The photovoltaic (PV) generating system has high potential, since the system is clean, environmental friendly and has secure energy sources. There are two types of PV system, which are grid connected and standalone systems. In the grid connected photovoltaic system (GCPV), PV generator supplies power to the grid, whether or not the whole or a portion of the generated energy will be used to supply load demands. Meanwhile, the standalone photovoltaic system (SAPV) is used to fulfil a load demand that close to its point of use. These days, many researchers study in term of optimization sizing of photovoltaic system, in order to select optimum number of PV modules, inverter, battery storage capacity, and tilt angle. Based on that, this review aims to give explanations on approaches done by previous researchers in order to find ultimate combinations for design parameters. Moreover, the paper discusses on modelling of PV system components, which includes PV panels’ output power estimation and battery system. Finally, simulation softwares that used as sizing tools in previous studies are reviewed and studied.

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Photovoltaic (PV) systems are frequently exposed to partial or complete shading phenomena. Partial shading has a profound impact on the performance of solar power generation. The operational performance of PV arrays under partial shading shows multiple maximum power point peaks, therefore it is challenging to identify the actual maximum power point. This paper investigates the impact of partial shading location on the output power of solar photovoltaic arrays with various configurations. Multiple photovoltaic strings, in both parallel and series configurations, are considered. Different random shading patterns are considered and analyzed to determine which configuration has higher maximum power point. The sensitivity of the partial shading can change according to the partial shading types, shading pattern, and the configuration used to connect all PV modules. Moreover, the study also investigates the output of the PV array with shading two random models, two consecutive models, and three random and consecutive modules. Experimental results validate the analysis and demonstrate the effect of various partial shading on the efficiency and performance of the PV system.

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This paper addresses the GHG emissions from oil and gas extraction, production and combustion and other emissions sources in Libya. In general, this research deals with the primary energy tracing from well to wheel leading to inventor of pollutants emitted through this path. This study presents the first work conducted in the estimation of costs of the environmental damages caused by GHG emissions from Libyans activities, we involved not only the energy or industrial facilities but also the waste and livestock in this process. For Libyan market, we adopted a cost of CO 2 e is 44 LD/ton CO 2 e (which equivalents to 32 US$ or 29 €), the present study reveals that the prices of all fusel fuel must be increased by 79%, 138%, 19% and 80% for Gasoline, Diesel, Air-jet fuel and LPG respectively, and by 8%, 143%, 6%, 3% and 14% for air traveling tickets, MWh of electricity, ton of steel, ton of cement, kg of red meat and ton of garbage, respectively. The total revenue as a result of the implementation of carbon tax is 4.4 billion LD which equivalent to 10% of the Libyan GDP in 2015. The followed procedure enables to investigate the effect of each type of energy, production or service on the environment individually. This research paved the road for more intensive researches to account all pollutants in the social-economical-environmental system.