Distributed control of grid-connected energy storage system and nonlinear load-based stability performance improvement

Recently, researchers are increasingly paying attention to the continuous use of renewable systems (such as fuel cells, wind, or solar) due to increased energy consumption, energy supply, and prevention of environmental damage. Photovoltaic power generation (PV) systems are one of the most important low-cost ways among new energy sources. In this paper, a photovoltaic (PV) system is used as the main power generator, and also PEMFC is used as energy storage equipment. The advantages of the proposed system include environmental compatibility, reduction of system noise, and low cost. The proposed control strategy also ensures the system stability in various situations of connection of distributed generation sources, such as photovoltaic system to the grid and non-linear load, which brings the island mode of operation. In addition, a battery with a fuel cell is used to store energy, which has a control system similar to the control of the distributed generation system and does not need to change the control mode of the system when changing the mode from an island.