Design architecture and real time distributed maximum power point tracking dmppt method for pv system

Abstract

The solar power processing has been improved significantly with the continuous tech- newlinenological developments in distributed PV systems. To enhance the power capability newline newlineof the distributed PV system, a number of PV modules are connected in series and newline newlinemany such series strings are connected in parallel. The PV module current and volt- newlineage vary significantly by the variation in atmospheric irradiance and temperature. newline newlineThe current generated by the series PV string is significantly limited by the mismatch newlineamong PV modules. A PV module has unique maximum power point (MPP) on its newline newlineI-V and P-V characteristics at a particular atmospheric condition. However there ex- newlineist multiple maximum power points under non uniform illumination which results newline newlinein reduction in power generation of a PV system. The main factors responsible for newlinemismatch among PV modules in the PV string are partial shading, manufacturing newlinedefects, aging etc. Therefore a major challenge associated with the distributed PV newlinesystem is to continuously track the MPP of each PV module which changes with newlinevarying atmospheric conditions. newlineIn order to extract the maximum power from distributed PV systems, different newline newlineMPPT methods with power electronic solutions have been reported in the litera- newlineture. Namely, Global maximum power point tracking (GMPPT), Reconfiguration newline newlinemaximum power point tracking (RMPPT) and Distributed maximum power point newlinetracking (DMPPT) methods are the main solutions available in the literature. The newlineDMPPT method is advantageous and implemented using two configurations. One newlineconfiguration uses full power dedicated DC-DC converter and another one uses only newlinedifferential power dedicated DC-DC converter. newline