Self-Adjustable Step Based Control Algorithm for Multifunctional PV System under Sag-Swell Conditions

This paper describes the single-phase grid connected multifunctional solar PV (Photovoltaic) system with seamless power transfer capability. This multifunctional PV system is also helpful to enhance the quality of power in the utility grid. This PV system comprises of two stages. First stage is a boost converter that performs the MPPT (Maximum Power Point Tracking) and another is VSC (Voltage Source Converter) that executes the task of harmonic elimination, injection of harvested energy to the utility along with non-active power compensation. A PI (Proportional Integral) controller is used to sustain the DC link voltage to a specific value. In order to improve the dynamic response of the PV system, a feed-forward control for solar PV participation is used. A self-adjustable step-based control is introduced for the VSC of PV system in this work. This estimates the real power reflecting portion of the load current in order to show the all features of the PV system. Simulation studies are carried out in MATLAB Simulink. Under realistic deficient grid condition, the experimental performance of the developed PV system is found satisfactory.