Optimal grid integration of renewable energy sources with energy storage using dq0 based inverter controller

In the present era, the contribution of renewable energy to energy supply is growing massively and it is replacing the conventional fuels in electricity generation. The intrusion of these Renewable Energy Sources (RES) to the grid has led to the increase in complexity of the system due to the varying nature of the RES. The low rotational inertia and the stability issues are the demanding problems faced in RES connected grid system. Enormous analysis has to be carried out to enhance integration and to provide an efficient and stable energy supply. In order to make this analysis undemanding, several transformations have been developed to transform system components to less -complex models. One such transformation that proves to be efficient is dq0 transformation. This paper presents the mathematical formulation of dq0, which forms the basis for modeling dq0 based system components. For efficient analysis of grid integration, an inverter controller is designed using dq0 quantities for a Solar Photovoltaic (PV) integrated grid. This dq0 transformed controller proves to be more efficient and simpler than the complex conventional controllers. This paper also aims to highlight the importance of energy storage system in maintaining the stability of the grid. The simulation results of PV connected grid system with various Energy Storage Devices manifests the crucial role played by the Energy Storage System in the optimal working of RES integrated grids.