A novel distributed PV system with ultra-high-frequncy-AC bus for residential applications

In this paper, three existing distributed PV system configurations are reviewed and compared in depth. A novel ultra-high-frequency-AC (UHFAC) PV system for residential application is proposed. Compared with traditional DC parallel PV systems, this new approach eliminates the high voltage DC bus by replacing it with UHFAC bus, which avoids the DC arcing fault and enables ultra-fast short circuit protection as well. Resonance is utilized in this system to help UHFAC power transfer and realize soft-switching. Cable modeling is conducted to extract AC parameters, which helps validate the UHFAC power transmission (i.e., 100 kHz) in 30 to 40-feet-distance. Cable parameters also participate in the resonant intervals which demonstrates full utilization of system components. Simulation and experimental results are provided to verify the proposed approach.