Operational reliability of connection schemes of photovoltaic systems with three single-phase grid inverters

The paper points out the main advantages of the grid inverters, used to connect photovoltaic modules to the electrical grids. A methodology is presented for evaluating the operational reliability of schemes for connecting photovoltaic systems with single-phase grid inverters and one backup inverter provided. Results from the performed calculations are presented. Conclusions, useful both for the design stage and the operation of photovoltaic systems, are made.