Himanshu Sekhar Sahu

Maximizing the Power Generation of a Partially Shaded PV Array

As per energy efficiency of a photovoltaic (PV) system is concerned, partial shading is an important issue. Under partial shading condition, the modules of a PV array receive different levels of solar irradiation, so the power generation of a PV system decreases. The power-voltage characteristic of a partially shaded PV array contains multiple local maxima, and the global maximum power point is one of them. The losses in a PV array depend on the shading pattern and the physical location of shaded modules. This paper presents the Futoshiki puzzle pattern for the arrangement of the modules of a PV array under partial shading condition, ensuring the enhancement of the power generation with respect to totally crossed tired (TCT) structure. In this method, the physical locations of modules in a TCT structure PV array are rearranged without changing the electrical connection of the modules. A comparison between the power generation in TCT and Futoshiki puzzle pattern configuration is presented. It is demonstrated that the power generated by a PV array in the Futoshiki configuration method is enhanced, and mismatch loss (ML) is minimized under different shading patterns by theoretical, simulation, and experimental results.

Parameter estimation of double diode photo-voltaic module

Solar Energy is a clean and boundless energy source and the worldwide solar market demand is increasing for industrial and domestic purposes. The purpose of this paper is to show the comparison of Stochastic Method(Genetic Algorithm) over derivative methods. A mathematical development [3] is provided for the extraction of Solar Panel equivalent circuit parameters from datasheet values. The analytical approach is selected for the mathematical development as the initial-point vital for proper evaluation of the Parameters of the double diode Model of PV cells. And thus using Evolutionary technique to extract the values of the parameters, a valid comparison has been presented between the numerical approaches and the Evolutionary Algorithms.

Extraction of Maximum Power From a PV Array Under Nonuniform Irradiation Conditions

In this paper, a generalized algorithm for the physical relocation of the modules with a fixed electrical connection (PRM-FEC) in total cross tied (TCT) configuration of an m × n (where m and n are the number of rows and columns) photovoltaic array is presented for digit m that is either odd or even number. This rearrangement of the TCT configuration distributes the shadows over the array, and hence, it increases the power output of an array under partial shading conditions. The proposed scheme is simple and cost effective. The comparison of power generated by an array with the TCT, electrical array reconfiguration, and the PRM-FEC configuration is performed with MATLAB simulation and also the simulation results are validated with experimental results. The performance of the PRM-FEC configuration is superior to the TCT configuration.

A novel approach to extract maximum power from partially shaded PV array

The modules of a PV array receive different intensity of solar irradiation under partial shading condition and hence mismatch losses occurs between the modules. Multiple local maxima exist in the power-voltage characteristics of a PV array and out of multiple local maxima one of them is a global maximum power point (GMPP). This paper presents a new approach to distribute the shading effect over the entire array to reduce the mismatch losses, and enhance the power output of a PV array. In this approach, the physical position of the modules in the Total Cross Tied (TCT) configuration are arranged, without changing the electrical connection of the modules, and also the arrangement of the modules in the TCT configuration is done in such a way that, the shading effect is distributed over the entire array, and hence it reduces the multiple local maxima in power-voltage characteristics of a PV array. Thus the tracking of GMPP in the present approach is simpler. In this paper, the output power of a PV array estimated theoretically and by MATLAB simulation for the TCT and the proposed configuration is compared. It is investigated that, the power generation of a PV array with proposed configuration is improved compared to the TCT configuration under different shading patterns.

Improvement in the power generation of a PV array under partial shading conditions

Photovoltaic (PV) arrays are susceptible to large amounts of power losses due to partial shading on the array. The power-voltage characteristics of partially shaded array contain multiple local maxima and global maximum power point (GMPP) is one of them. The losses in the PV array depend both, the shadow shape and physical location of the shaded modules. This paper presents an innovative approach to arrange the modules in the array in such a way that there is an increase of power generation of array under partial shading condition. In this approach, without changing the electrical connection of the modules, the physical locations of the modules in Total Crossed Tired (TCT) structure are rearranged. The modules are rearranged in such a way that the shading effect is distributed over the array, and it reduces the shading modules in the same row. The power generation of array with TCT and proposed configuration is compared in this paper. It is demonstrated that the power generation of array with proposed configuration is enhanced under different shading pattern.

A novel approach to improve power output of PV array under different shading conditions

Improvement of energy efficiency of photovoltaic (PV) system is needed to fulfill the energy crises. The power generation of PV array decreases due to partial shading occurs on the PV array. In partial shading condition, the PV modules of the array receive different intensity of solar irradiation and hence mismatch losses occurs between the modules. Thus the power-voltage characteristics of PV arrays contain multiple local maxima and one of them is a global maximum power point (GMPP). This paper presents an novel approach to arrange the physical position of modules in Total Cross Tied (TCT) configuration, without changing the electrical connection of the modules in the array. In this approach, the arrangement of PV modules of TCT configuration is done in such a way that the shading effect is distributed over the entire array, and hence it reduces the multiple local maxima in power-voltage characteristics of the PV array. Thus the tracking of GMPP in the present approach is simpler. In this paper, the power generation of array with TCT and proposed configuration is compared with theoretical and MATLAB simulation results. It is investigated that the power generation of PV array with proposed configuration is enhanced under different shading patterns.