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The energy which is generated from natural resources that are abundantly available in nature is called Non-conventional energy sources. Light energy from sun, current of air, storage of water at hilltop, water movement inside sea, heat inside earth is the example of Non-conventional energy sources, etc. The solar energy is based on the conversion of sun rays into electrical voltage and current and it is the single-stage conversion of radiation into electricity. The photovoltaic (PV) power generation is a phenomenon in which photons from sun rays collide on PN junction of semi-conductor material and generates electrical energy. This solar power system uses the string of solar panels distributed over large areas. Power generated by these strings is affected by shadow initiated from different causes. The effect of these shadows is to reduce the power generated by the photovoltaic system. This paper explains the various effect of shadow on PV system and summarizes the different methods for improving the PV performance under shadow conditions. It also covers a wide review of the trends and state-of-art techniques indicated through research to curb the effects of partial shading.
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