Photovoltaic power generation unit and photovoltaic power generation system

The utility model provides a photovoltaic power generation unit. The photovoltaic power generation unit comprises multiple groups of photovoltaic arrays; and a photovoltaic array combiner box having a photovoltaic array converging circuit and a monitoring unit. The photovoltaic array converging circuit is respectively connected with the multiple groups of photovoltaic arrays and used for making the direct currents output by the multiple groups of photovoltaic arrays converged into one direct current and further outputting the one direct current. The monitoring unit is used for monitoring current signals output by the multiple groups of photovoltaic arrays and voltage signals output after a converging process in a real-time manner and further transmitting the signals to a first electric power carrier wave conversion unit. The photovoltaic power generation unit also comprises the first electric power carrier wave conversion unit used for modulating the current signals and the voltage signals to an electric power cable; a second electric power carrier wave conversion unit used for demodulating the current signals and the voltage signals from the electric power cable and further outputting the signals through an inversion chamber communication unit; and the inversion chamber communication unit. Correspondingly, the utility model provides a photovoltaic power generation system. Communication can be achieved with no independent wiring between the photovoltaic array combiner box and the inversion chamber communication unit. Meanwhile, the communication signals are stable and reliable.