ملخص البحث :

The outcome of this research is to study and validate a photovoltaic (PV) module connected to the resistive load using soft computing Maximum Power Point Tracking(MPPT). The MPPTs used in this study are the Artificial Neural Network (ANN) and Fuzzy Logic (FL)which are used to track the maximum power of a 200W PV module. First, the mathematical analysis for the PV module, ANN technique, and FL technique is done. The MATLAB Simulink was investigated to model, verify, and simulate the MPPTs. Second, the studied PV system was tested under step change in load and irradiance conditions to obtain the difference in the performance between the soft computing techniques and conventional Incremental Conductance (IC) techniques in terms of oscillation value, dynamic speed, and method’s efficiency. The obtained results from the simulation presents that both ANN and FL techniques have less steady state power oscillation, and they faster than the IC technique in terms of tracking the MPP. Therefore, the performance and efficiency of the studied PV module was improved and then the life time of the system is extended.

ملخص البحث :

Multilevel inverters (MLI) are designed to handle the medium voltage and high-power requirements of industrial plants or power systems. The traditional structure of the MLI topologies necessities additional switches and limits its wide range of use. This research describes the work done on a single-phase 7-level MLI with a reduced number of switches (RSMLI) topology used in a standalone photovoltaic (PV) system. The proposed RSMLI structure integration with three individual PV arrays controlled by fuzzy logic maximum power point tracking (FL-MPPT) technique and three boost converters instead of a separate direct-current (DC) source. The proposed MLI uses a smaller number of controlled switches, a lower number of PV arrays, and fewer diodes. Furthermore, a simple unipolar Phase Disposition Pulse Width (PD PWM) Modulation technique was used instead of the conventional high-cost bipolar PWM technique. The performance of the proposed inverter was tested under different solar irradiance levels and load conditions in the simulation using Matlab/Simulink. The results show that the proposed seven-switches MLI presents a 7-level at the output, and it offers good total harmonic distortion (THD) content in the output voltage where a THD value of 18.17% was obtained without filter