Monitoring, modelling and simulation of PV systems using LabVIEW

A modified bypass circuit for improved hot spot reliability of solar panels subject to partial shading

https://pure.hud.ac.uk/ws/files/14003465/Manuscript.pdf

Novel hot spot mitigation technique to enhance photovoltaic solar panels output power performance

A simplified model for photovoltaic modules based on improved translation equations

In this paper, the applicability of the well-known single-diode equivalent circuit to modeling amorphous silicon photovoltaic modules is questioned It is shown that, unlike in mono- and polycrystalline modules, all of the equivalent circuit parameters are irradiation dependent This dependence may be derived from either manufacturer-provided or measured I-V curves for different irradiation levels In order to extract the equivalent circuit parameters, the suggested approach combines numerical solution of two transcendental and two regular algebraic equation systems with single-parameter fitting procedure Two additional parameters are introduced to describe temperature dependence of photocurrent and diode reverse saturation current As result, a set of seven parameters is obtained, comprehensively describing the panel performance for arbitrary ambient conditions It is shown that characteristic curves obtained using the proposed approach match well the manufacturer-provided data for various values of temperature and irradiation

Issues in Modeling Amorphous Silicon Photovoltaic Modules by Single-Diode Equivalent Circuit

A straightforward non-invasive method is proposed to accurately evaluate the shunt resistance of an elementary cell of a photovoltaic module connected in an installed string without requiring prior knowledge of the parameters of the intrinsic diodes. The approach relies on the measurement of the current–voltage characteristic of the whole string after intentionally shading the selected cell. Calibrated PSPICE simulations are employed to illustrate the method and test its reliability. As a case study, the shunt resistances of several cells belonging to a series array of 10 commercial panels are determined.

Matteo Gargiulo

Papers

A straightforward method to extract the shunt resistance of photovoltaic cells from current-voltage characteristics of mounted arrays