A still booming installation of solar photovoltaic (PV) systems has been witnessed worldwide. It is mainly driven by the demand of “clean” power generation. Grid-connected PV systems will become an even active player in the future mixed power systems, which are linked by a vast of power electronics converters. In order to achieve a reliable and efficient power generation from PV systems, stringent demands have been imposed on the entire PV system. It in return advances the development of power converter technology in PV systems. This paper thus takes an over-view of the advancement of power electronics converters in single-phase PV systems, being commonly used in residential applications. Demands to single-phase grid-connected PV systems as well as the general system control strategies are also addressed in this paper.