Abstract The ‘mismatch losses’ problem is commonly encountered in distributed photovoltaic (PV) power generation systems. It can directly reduce generation. Hence, PV array reconfiguration techniques have become highly popular to minimize the mismatch losses. In this paper, a dynamical method for Total-Cross-Ties (TCT) and Series–Parallel (SP) interconnected arrays proposed. aims improve maximu...

Under non-uniform operating conditions, photovoltaic (PV) generators may have several maximum power points (MPP) and voltage of the global MPP (GMPP) vary quickly over a wide range which cause problems for tracking GMPP. Since highly varying GMPP causes fluctuation inverter reference voltage, it would be beneficial to operate PV system in more predictable straightforward manner by keeping point...

In a conventional grid connected photovoltaic system employing centralized inverter with long strings connected across dc-link, the performance of the plant in terms of power generation and efficiency is not optimal especially during partial shading and/or panel mismatch conditions. To improve the power yield during such conditions, a splitmultistring configuration employing 3Level Neutral Poin...

To identify abnormal photovoltaic (PV) modules in large-scale PV plants economically, drone-mounted infrared (IR) cameras and automated video processing algorithms are frequently used. While most related works focus on the detection of modules, little has been done to automatically localize those within plant. In this work, we use incremental structure-from-motion obtain geocoordinates all a pl...

In recent years, due to the fact that non-renewable energies come to an end, renewable energy is expected to provide a significant part of the future needs of Iran. Among these energies, solar energy is a suitable option for a wide range of the country, due to availability, proper radiation intensity, and high sunshine times during the year (about 300 sunny days per year). The purpose of this p...

wewanttofindthecosmologicalconstantinfluenceoncosmicmicrowavebackground(cmb)temperatureduetomovinglinearcosmicstrings.usingthespace-timemetricofalinearcosmicstringinanacceleratedexpandinguniverse,thegott-kaiser stebbins(gks)effect,asanimportantmechanisminproducingtemperaturediscontinuityinthe(cmb),isconsidered;then,itsmodificationduetotheeffectofthecosmologicalconstantiscalculated.theresultshowsthat...

Photovoltaic (PV) systems based on multistring configuration are the best effective solution, given its advantages in terms of system availability, reliability, and energy efficiency. In this particular each substring has own dc-dc converter a dedicated maximum power search algorithm which increase cost complexity. article, an efficient centralized global tracking (GMPPT) for PV array subject t...