Investigations on interconnection of wind-solar hybrid Renewable Energy Source to the ideal grid at the distribution level together with power quality improvement features

Abstract

one of the most challenging issues that modern man is facing nowadays is global warming and scarcity of fuel. To find a solution to the above problems the focus of research is directed towards Renewable Energy Sources (RES). Among all available RES the combination of wind-solar RES provides the most reliable solution to the utility as both of them are complimentary to each other. As all the energy sources including RES are scattered across the globe, it becomes necessity to extract available green energy at the distribution as well. Non-linear loads connected at the Point of Common Coupling (PCC) inject current harmonics into the system thereby pollutes the grid environment. Shunt active power filter is found to be one of the feasible solutions in addressing issues related to the non-linear loads. This paper deals with the study of integration of wind-solar hybrid energy system to the grid at the distribution level. Here the active power filter functionality has been added to the interfacing four leg inverter to reduce overall cost of the system. The system is studied under three different cases of RES=0, Load Demand<RES<0, RES<Load demand. Simulation results shows that for all the cases power quality improvement is taking place with the help of I<inf>d</inf>-I<inf>q</inf> control strategy.