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Articles by Wahidah Abd Halim
Total Records ( 2 ) for Wahidah Abd Halim
  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.
 
 
 
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