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Computational Water, Energy, and Environmental Engineering 2021年第3期10卷 108-116页

作者： Regine Fouda Bella salomé ndjakomo essiane Simon Koumi Ngoh Boris Fouotsap Higher Technical Teacher’s Training College of Ebolowa University of Yaoundé I Yaoundé Cameroon Laboratory of Technology and Applied Sciences The University of Douala Douala Cameroo Laboratory of Electrical Engineering Mechatronics and Signal Processing University of Yaoundé I Yaoundé Cameroon

Photovoltaic cells are generally manufactured under standard test conditions. The operating conditions, very often induce performance losses different from those initially given by the manufacturer. This article presents an experimental acquisition and analysis system that integrates the synthetic efficiency ratio (SER) as a hybrid analysis tool to evaluate the performance of a monocrystalline photovoltaic solar panel, in this case the LW-MS90 panel in the city of Douala. The meteorological data obtained experimentally was used to evaluate these performances according to the manufacturer’s model in MATLAB/Simulink. By comparison with the experimental performances, the results quantify through a certain number of indices, a minimal power drop according to the acquired irradiance estimated at 3.45%. The interest of this approach is to contribute to the prediction of the operating performance of PV panels in the installation phase in non-standard areas.

关键词： Photovoltaic Panel Performance Synthetic Efficiency

Optimal Placement and Sizing of Distributed Energy Generation in an Electrical Network Using the Hybrid Algorithm of Bee Colonies and Newton Raphson

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Journal of Power and Energy Engineering 2020年第6期8卷 9-21页

作者： Fissou Filbert Amigue salomé ndjakomo essiane Steve Perabi Ngoffe Aristide Tolok Nelem Laboratory Technology and Applied Sciences University of Douala Douala Cameroon Laboratory of Applied Engineering and Biotechnology HTTTC of EBOLOWA University of Yaoundé 1 Yaoundé Cameroon

Distributed generation (DG) is gaining in importance due to the growing demand for electrical energy and the key role it plays in reducing actual energy losses, lowering operating costs and improving voltage stability. In this paper, we propose to inject distributed power generation into a distribution system while minimizing active energy losses. This injection should be done at a grid node (which is a point where energy can be injected into or recovered from the grid) that will be considered the optimal node when total active losses in the radial distribution system are minimal. The focus is on meeting energy demand using renewable energy sources. The main criterion is the minimization of active energy losses during injection. The method used is the algorithm of bee colony (ABC) associated with Newtonian energy flow transfer equations. The method has been implemented in MATLAB for optimal node search in IEEE 14, 33 and 57 nodes networks. The active energy loss results of this hybrid algorithm were compared with the results of previous searches. This comparison shows that the proposed algorithm allows to have reduced losses with the power injected that we have found.

关键词： Optimization Distributed Power Generation Bee Colony Algorithm Newton Raphson

Hydropower Production Optimization from Inflow: Case Study of Songloulou Hydroplant

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Journal of Power and Energy Engineering 2020年第8期8卷 37-52页

作者： Daniel Eutyche Mbadjoun Wapet salomé ndjakomo essiane René Wamkeue Patrick Juvet Gnetchejo Laboratory of Electrical Engineering Mecatronic and Signal Treatment National Advanced School of Engineering University of Yaounde 1 Yaoundé Cameroon Higher Technical Teacher Training College of Ebolowa University of Yaounde 1 Yaounde Cameroon School of Engineering University of Quebec in Abitibi-Temiscamingue (UQAT) Rouyn-Noranda Canada Laboratory of Technologies and Applied Sciences University of Douala Douala Cameroon

The model of nonlinear power generation function is developed to generate optimal operational policies for Songloulou inflow in Cameroon and test these policies in real time conditions. Our model is used to adjust operational regimes for the Songloulou reservoir under varying flows (turbined and deversed) using a dynamic program. A more interesting approach, proposed in this article, consists of combining both the principle of decomposition by resources (or quantities) and the technique of dynamic programming. Dynamic programming is an appropriating optimization algorithm that is used for complex non-linear inflow operational policies and strategies. In this case study, our optimization model is used and confirmed maximizing large scale of hydropower in a period of time step by the integration of several. The high non linearity of our study object is the first stage of difficulty which brought us to combined least squared and Time Varying Acceleration Coefficients Particle Swarm (TVACPSO) to obtain appropriate production function which generated optimal operational policies for the Songloulou hydropower in sub-Saharan region and after we tested it in the company policies operational at real time conditions. The model could be successfully applied to other hydropower dams in the region.

