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Improving the energy conversion stability of hybrid solar photovoltaic / wind turbine renewable energy systems

Aşçıoğlu, Berk
In the last few years, renewable energy sources such as wind turbines, photovoltaics, hydropower stations etc. have become widespread because of raising energy needs of the world. Since the fossil fuel consumption excessively has increased, lack of energy has caused the renewable energy requirement. Furthermore, renewable energy has an important role because of the economic and environmental worries. In other words, industrial and inhabitant needs by provided the traditional energy is no longer a successful way due to the high cost and peripheral concern. Besides renewable energy sources, during the recent years, the power electronic technology has grown rapidly because of improvement of semiconductor devices switching quickly, real time computers implementing advanced and complex algorithms. These improvements also have led to the development of the lower cost converters which can be used to make the connection between renewable energy sources and electric power system grids. This thesis will investigate the issues when connecting renewable energy sources to the electric power system grids and try to solve these issues by analyzing the effects of filter techniques, new switching methods and converter designs. In this thesis conventional techniques will be examined by a broad research and new methods will be proposed in order to make the solutions of power quality issues easier. Also, due to the insufficient renewable energy that is caused by uncertain behaviors of renewable sources, important electrical and electronic components will be examined. Finally, there will be some case analysis and comparisons of different connection types to explain how the system can be optimized in term of harmonic distortion. Compared to the 2 level inverters, 3 level inverters 10 % better energy yield in the current waveform, and with the battery usage, both systems have 2 % of increased energy efficiency