In Figure 1, a typical configuration of a grid-connected PV system is represented. In a conventional PV system, the PV cells (arranged in a single module, a string of series-connected modules, or an array of parallel-connected strings) generate a dc current that greatly depends on the solar irradiance, temperature, and voltage at the terminals of the PV system. This dc power is transformed and interfaced to the grid via a PV inverter. Additional elements include a grid connection filter, a grid monitor or interaction unit (for synchronization, measurements, anti- island detection, etc.), and a low-frequency transformer (which is optional depending on local regulations, the converter topology, and the modulation used to control it [3]). Another option is an intermediate dc–dc power stage be- tween the PV modules and the grid-tied inverter. This optional stage decouples the PV system operating point from the PV inverter grid control. Additionally, it can boost the PV system dc output voltage if required or provide galvanic isolation and perform maximum power point tracking (MPPT) control.