A Study on the Design and Transient Characteristics of Grid-Connected Photovoltaic Systems

This study investigated the design of a grid-connected photovoltaic (PV) system based on solar power generation and its characteristics during ground-fault incidents. Various approaches to enhance the stability and efficiency of the PV system were explored. Experimental results confirmed that the integration of solar arrays, DC/DC converters, and inverters optimized the output characteristics of the system. In particular, the analysis focused on current changes and control mechanisms during ground fault incidents and compared the effectiveness of DC circuit breakers and superconducting fault current limiters. Simulations were performed to propose solutions to address the problem of sudden increases in fault current. The results demonstrated the effectiveness of DC circuit breakers in limiting fault currents. Additionally, the application of fault current limiters improved both fault current limitation and response times for disconnection. The results of this study enhance the safety and economic operation of solar power systems and facilitate the adoption of eco-friendly energy. The results can be used as a reference for the design and operation of solar power systems in the future and can support the implementation of renewable energy policies.