Active and reactive power control method for three-phase PV module-integrated converter based on a single-stage inverter

The concept of the module-integrated converters (MICs) incorporated in photovoltaic (PV) has recently imbibed a significant attention due to advantages such as low cost of mass production, high efficiency, easier installation, and improved energy harvest. This paper presents the current-source inverter (CSI) with dc voltage boost capability, called single-stage power conversion system, for grid-tied three-phase PV MIC systems. A reliable control system is adopted to modulate the proposed topology in such a way that provides both active and reactive power in order to meet power system needs. To reduce the number of actives switches, the topology utilizes the modified switching pattern based on conventional space vector pulse width modulation (SVPWM) method. It is demonstrated that the injected active and reactive power can be controlled through two modulation indices introduced in the modified SVPWM switching algorithm. The proposed structure is implemented in hardware and experimentally tested with 300-W laboratory prototype. The results verify the desired performance and robustness of the proposed control scheme for exchanging of both active and reactive powers between the PV MIC and the grid within different operating conditions.