关键词： Hydropower Reservoir Optimization Simulation Dynamic Programming

Control of an Active Filter by Duty Cycle Modulation (DCM) for the Harmonic Decontamination of a Three-Phase Electrical Network

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Journal of Power and Energy Engineering 2020年第7期8卷 1-14页

作者： Théodore Patrice Nna Nna salomé ndjakomo essiane Stève Pérabi Ngoffé Technology and Applied Sciences Laboratory University of Douala Douala Cameroon

This paper presents the control of the active filter by Duty Cycle Modulation (DCM) for the harmonic pollution control of a three-phase electrical system. Several research works have preceded this work, but most of them deal with the control by pulse-width modulation and the differences lie around the THD reduction performance, the quality of the wave obtained, the simplicity of the scheme and the cost of the control. For this purpose, we propose a very innovative approach to active filter control which aims at reducing the current THD at a lower rate than pulse-width modulation techniques improving at the same time the wave quality with a more simplified control scheme. First we present the schematic diagram of the active filter, then we present the design of the control of this active filter based on the real and imaginary instantaneous power method which uses the algebraic “Clark” transformation. The Duty Cycle Modulation controller is used to obtain the required control commands to be injected to the inverter. We then developed a simulink model of the active filter to validate this study. The simulations were performed in the Matlab/Simulink environment. The results obtained show a significant improvement on the harmonic current control techniques for the THD of 1.02% which was 26.25%, the elimination of noise in the signal and the simplicity of the control with an easier implementation than the pulse width modulation (PWM) make the Duty Cycle Modulation (DCM) control a very promising tool.

关键词： PWM DCM Active Filter Inverter

Enhanced Vibrating Particles System Algorithm for Parameters Estimation of Photovoltaic System

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Journal of Power and Energy Engineering 2019年第8期7卷 1-26页

作者： Patrick Juvet Gnetchejo salomé ndjakomo essiane Pierre Ele René Wamkeue Daniel Mbadjoun Wapet Steve Perabi Ngoffe Laboratory of Technologies and Applied Sciences University of Douala Douala Cameroon Higher Technical Teacher Training College of Ebolowa University of Yaoundé Yaoundé Cameroon Electrical Engineering and Telecommunications Department National Advanced School of Engineering University of Yaoundé Yaoundé Cameroon School of Engineering University of Quebec in Abitibi-Temiscamingue (UQAT) Rouyn-Noranda QC Canada

To evaluate the performance of a photovoltaic panel, several parameters must be extracted from the photovoltaic. These parameters are very important for the evaluation, monitoring and optimization of photovoltaic. Among the methods developed to extract photovoltaic parameters from current-voltage (I-V) characteristic curve, metaheuristic algorithms are the most used nowadays. A new metaheuristic algorithm namely enhanced vibrating particles system algorithm is presented here to extract the best values of parameters of a photovoltaic cell. Five recent algorithms (grey wolf optimization (GWO), moth-flame optimization algorithm (MFOA), multi-verse optimizer (MVO), whale optimization algorithm (WAO), salp swarm-inspired algorithm (SSA)) are also implemented on the same computer. Enhanced vibrating particles system is inspired by the free vibration of the single degree of freedom systems with viscous damping. To extract the photovoltaic parameters using enhanced vibrating particles system algorithm, the problem can be set as an optimization problem with the objective to minimize the difference between measured and estimated current. Four case studies have been implemented here. The results and comparison with other methods exhibit high accuracy and validity of the proposed enhanced vibrating particles system algorithm to extract parameters of a photovoltaic cell and module.

关键词： PV Cell Modeling Vibrating Particles System Parameter Estimation Single/Double Diode Model

Variability of Performance Indices of Photovoltaic Solar Panels in Operating Conditions in the Littoral Zone of Cameroon

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Contribution to the Optimization of the Transient Stability of an Electric Power Transmission Network Using a Universal Power Flow Compensator Controlled by a Three-Stage Inverter

Computational Water, Energy, and Environmental Engineering（水能与环境工程） 2021年第3期

作者： Regine Fouda Bella salomé ndjakomo essiane Simon Koumi Ngoh Boris Fouotsap

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World Journal of Engineering and Technology 2020年第4期8卷 675-688页

作者： Koko Koko Joseph Nneme Nneme Léandre ndjakomo essiane salomé Laboratory of Computer and Automatic Engineering UFD of Engineering Sciences ENSET University of Douala Douala Cameroon Higher Normal School of Technical Education ENSET of EBOLOWA University of Yaoundé Yaoundé Cameroon

The use of an electrical network as close as possible to its limits can lead to its instability in the event of a high amplitude disturbance. The damping of system oscillations can be achieved by conventional means of voltage and speed regulation but also by FACTS (Flexible AC Transmission Systems) devices, which are increasingly used in power networks. In this work, optimal control coordination between a hybrid power flow controller and a three-level inverter was used to improve the transient stability of a transmission line. The UPFC is a combination of a serial compensator (SSSC) and a parallel compensator (STATCOM) both connected to a DC-LINK DC bus. The SSSC acts as a voltage source for the network and injects a voltage that can be adjusted in phase and amplitude in addition to the network voltage;the STATCOM acts as a current source. The approach used is tested in the Matlab Simulink environment on a single machine network. Optimal controller tuning gives a better transient stability improvement by reducing the transport angle oscillations from 248.17% to 9.85%.

