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Articles by Mohammed Rasheed
Total Records ( 5 ) for Mohammed Rasheed
  Mohammed Rasheed , Entisar El-Hihi , Saber Al-Rousan and Ahmad Abu-Hilal
  Four potential borrow sites (sources of sand) for beach nourishment were selected at the Aqaba terraces and dredged offshore sand along the Jordanian coast of the Gulf of Aqaba, and at Al-Humaimah and Wadi Rum sand dunes north and northeast of Aqaba town. An elution test has been performed on the sand materials of these potential borrow sites to determine the levels of dissolved inorganic phosphorus and dissolved inorganic nitrogen that might be leached from the sand particles when they come into contact with seawater, and examine their suitability for beach replenishment works. The levels of total phosphorus, total nitrogen, organic matter and selected heavy metals were also measured in the sand materials after the elution test and compared with their levels in the same samples before elution and with their levels in the natural beach sand of the study area. The results of the tests show that the concentrations of the measured pollutants are low in the sand materials of the borrow sites, and the amounts of these pollutants that may reach the seawater of the Gulf of Aqaba, if quantities as large as 100,000 tons of the sand materials were used in beach nourishment projects, are very low when compared with their levels in seawater. The results of the tests, as well as organic matter and mud contents of the sand materials, indicate their suitability for use in beach nourishment. However, the Aqaba uplifted terraces would be the most suitable and the lowest cost source because they are common along the shores of the Gulf of Aqaba.
  Hazim Imad Hazim , Rosli Bin Omar , Imad Hazim Mohammed , Ahmed N. Abdalla , Marizan Bin Sulaiman and Mohammed Rasheed
  Estimation (SE) techniques play important rule to anticipate security possibilities and operation control. Optimizing SE gives a better quicker update on the state operation of the power system without nature of system modelling. In this study, distrusted power system state estimation based on firefly was proposed. Various scenarios including normal operation where centralized and decentralized power area introduced. The IEEE 13 bus systems tested and the results are compared with those obtained Weighted Lease Square (WLS) to demonstrate the validity of the proposed approach.
  Rosli Omar , Mohammed Rasheed , Marizan Sulaiman and Wahidah Abd Halim
  In this study, modified multilevel inverters based on Newton Raphson (NR) and Particle Swarm Optimization (PSO) techniques were presented. A NR and PSO techniques were presented for Selective Harmonics Elimination (SHE) solution in a modified Cascaded H Bridge Multilevel Inverter (CHB-MLI). The Selective Harmonic Elimination Pulse-Width Modulation (SHE-PWM) is a powerful technique for harmonic minimization in multilevel inverter. The proposed design was used to charge the energy storage such as battery, super capacitor. NR and PSO techniques were used to determine the switching angles by solving the non-linear equation’s analysis of the output voltage waveform of the modified CHB-MLI in order to control the fundamental component. The proposed techniques based on NR and PSO techniques are capable to minimize the Total Harmonic Distortion (THD) of output voltage of the modified CHB-MLI within allowable limits. A comparison has been made between NR and PSO techniques related to optimization in order minimize harmonic distortion. The main aims of this study cover design, modeling, construction and testing of a laboratory the modified topology of the CHB-MLI for a single-phase prototype for nine levels. The experimental results of the prototype were also, illustrated. The controllers based on NR and PSO were applied to the modified multilevel inverter. The Digital Signal Processing (DSP) TMS320F2812 is used to implement these modified inverters control schemes using NR and PSO method. The proposed controller was then coded into a DSP TMS320F2812 board. The inverter offers much less THD using PSO scheme compared with the NR scheme.
  Mohammed Rasheed , Rosli Omar , Marizan Sulaiman , Wahidah Abd Halim and Moataz M.A. Alakkad Majeda
  In this study, Artificial Intelligence (AI) technique is applied to determine the switching angles for a uniform step asymmetrical modifiedmultilevel inverter by eliminating specified higher-order harmonics while maintaining the required fundamental voltage and current waveform. Artificial intelligence technique based on Selective Harmonic Elimination (SHE) method in a modifiedmultilevel inverter has been proposed in this study. The Selective Harmonic Elimination Pulse-Width Modulation (SHE-PWM) is a powerful technique for harmonic minimization in multilevel inverter. The proposed a five-level Modified Cascaded H-Bridge Multilevel Inverter (M-CHBMI) with Artificial Neural Network (ANN) controller to improve the output voltage and current performance and achieve a lower Total Harmonic Distortion (THD). The main aims of this study cover design, modeling, prediction for real-time generation of optimal switching angles in five level modified topology of the CHB-MLI for a single-phase. Real-time application of Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM) technique is limited due to the heavy computational cost involved in solving aspecified number of transcendental nonlinear equations known as Selective Harmonic Elimination (SHE) equations that contain trigonometric functions. Simulation of a 5-level inverter in MATLAB/Simulink reveals that the proposed method is highly efficient for harmonic reduction in modified multilevel inverter.
  Rosli Omar , Tan Zi Hao , Mohammed Rasheed and Marizan Sulaiman
  The distorted waveforms due to highly uses of the non-linear load, especially, the current that is considered the main issues need to be addressed seriously. The issues of the distorted waveforms for the current have attracted many researchers to recover them in the electrical system. There are so, many electronic devices that have been used in order to protect the waveform of the current from distorted as it is very dangerous and may cause the main supply to shut down or burnt. The main aims of this project is to design and develop a shunt active power filter for the purposes to mitigate the distorted of current waveform produced by the different types of non-linear loads using the controller of the SRF. The software MATLAB/Simulink will be used to design and develop shunt active power filter and its controller. Finally, the performance of the shunt active power filter and its controller at different types of non-linear loads will be evaluated through the waveforms of the currents produced by different types of non-linear loads and the Total Harmonic Distortion (THD) will be monitored and observed whether meets to the International Electrical Committee (IEC) standard or not.
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