-
Degradation Assessment of a Photovoltaic Plant After Several Years of Operation
Hawa Diatara Ndiath,
Pierre Williams Tavarez,
Serigne Thiao,
Awa Mar,
Amadou Tidiane Niang,
Babacar Mbow,
Issakha Youm
Issue:
Volume 6, Issue 1, March 2018
Pages:
1-7
Received:
2 February 2018
Accepted:
27 February 2018
Published:
28 March 2018
Abstract: This present study is an evaluation of the degradation of the electric characteristics of the photovoltaic modules of a solar power plant settled in the CERER after 3.3 years of operation. The Center of Studies and Researches on Renewable energy is an institute of Cheikh Anta Diop University of Dakar. It is situated in the district of Hann Bel Air. Since a few years; the CERER contributed a lot research of solutions to the problems of development bound to the energy and to the environment it is all the interest of this evaluation which aims at the improvement and at the planning of the photovoltaic systems. It is what explains the study of this evaluation which was proposed. Moreover the evaluation of the degradation of the solar power plant is centered on the global system, constituted by 18 polycristallins, all identical modules of type STP175P-1, connected in series. So we calculated the rates of degradation of the electric characteristics of modules after a few years of operation such as the characteristics I-V and P-V, the maximal power (Pmax), the maximal tension (Vmax), the maximal current (Imax), the tension in opened circuit (Voc), the current of short circuit (Icc) and the fill factor (FF) in the standard conditions of test (STC). The study of this global system allowed to take up respectively the rates of annual degradation of 2.01% / year, 1.69% / year, 0.34% / year, 1.1% / year and 0.9% / year for the power, the maximal tension, the maximal current, the current of short circuit, the tension in open circuit and the factor (mailman) of shape. We observed that the most degraded performances are: the maximal power, the maximal current, the current of short circuit and the fill factor; while the tension with open circuit shows no significant degradation during these 3.3 years of operation.
Abstract: This present study is an evaluation of the degradation of the electric characteristics of the photovoltaic modules of a solar power plant settled in the CERER after 3.3 years of operation. The Center of Studies and Researches on Renewable energy is an institute of Cheikh Anta Diop University of Dakar. It is situated in the district of Hann Bel Air....
Show More
-
Security of Cloud Virtualized Resource on a SaaS Encryption Solution
Chinedu Paschal Uchenna,
Nwankwo Wilson
Issue:
Volume 6, Issue 1, March 2018
Pages:
8-17
Received:
22 February 2018
Accepted:
9 March 2018
Published:
3 April 2018
Abstract: Protection of user data against data breaches in cloud applications and the potential security failures of the service providers coupled with heightened cloud user apprehension, have in no small degree defied measures taken to demystify cloud services as to unveil its enormous capacity and awesome benefits such as accessibility, availability, collaboration, to name a few. The security of the cloud infrastructure entails protecting cloud data from unauthorized access, preventing malicious programs from corrupting the virtual resource and ensuring the secure cloud data remains unintelligible to any unauthorized access or intrusion by malicious users. This paper is aimed at building a cryptographically secure cloud application environment. Its major objective is to design and implement an encryption system for protecting valuable data (such as passwords, messages, files) in the cloud environment. The design and implementation extended some basic security and privacy requirements including data confidentiality, integrity, and availability by considering fairness as a viable factor. This paper employed the Structured Systems Analysis and Design Methodology (SSADM) in the software development life. It evolves a novel cryptographically-secure cloud algorithm based on a proposed “Deciv Algorithm” tagged “D65- Enc” algorithm that would effectively hide meaningful user data from all external parties to a virtual network as well as the service provider by putting control in the hands of users. The algorithm is carefully crafted to frustrate any cryptanalyst, hacker or cybercriminal who would try to decipher the algorithm. This implementation is expected to assist cloud users in maintaining control over their data whether at rest or in transit within the cloud networks rather than outsource control to external vendors as usual. Moreover, this algorithm also improves the existing state of data privacy, and security in the cloud.
