In recent years, the photovoltaic (PV) system is becoming popular; because of rapidly increasing energy demand and the depletion of fossil fuel-based energy supply. The solar energy is much easier to be harvested, converted, and delivered to the grid/load through a variety of power converters. This thesis focuses on the power electronic interfaces and their controls, pertaining to stand-alone and grid-connected PV systems. A cascaded two-level inverter (CTLI) based PV system is considered in this book because of its modular circuit layout, low total harmonic distortion in current and voltage....