Publications Scientifiques

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Author: search.filters.author.Bouguerra, SaraSubject: search.filters.subject.Reliability

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    Modeling the Effect of PV Module Orientation on the Encapsulant Browning Degradation Rate in Algeria Region
    (IEEE, 2022) Bouguerra, Sara; Agroui, Kamel; Kaaya, Ismail; Bouraiou, Ahmed; Yaiche, Mohamed Rédha; Mansour, Djamel Eddine
    The encapsulant browning degradation mode of photovoltaic (PV) modules is affected by ultraviolet irradiance, ambient temperature, and humidity of the installation site. In this article, the degradation rate for encapsulant browning, measured by short-circuit current degradation, is estimated for different PV module tilt and orientation angles in the Algiers region, characterized by a temperate climate. The activation energy for encapsulant browning is calculated using the acceleration factor modeling of the field-to-field degradation and physical models, in conjunction with the meteorological data of two locations in Algeria, where the same module type is fielded for 9–10 years. The tradeoff between the PV energy production and the PV module lifetime is carried out for different PV module positioning, assuming that encapsulant browning is the main failure mechanism experienced in the field. The results reveal that the orientation angle affects the PV module lifetime, where orienting the PV module from east to west increases the lifetime up to 30%, and the lifetime energy production up to 6%, due to reduced degradation. It is also presumed that although the Saharan region of Adrar receives more UV light and ambient temperatures throughout the year in Algeria, the PV modules fielded in the Mediterranean region of Algiers suffer higher degradation, which is explained by the high humidity experienced in Algiers that accelerates the encapsulant browning failure mechanism.
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    Lifetime estimation and reliability of PV inverter with Multi-Timescale thermal stress analysis
    (IEEE, 2019) Bouguerra, Sara; Agroui, Kamel; Gassab, Oussama; Sangwongwanich, Ariya; Blaabjerg, Frede
    The reliability of the PV inverter is a critical issue because it is the less reliable component of the PV system. In order to lower the risks of failure and maintenance in PV systems, the factors that influence the PV inverter lifetime should be analyzed. Thermal stress is the main causes of IGBT failure in a PV inverter, which includes the fast cycling stress due to loss variations in an IGBT, and slow cycling due to mission profile fluctuations. In this paper, the design for reliability (DFR) approach based on mission profile analysis is used and demonstrated on a single phase, single stage, grid connected PV inverter installed in Algeria, where the lifetime is estimated by taking the effect of low frequency thermal cycling under long-term operation into consideration, in addition to the line frequency power cycling due to loss variations. The results reveal that low frequency thermal cycling have a significant impact on lifetime degradation and reliability of the PV inverter after many years of operation
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    The Impact of PV Panel Positioning and Degradation on the PV Inverter Lifetime and Reliability
    (IEEE, 2020) Bouguerra, Sara; Yaïche, Redha mohamed; Gassab, Oussama; Sangwongwanich, Ariya
    The PV inverter lifetime is affected by mission profiles, which include the solar irradiance and ambient temperature of the installation site. In previous research, the design for reliability approach has been used to evaluate the reliability of the PV inverter, where the solar irradiances have been measured on a fixed tilt and orientation angle. In most cases, the tilt is chosen to be the latitude angle and the orientation is facing south for maximum energy production throughout the year. However, the impact of the tilt and orientation of the PV array on the inverter lifetime has not been considered so far. The tradeoff between the PV energy yield and the inverter lifetime can be analysed for different PV array positioning. This paper thus evaluates the lifetime of the PV inverter with varying the tilt and orientation angle of PV panels, where the PV panel degradation rate is also taken into account. The evaluation is based on the mission profiles of Algiers, Algeria. The results reveal that orientation has a strong impact on the PV inverter loading and certain orientations result in high PV energy production and long lifetime of the PV inverter. It is also shown that the PV panel aging in Algeria has a significant impact on the lifetime estimation of the PV inverter for different orientations.
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    Reliability Analysis and Energy Yield of String-Inverter Considering Monofacial and Bifacial Photovoltaic Panels
    (IEEE, 2020) Bouguerra, Sara; Yaiche, M.R.; Sangwongwanich, A.; Blaabjerg, F.; Liivik, E.
    Bifacial PV panels are emerging technologies that can increase the energy yield of the footprint in PV systems and thereby potentially reduce the cost of energy compared to the conventional monofacial PV panels. However, the increased energy yield due to the capability of harvesting the solar energy from both front and rare surfaces of the panel can potentially increase the loading of the inverters used in the system for doing grid connection, and as a consequence affect the inverter reliability performance. This paper thus provides a comparison between monofacial and bifacial PV modules in terms of reliability of the PV inverter and energy yield of the overall system. The analysis is carried out with a mission profile from Algiers, Algeria, where different Albedo and PV module installation heights are considered. The results show that both aspects can affect the lifetime of the PV inverter considerably, and they should be taken into consideration during the design of PV inverter.