A multicriteria analysis of the potential degradations of a photovoltaic module to assess its robustness

Photovoltaic (PV) modules in service undergo more or less severe degradation depending on their operating environments, ages and technologies. In this work, we investigated the coupled influence of the climatic conditions of operation and of the degree of deterioration of a PV module on its energy production. We considered four silicon PV modules characterized in standard test conditions. The PV conversion is modeled by a single diode model taking into account the presence of a fault. Matlab/Simulink software was used to calculate the energy supplied at a constant load for the PV module with and without defects. The ratio between the energy produced with fault and without fault allowed to quantify the percentage of loss. This loss was plotted according to the degrees of degradation of the short-circuit current Isc, the open-circuit voltage Voc, the series resistance Rs and the shunt resistance Rsh. It is shown that when irradiance is held constant, the energy loss is lower with increasing temperature for Isc and Rsh, and vice versa for Voc and Rs. While the temperature is kept constant, the energy loss is lower when the irradiance increases for Isc and Rsh, and inversely for Voc and Rs. A multicriteria analysis enabled to determine the most robust module among the four ones

Control and restrictions of a hybrid renewable energy system connected to the grid: a battery and supercapacitor storage case

This paper studies a Hybrid Renewable Energy System (HRES) as a reliable source of the power supply in the case of the connection to the grid. The grid connection imposes restrictions to the power delivered and harmonic content on the HRES. This causes the HRES to use multiple control systems and subsystems, as the normalization of the measurements, the current control, active harmonic compensation, synchronization, etc., described in this paper. Particular attention was paid to interactions in the storage system of the HRES. The durability of the HRES can be increased by the combination of the supercapacitors and batteries. This requires a power management solution for controlling the energy storage system. The aim of the supercapacitors is to absorb/inject the high-frequency fluctuations of the power and to smooth out the power of the batteries system of the HRES. This can be possible owing to the use of a low-pass second order filter, explained in this paper, which separates the high-frequency component of the storage system reference for the supercapacitor from the low-frequency component for the batteries system. This solution greatly increases the reliability and durability of the HRES

Système multi-sources de production d'énergie électrique (méthode de dimensionnement d'un système hybride et mise en œuvre expérimentale de l'optimisation de la gestion d'énergie)

LE HAVRE-BU Centrale (763512101) / SudocSudocFranceF

Ultracapacitor integration for short‐term energy management in a hybrid system

International audienc

Attenuation of power fluctuations in wind diesel hybrid system - Using ultracapacitors and batteries

International audienceIn this paper, strategies of short and long term fluctuations mitigation are applied to a wind-diesel hybrid system. Ultracapacitors (UC) and batteries are operated in a complementary mode. The DC-bus voltage is maintained at a constant value by the diesel engine while providing a smoothed current. The proposed strategies are based on the wind power frequencies distribution between the storage devices (batteries and UC) using two low pass filters. Simulations and experimental results are presented and analyzed

Use of Ultracapacitors and Batteries for Efficient Energy Management in Wind–Diesel Hybrid System

International audienc

Wind power integration in hybrid power system with active energy management

International audienc

Efficient management of energy transfer in wind diesel hybrid system-battery and Ultracapacitors

International audienceThis paper deals a new strategy for wind-diesel hybrid system energy improvement using Ultracapacitors (UC) and Battery. Energy management strategies are focused on the frequencies distribution of the wind generator current between UC and Battery. The developed control laws are based on the knowledge of the dynamic behavior of each source, in aim to prevent the diesel generator against the fluctuating currents while improving the battery's lifetime. The proposed strategies are implemented in the Microchip microcontroller (PIC18F4431) for experimental tests. Some experimental results obtained from this strategy are presented and analyzed