Comparative Study of the Voltage Stability of an Hight Voltage Power Grid: Case of the Power Grid of the Electric Community of Benin
Yao Bokovi,
Comlanvi Adjamagbo,
Adekunle Akim Salami,
Ayite Sena Akoda Ajavon
Issue:
Volume 8, Issue 2, June 2020
Pages:
15-24
Received:
4 August 2020
Accepted:
24 August 2020
Published:
7 September 2020
Abstract: The voltage profile at the buses of an higth voltage power grid makes it possible to predict the voltage stability of said power grid in order to guarantee production-consumption adequacy. The study presented in this paper is initially restricted to the variation of the active power demand of a consumption bus (PQ) in order to obtain the voltage profile of the entire electricity transmission network. Then, it makes it possible to predict the limit of the maximum increase in power demand at a PQ bus with the corresponding voltage level of all the other buses in order to anticipate the instability of the voltages liable to cause the collapse of the network. Finally, to correct the voltage levels linked to the observed instability, the study proposes the comparison by voltage sensitivity factors of two types of compensation such as shunt compensation and compensation by adding reactance to the line. transmission. The Newton-Raphson method coupled with Predictor-Corrector methods was used for the Continuation Power Flow (CPF) on the electricity transmission network of the Benin Electric Community (CEB). The results from the bus voltage profile curves for the case of the CEB power grid have shown that the two types of compensation make it possible to recover the lost voltage stability. However, shunt compensation is best due to its lower voltage stability sensitivity factor. This study has the advantage of allowing the power grid operator to anticipate the instability of the tensions in the power grid in order to avoid its collapse. It thus helps the manager to properly plan the voltage stability of his power grid.
Abstract: The voltage profile at the buses of an higth voltage power grid makes it possible to predict the voltage stability of said power grid in order to guarantee production-consumption adequacy. The study presented in this paper is initially restricted to the variation of the active power demand of a consumption bus (PQ) in order to obtain the voltage pr...
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Modeling of Thin-layer Sun Drying of Slices of Meat in Kilishi Form
Aboubacar Chaibou Aouta,
Haoua Amadou,
Eloi Salmwendé Tiendrebeogo
Issue:
Volume 8, Issue 2, June 2020
Pages:
25-32
Received:
6 August 2020
Accepted:
24 August 2020
Published:
7 September 2020
Abstract: The sun-drying method is one of the methods used to dry kilishi in Niger and throughout Sub-Saharan Africa. It is a purely traditional process, which only requires the knowledge of the butcher. The objective of our work consists of, on the one hand, the evaluation study of the drying in the sun in a thin layer of slices of meat in the form of kilishi, in typically Sahelian climatic conditions and, on the other hand, the study of mathematical modeling of the physical process which takes place during this drying. The methodological approach consists in establishing a mathematical model, which predicts the thermal and mass balance of the product during the drying process and validates this model with an experimental test. The equations of the mathematical model governing the drying system are solved by the numerical method of Runge - Kutta in the 4th order. The results of the sun-drying evaluation study made it possible to determine the temperature evolution of the upper and lower side of the meat slices in kilish form, during the entire drying process. The monitoring of the loss of masses of the slices of meat allowed us to determine experimentally the water content as a function of time and the drying rate as a function of the water content. The comparison of the results of the numerical simulation of the mathematical model and those recorded experimentally are consistent. The relative errors between the simulation results and the experimental results are given by the statistical parameters R2, MSE and RMSE. We have obtained for the set of values of R2 close to one (1) and MSE, RMSE close to zero (0). This allowed us to conclude that the model is satisfactory.
Abstract: The sun-drying method is one of the methods used to dry kilishi in Niger and throughout Sub-Saharan Africa. It is a purely traditional process, which only requires the knowledge of the butcher. The objective of our work consists of, on the one hand, the evaluation study of the drying in the sun in a thin layer of slices of meat in the form of kilis...
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