关键词： FACTS UPFC Three-Stage Inverter PI Power Transit Transient Stability

A Simple Predictive Performance Model of Solar Cell under Very Hot and Humide Climate

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Journal of Power and Energy Engineering 2019年第5期7卷 26-47页

作者： Mougang Yolande Christelle Ketchanji essiane salomé ndjakomo Imano Adolphe Moukengue Laboratory Technology and Applied Sciences University of Douala Douala Cameroon

In the scope of solar energy-based electrical needs in rural tropical regions, the present article develops and confronts experimental power models from the using of manufacturer data and a new model made with the meteorological and electrical data acquired. These data are registered through an acquisition station around a monocrystalline photovoltaic panel, designed and realized in the scope of this work. After the acquisition of meteorological data, a choice of the most relevant meteorological variable as input vectors to express the output powers obtained was carried out. Around the Single-Diode model, seven models are performed with analytics equations, iterative methods and an optimization method with a multi-objective function to get internal parameters. The proposed experimental model is made by a combination of the solution got at STC of an iterative method, with the value of nameplate and the use of an open circuit voltage equation with experimental coefficient to predict power output in operating conditions, and it’s demonstrated more efficient. The optimization of a multi-objective function using Nonlinear Squares (NLS) through the Leveng-Marqued method to solve the parameter estimation of a PV panel has been well done and the results are useful, like classic iterative method and less time-consuming.

关键词： Experimental Modelling Maximal Power Output (MPO) Photovoltaic (PV) 1M5P

Comparative Analysis of Hybrid Controllers of Done Systems (UPFC) and Interphase Power Regulators Type RPI 30p15 on Contingency Management in Electrical Networks

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World Journal of Engineering and Technology 2021年第3期9卷 708-726页

作者： Koko Koko Joseph Nneme Nneme Léandre ndjakomo essiane salomé Batassou Guilzia Jeannot Laboratory of Computer and Automatic Engineering UFD of Engineering Sciences ENSET University of Douala Douala Cameroon Higher Normal School of Technical Education ENSET of EBOLOWA University of Yaoundé 1 Yaoundé Cameroon

The aim of this work is to demonstrate that interphase power regulators (IPR) bring new and interesting ultra-solutions that complement those already taken into account by the FACTS (Flexible Alternative Transmission System) in the resolution of the problems related to the power flow in the AC transmission networks. In order to facilitate the understanding of this work, a comparative study of the performances of the two technologies between the UPFC (Unified Power Flow Controller) and RPI was carried out and at the end of which we were able to highlight the preponderance of RPI compared to the UPFC in the bypassing of the short-circuit fault insofar as the latter allows, in particular, an increase in the transformation capacity without an increase in the level of the short-circuit. The decoupled watt-var method has been used to control the UPFC while the RPI is controlled by phase shift. The simulation results are obtained in the Matlab Simulink environment and show the flexibility of the RPI compared to the UPFC in limiting strong contingencies.

关键词： Transmission Line High Contingency FACTS PST TCPST UPFC Three-Leg RPI 30P15 Phase-Shifting Transformer Modeling

Peregrine Soliton and Akhmediev Breathers in a Chameleon Electrical Transmission Line

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Journal of Applied Mathematics and Physics 2020年第12期8卷 2775-2792页

作者： Bedel Giscard Onana Essama salome ndjakomo essiane Frederic Biya-Motto Bibiane Mireille Ndi Nnanga Mohammed Shabat Jacques Atangana Applied Biotechnology and Engineering Laboratory Department of Electrical Engineering Higher Technical Teachers Training College (HTTTC) of EBOLOWA University of Yaounde I Yaounde Cameroon Laboratory of Electronics Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon Laboratory of Mechanics Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon Department of Physics Islamic University of Gaza Gaza Palestine Higher Teacher Training College of Yaounde University of Yaounde I Yaounde Cameroon

We analyze the particular behavior exhibited by a chaotic waves field containing Peregrine soliton and Akhmediev breathers. This behavior can be assimilated to a tree with “roots of propagation” which propagate randomly. Besides, this strange phenomenon can be called “tree structures”. So, we present the collapse of dark and bright solitons in order to build up the above mentioned chaotic waves field. The investigation is done in a particular nonlinear transmission line called chameleon nonlinear transmission line. Thus, we show that this line acts as a bandpass filter at low frequencies and the impact of distance, frequency and dimensionless capacitor are also presented. In addition, the chameleon’s behavior is due to the fact that without modifying the appearance structure, it can present alternatively purely right- or left-handed transmission line. This line is different to the composite one.

关键词： Freak Waves Generation Transmission Line Metamaterials Right/Left-Handed Behaviors Tree Structures Collective Coordinates