Study of the Cross-Coupling Effects (CCE) in series connected Distributed MPPT systems

Abstract

One of the abundant available renewable source of energy that has attracted interest of researchers today has been the solar energy. The demand for the harvesting of maximum energy has called for innovation of newer methods or technologies so that the PV panel can be operated at its peak power under partial shading and various dynamic atmospheric conditions.
In this thesis, we have discussed the modeling of a PV module. We have observed the characteristics of the PV module for different temperatures and solar insolation. The Perturb & Observe (P&O) maximum power point tracking algorithm has been employed to operate the panel voltage at its MPP. The direct duty ratio control has been employed. The demand for high voltage operations requires the PV modules to be series connected. So, when the modules are series connected, under partial shading and various dynamic atmospheric conditions the classical MPPT control strategy fails. The Distributed Maximum power point tracking (DMPPT) control technique has been a good replacement to the classical MPPT algorithm. So the DMPPT technique has also been discussed thoroughly. Under partial shading conditions there has been seen some peculiarities in the system when the modules are series connected. Such peculiarities are known as the CrossCoupling Effects (CCE). The coupling effects have been studied and detected thus.