Publications Scientifiques
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Item Impact of integrating DERs and ESS on Smart-Grid supply continuity : a review(IEEE, 2022) Kaddour, Djillali; Belaidi, HadjiraSmart-grid power distribution system's ideal objective is to provide a continuous power supply. The voltage waveform, Frequency also amplitude must meet their expected values in all respects, defining the power supply's quality. Electric distribution system continuity is essential for utilities as well as consumers. Progress in the economy, public health, and general well-being are all affected by the continuity and reliability of the power-grid distribution system. When the power supply goes down, The term "interruption of supply" or simply "interruption" is used to describe this. From the client's point of view, less frequent and briefer interruptions improve supply quality and continuity. By integrating distributed energy resources (DERs) and energy storage systems (ESS) into the power grid, reliability and continuity of power supply in the Smart-grid distribution system will increase. It is necessary to use continuity indicators, also known as "continuity indices" or "reliability indices", to quantify the continuity of the power supply. The main indices used in most countries are the SAIDI, SAIFI, and CAIDI. These indices are specified in IEEE Std. 1366. In this work, various studies are discussed and some researches on supply continuity in smart grids and the effects of integrating DERs and ESS on the reliability and continuity of power supply based on continuity indicators (SAIFI, SAIDI and CAIDI) are reviewed. Case studies on African countries is also included to demonstrate the usefulness and significance of continuity indicators to evaluate the grid distribution system's continuityItem Guest editorial : reliability and quality : analysis and applications(Emerald Group Holdings, 2022) Bhargava, Cherry; Sharma, Pardeep Kumar; Patil, Rajkumar Bhimgonda; Mellal, Mohamed ArezkiItem Reliability, availability, maintainability, and dependability analysis of Tube-wells Integrated with Underground Pipelines in agricultural fields for irrigation(2022) Kumar, Ashish; Saini, Monika; Rajkumar Bhimgonda, Patil; Sameer, Al-Dahidi; Mellal, Mohamed ArezkiReliability, Availability, Maintainability, and Dependability (RAMD) study of Tube-wells Integrated with Underground Pipelines (TIUP) is crucial as they are the backbone of the irrigation system. This study is carried out with an objective to perform RAMD analysis, and Failure Modes and Effects Analysis (FMEA) unified with the development of a novel stochastic model using Markovian approach to estimate the Steady-State Availability (SSA) of the TIUP. A real case study of a conventional TIUP system has been performed to validate theoretical and practical results of the proposed model. The failure and repair rates of all subsystems followed exponential distribution, and their impact on system/subsystem’s availability and other reliability measures has been investigated. All the repairs are perfect and random variables associated with failure and repair rates are statistically independent. The centrifugal pump and power supply units are the most critical components as far as reliability and maintainability aspects. The labor also plays a critical role in the operation of the TIUP systemItem 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 EddineThe 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.Item Reliability, maintainability, and availability analysis of a computerized numerical control machine tool using Markov chains(Budapest Tech Polytechnical Institution, 2021) Patil, Rajkumar Bhimgonda; Mellal, Mohamed Arezki; Bewoor, Anand K.; Al-Dahidi, Sameereliability, maintainability, and availability analysis of Computerized Numerical Control Machine Tools (CNCMT) is vital as they are widely used in manufacturing industries for mass production. This paper proposes a generalized framework for Time- Between-Failure (TBF) and Time-To-Repair (TTR) data analysis, integrated with Markov chains for estimating the system’s Steady State Availability (SSA). A case study of a typical CNCMT illustrates the applicability and the effectiveness of the proposed framework. The effect of variation of sub-systems' failure and repair rates on the availability of the CNCMT is studied. The critical sub-systems from reliability, maintainability, and availability point of view are identified. The analysis reveals that the CNCMT’s failure and repair rates are nearly constant and the CNCMT fails four times per year. The Lubrication Sub-system (LS) is the utmost severe sub-system as far as maintainability aspect is concerned and Turret Sub-system (TS) is the utmost severe sub-system from a reliability perspectiveItem 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, AriyaThe 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.Item Power transformer differential relay reliability assessment using false trip root cause analysis(IEEE, 2020) Zitouni, AbdelkaderPower transformer is vital element in power grid. Its failure may affect on the continuity of supply of electrical energy to the consumers. A differential relay, which is generally used for protecting this power transformer, may be affected by the disturbances such as inrush current, current transformer saturation and over-excitation due to external faults. Accordingly, false trips (mal-operation) of protection system may be resulted in. This research work proposes root cause analysis based on fault tree analysis to be used for assessing disturbances that lead to false trips. When the critical root causes are identified, mitigation measures are used. The model of security can help to quantify analytically the reliability of the considered protection systemItem 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.