Single Stage Power Control Strategy for Nanogrid Connected Solar PV System

Abstract

The focus on reduction of converter size in nanogrid connected Photo-Voltaic(PV) systems increases to obtain the various advantages. This paper proposesa single stage nanogrid connected solar PV system that works with DC-ACinverter along with the closed loop control strategy to send the maximumpower from the PV array. The proposed scheme controls the power deliveryof the PV system to nanogrid in a single stage power conversion along withthe incorporated Maximum Power Point Tracking (MPPT) controller. Thedecoupled control strategy has been designed and developed for the proposedsystem using synchronous reference frame theory. The developed hardwareprototype in the laboratory has been used to validate MATLAB/Simulink sim-ulation results. The simulation and experimental results have been observed for dynamic changes in irradiation by maintaining the Total Harmonic Dis-tortion (THD) within the standard limits while operating at unity powerfactor. The successful validation of the proposed control strategy shows itsusefulness in real-time nanogrid applications.