field Programmable Gate Array (FPGA) and the modulation index was selected by calculating the DC bus voltage of the active filter through a digital controller, by Proportional-Integral-Derivative (PID) technique. Results: Experiment results showed the proposed active power filter topology to be capable of compensating the load current and the voltage harmonic, up to IEC limit. Conclusion: The implemented PWM generator using an FPGA required less memory usage while providing flexible PWM patterns whether same phase, lagging, or leading, the reference voltage signal.
  R. Omar , N.A. Rahim and A. Ahmad
  Problem statement: Voltage disturbances are the most common power quality problem due to the increased use of a large numbers of sophisticated electronic equipment in industrial distribution system. The voltage disturbances such as voltage sags, swells, harmonics, unbalance and flickers. High quality in the power supply is needed, since failures due to such disturbances usually have a high impact on production cost. There are many different solutions to compensate voltage disturbances but the use of a DVR is considered to be the most cost effective method. The objective of this study is to propose a new topology of a DVR in order to mitigate voltage swells using a powerful power custom device namely the Dynamic Voltage Restorer (DVR). Approach: New configuration of a DVR with an improvement of a controller based on direct-quadrature-zero method has been introduced to compensate voltage swells in the network. Results: The effectiveness of the DVR with its controller were verify using Matlab/Simulink’s SimPower Toolbox and then implemented using 5KVA DVR experimental setup. Simulations and experimental results demonstrate the effective dynamic performance of the proposed configuration. Conclusion: The implimentation of the proposed DVR validate the capabilities in mitigating of voltage swells effectiveness.During voltage swells, the DVR injects an appropriate voltage to maintain the load voltage at its nominal value.
  M. Azri , M.H. Bahrom , N.H.A. Khanipah , Z. Ibrahim , N.A. Rahim and S.R.S. Raihan
  This study presents the optimization of parameter operation in (PEMFC) Proton Exchange of Fuel cell using the electrical model and the mathematical model. The parameters of the fuel cell are hard to be determine since, the developer did not provides their parameter in details. The modelling of thermodynamic mathematical model and the electrical model is model based on a dynamic model and both is modeled using Matlab/Simulink simulation software by following the Horizon-500 specification. The analysis of the model is model based on the losses of the system. The cell temperature plays a role in affecting the value of losses in the model. The input pressure plays part in affecting the stack output of the mathematical model where it is proven that a higher pressure will produce large difference in the stack output. The efficiency for both mathematical and electrical is below 10% less compared to the specification of Horizon-500 specification thus the model parameter is verified.
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