Designing a Control Strategy for PV-Wind-BESS based Microgrid system and Integrating it with a Weak Grid

Policy makers and researchers are looking towards renewable energy sources due to the rising realization in emissions of greenhouse gases and the implications of these pollutants, as well as the ever-increasing need for electric energy. These renewable energy sources are connected in a distributed manner along with the loads constituting microgrids (MG). As a consequence of this, MG that utilise a variety of sources of energy have made significant strides in the past several years, paving the way for the integration of hybrid MG with the power systems that are already in place. However, it is required to conduct an in-depth critical analysis of the practical challenges involved in the control strategy of these MG. In this context, this paper will discuss a control strategies like voltage control, current control and frequency control of micro sources in MG along with droop based MG voltage controller. Islanding of MG is investigated in both the cases when MG imports the power from grid and exports the power to the weak grid. The overall model is simulated and the performance of the proposed controller is investigated by considering solar photovoltaic (PV), wind energy and battery energy storage system (BESS) based MG integrated to the grid. Performance analysis has been carried out to verify how well the proposed controller works.