Development of a control scheme for grid connected solar inverter

Abstract

Now-a-days the renewable energy sources (RES) are going under development, research and implementation to serve the civilization. Solar energy is the most easily available RES. A solar grid connected scheme, consists of the photovoltaic (PV) module, voltage step up converter, and DC to AC converter is discussed in this work. The control technologies like (i) maximum power point tracking (MPPT), (ii) grid synchronization and (iii) sinusoidal current injection into the grid are considered in this work. The Incremental Conductance (IC) technique is used here to attain the MPPT of the PV arrangement. A Second Order Generalized Integrator (SOGI) based PLL is developed to collect the grid voltage phase angle for synchronizing with the inverter. A Proportional-Resonant (PR) based controller is developed for regulating the exchange of power with the single phase grid as well as to reduce harmonic distortions in injected current.