Improvement in power quality by Grid Interconnection of Renewable Energy Sources

Due to disperse nature of renewable energy resources (RES), electricity generation is often taking place in small scale but main drawback is power quality. So to improve power quality issues, integration of renewable energy into the utility grid can be done either at transmission level or the distribution level depending on the scale of generation. The renewable resources like solar energy, wind energy, fuel cells, biomass energy, etc. are interconnect using various power electronics converters. Generally voltage source inverters are used to interface the intermittent RES in distributed system. This paper presents integration of solar energy and wind energy resources for distribution level using multi-level inverter and its control strategy to achieve the voltage profile of system. Usually, the photovoltaic energy sources generate power at variable low dc voltage, while the variable speed wind turbines generate power at variable ac voltage. Thus, the power generated from these renewable sources are interconnect using various converters before connecting on dc-link. The voltage source inverter is a key element of a distributed generation system as it interfaces the renewable energy source to the grid and delivers the generated power. This concept of interconnection of solar and wind energy is designed and simulated in MATLAB-Simulink for non-linear load. KeywordsRenewable Energy Sources, Power Quality, Distribution, Grid Interconnection, DG, THD.