**Preface to "Grid-Connected PV Plants"**

This Special Issue discusses different aspects of the increasing presence of nonprogrammable renewable energy sources (RESs) in current power systems, mainly focused on photovoltaic (PV) power plants connected to the grid. Under this framework, coordinated voltage and reactive power control analysis are discussed and evaluated, as well as technical and economic PV studies. In addition, some contributions regarding hybrid solutions considering the variable nature of RES and discussion of grid synchronization and PV module orientation are included in this Special Issue, where PV power plant integration is approached from a transversal perspective.

> **Angel Molina-Garc´ ´ ıa, Rosa Anna Mastromauro** *Editors*
