The increasing price of conventional fossil fuel and the need to reduce green-house gas emissions have prompted the adoption of clean electrical energy generation sources. The abundance of renewable energy, particularly solar and wind, over the world combined with increasing efficiency of the Photovoltaic (PV) cells has led to reducing cost per kWh of generated green electricity and created potential for establishing high power renewable energy systems at medium voltage scale. The design, fabrication, installation and testing of a large PV power generation systems still, however, pose great challenge in term of obtaining highly-efficient, highly-reliable, transformer-less with buck/boost voltage capabilities, and reduced cost and maintenance. This work is aimed to present the status of renewable energy installation worldwide and to discuss grid connected issues. The increasing penetration of PV energy has motivated the establishment of grid connection requirements. The requirements for power injection should be clearly defined: The grid requires sinusoidal AC with stable voltage and frequency, and the harmonics content should be kept within limits as addressed in various standards, codes, and guidelines. Hence, PV plants connected to the public grid give rise to two highly important requirements: the power quality of the grid should not be reduced when solar power is fed into the grid; and personal safety must be ensured in the event of mains interference. Large PV systems are usually tied at high-voltage level. Such systems consist of generation, transmission, distribution phases, and consumers at the end [1]. This proposed work will discuss the status of renewable energy worldwide installation at high level and will [resent the standards and regulations for the connection of PV renewable energy sources to electric grid. Different technical and non-technical issues related to the installation and the operation of such systems will be carefully discussed, analyzed and related problems investigated. There is a pressing need to review and to evaluate the design and operational constraints of large-scale renewable energy systems, therefore this work aims to discuss and open-up new avenues in this direction. References [1] H. Abu-Rub, M. Malinowski, K. Al-Haddad, Power Electronics for Renewable Energy Systems, Transportation and Industrial Applications. Hoboken, NJ: John Wiley & Sons, 2014 (in press).


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