Abstract: Protection of user data against data breaches in cloud applications and the potential security failures of the service providers coupled with heightened cloud user apprehension, have in no small degree defied measures taken to demystify cloud services as to unveil its enormous capacity and awesome benefits such as accessibility, availability, colla...
Show More
-
Implementation of Distributed Fuzzy Load Control to an Autonomous Wind Diesel System
Hla Myo Tun,
Zaw Min Naing,
Win Khaing Moe,
Maung Maung Latt
Issue:
Volume 6, Issue 1, March 2018
Pages:
18-26
Received:
16 February 2018
Accepted:
7 March 2018
Published:
12 April 2018
Abstract: Many autonomous power systems are powered by diesel generators alone, which results in greater operating costs than interconnected grids. It is therefore desirable to integrate renewable energy sources such as wind into these mini grids. However, due to the fluctuating power generation from the wind resource, the varying load profile and the relatively low system inertia, technical difficulties arise in terms of system stability and efficient operation. Typically the penetration of wind energy on such systems is limited to 30%. Distributed intelligent load control can be used to increase wind penetration and cut diesel fuel consumption, whilst maintaining system stability. This thesis describes the development and application of a distributed intelligent load control system. The development of a self-tuning fuzzy controller and the construction of a laboratory wind-diesel test rig are discussed. The development of a dynamic Wind-Diesel computer model is also described. Finally the results of tests carried out on a Wind-Diesel system consisting of a 45kW stall regulated wind turbine and a 48kW diesel generator are discussed. The results were encouraging demonstrating that distributed fuzzy load control is a low cost and effective technique, which can be applied to small or large hybrid systems. The simulation results are developed by MATLAB.
Abstract: Many autonomous power systems are powered by diesel generators alone, which results in greater operating costs than interconnected grids. It is therefore desirable to integrate renewable energy sources such as wind into these mini grids. However, due to the fluctuating power generation from the wind resource, the varying load profile and the relati...
Show More
-
Determination of the Actual Amount of Insolation Absorbed by a Photovoltaic Panel (125w)
Rex Kemkom Chima Amadi,
Anthony Kpegele Leol
Issue:
Volume 6, Issue 1, March 2018
Pages:
27-30
Received:
2 March 2018
Accepted:
20 March 2018
Published:
14 April 2018
Abstract: The determination of the ability of the Photovoltaic cell in absorbing radiation was performed, taking into cognizance the fact that photovoltaic panels have the ability to harness solar energy incident on it in the form of radiation. It utilized the hourly production of open circuit voltage for a 125W module Photovoltaic panel made of silicon material. The solar panel was exposed to the open atmosphere from sunrise to sunset, precisely from 5.00am to 7.00am, with no obstruction from heights, high rise buildings and tall trees including towers. The photovoltaic panel was brought to ambient temperature and results were taken in clear sky weather condition in the neighborhood of ±10 minutes to the hour mark. The voltage output was recorded with the aid of a digital multimeter and a Power model was used to determine the actual amount of radiation available and a plot of voltage V hours and Watt V hour when done, showed the same pattern as that of Adnot, Haurwitz and Alboteani et al. results. The hourly variation of voltage graph when assessed, showed an ascendancy as the hour increased to a maximum of 20.65Volts at mid day and then a decrease to 0 volts at twilight (7.00pm) on the 11th day of November, 2017. The same ascendancy and decrease patterns were also displayed by the hourly variation of absorbed power. Thus, photovoltaic panel output varies with the sun hours like solar radiation varies with the sun hours, when results are obtained are obtained under stated conditions. Hence, results stands validated.
Abstract: The determination of the ability of the Photovoltaic cell in absorbing radiation was performed, taking into cognizance the fact that photovoltaic panels have the ability to harness solar energy incident on it in the form of radiation. It utilized the hourly production of open circuit voltage for a 125W module Photovoltaic panel made of silicon mate...
Show More
