This study focuses on the causes of the general protection triggering of the photovoltaic power plant of the Zagtouli site located in Ouagadougou in Burkina Faso, in West Africa. The objective of this work is to diagnose the causes of the photovoltaic power plant decoupling during the injection of PV electricity on the distribution grid. The methodology consists of collecting and analyzing data from the photovoltaic power plant in order to diagnose the causes of the injection decoupling of photovoltaic electricity. The results of this study show that the causes of decoupling of the Zagtouli solar power plant are mainly related to the voltage variation at the connection point outside the admissible range. However, a frequency fault leads to a voltage fault. It is then necessary to set up an automatic dynamic regulation of the voltage dedicated exclusively to the photovoltaic power plant. [ABSTRACT FROM AUTHOR]