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Speed Sensorless Control of a Doubly Fed Induction Motor Drives using MRAS Estimator
Djamila Cherifi,
Yahia Miloud
Issue:
Volume 4, Issue 1, June 2018
Pages:
1-12
Received:
25 December 2017
Accepted:
10 January 2018
Published:
23 February 2018
Abstract: In this paper, direct vector control by rotor flux orientation for doubly fed induction motor without mechanical sensor based on the MRAS estimator is discussed, this method consists in developing two models one of reference and the other adjustable for the estimation of the two components of the rotor flux from the measurement of currents, statoric and rotor voltages respectively, the speed estimated is obtained by canceling the difference between the rotor flux of the reference model and the adjustable one, while using the theory of hyperstability to obtain the adaptive mechanism the simulation results are presented to validate the proposed method.
Abstract: In this paper, direct vector control by rotor flux orientation for doubly fed induction motor without mechanical sensor based on the MRAS estimator is discussed, this method consists in developing two models one of reference and the other adjustable for the estimation of the two components of the rotor flux from the measurement of currents, statori...
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Effect of Annealing on the Structural and Magnetic Properties of 3% Sm Doped ZnO
Hanan Hassan Hantour,
Nadia Abd El-Mohsen,
Suzan Naser El-Sayed,
Assma Mahmoud Aoud Mahmoud
Issue:
Volume 4, Issue 1, June 2018
Pages:
13-20
Received:
28 December 2017
Accepted:
30 January 2018
Published:
26 February 2018
Abstract: The present study focuses on the structural and magnetic properties of Sm doped ZnO at 3% concentrations. These compounds have been synthesized by a chemical coprecipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and magnetization method (M– H). The XRD pattern of all the samples showed ZnO hexagonal wurtzite structure with sharp and intense peaks with small change in lattice parameters due to Sm doping in ZnO, indicating the substitution of Sm ion for Zn sites. Magnetic measurements show an enhancement in room temperature ferromagnetism (RTFM) with Sm doping. Ferromagnetic behavior exists over and above the diamagnetic behavior, RTFM related to The Zn vacancies and diamagnetic (which exists over alarge scale) related to the oxygen vacancies which mediate the interaction of dopant ions.
Abstract: The present study focuses on the structural and magnetic properties of Sm doped ZnO at 3% concentrations. These compounds have been synthesized by a chemical coprecipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and magnetization method (M– H). The XRD pattern...
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Coordination Improvement of Directional Overcurrent Relays in a Microgrid Using Modified Particle Swarm Optimization Algorithm
Ukwuoma Pious Akushie,
Adegboye Babatunde,
Tsado Jacob
Issue:
Volume 4, Issue 1, June 2018
Pages:
21-32
Received:
30 January 2018
Accepted:
16 February 2018
Published:
19 March 2018
Abstract: An accurate and fast relaying scheme is of high importance in a radial distribution network and it becomes complex to realize in a multi-sourced distribution network with Distribution Generators (DGs). The study of the existing relay coordination of the 33 kV Idu Industrial Park Distribution Network, Abuja and its improvement opportunities is presented in this research in other to guarantee safety of operation and protection of the distribution network against the effects of faults. A proposed 6 Bus Idu microgrid based on planned network expansion program was modeled using DIgSILENT PowerFactory software. Load Flow and Fault Analyses were performed on the modeled network to determine appropriate Directional Overcurrent Relay (DOCR) settings and a Modified Particle Swarm Optimization Algorithm (MPSO) in MATLAB environment was used to optimize the Time Dial (TD) and Pickup (PU) settings of the DOCRs. The modification adopted was to keep the solution space within boundaries so as to achieve fast convergence. The sum of the operating time of the radial feeder was found to be 3.68 s while that of the proposed 6 Bus Microgrid with 14 DOCRs and 3 DGs was found to be 3.7903s which was quite fast and satisfactory after validation on the modeled microgrid.
Abstract: An accurate and fast relaying scheme is of high importance in a radial distribution network and it becomes complex to realize in a multi-sourced distribution network with Distribution Generators (DGs). The study of the existing relay coordination of the 33 kV Idu Industrial Park Distribution Network, Abuja and its improvement opportunities is prese...
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Exploration of an Economic Photovoltaic River to Storage Pumping System Based on PVSyst Simulation
Md. Imran Hossain,
S. M. Raisul Islam
Issue:
Volume 4, Issue 1, June 2018
Pages:
33-44
Received:
2 February 2018
Accepted:
18 April 2018
Published:
17 May 2018
Abstract: Bangladesh is riverine country riddled with numerous rivers and canals. The country’s agriculture and overall rural life is centered on its water sources. Being a growing economy, the country is still hindered by power shortages. This paper is intended to simulate and propose a standalone photovoltaic river to storage pumping system for the rural areas of Bangladesh. Most of the farmers in the country irrigate their land using river water through manual labor which is cumbersome, time consuming and overall inefficient. The object of this research work is to develop a system that can draw water from the rivers and store into storage systems such as tanks. This research work was conducted purely through computer simulations. The proposed system for the modeling of the “River to Storage Pumping System” was simulated on PVSyst software. The simulations showed the overall potential of the initiative and the developed computational model of the system can be erected within an approximate $100 budget for each standalone system and has a potential to be an effective low cost support for the local agriculture as a standalone system independent from power grid.
Abstract: Bangladesh is riverine country riddled with numerous rivers and canals. The country’s agriculture and overall rural life is centered on its water sources. Being a growing economy, the country is still hindered by power shortages. This paper is intended to simulate and propose a standalone photovoltaic river to storage pumping system for the rural a...
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MPPT Control Method for Photovoltaic System Based on Particle Swarm Optimization and Bacterial Foraging Algorithm
Issue:
Volume 4, Issue 1, June 2018
Pages:
45-49
Received:
12 April 2018
Accepted:
27 April 2018
Published:
19 May 2018
Abstract: The P-V output feature of photovoltaic (PV) array presents multi-wave peaks under non-uniform illumination, so the traditional algorithm can not overcome the shortcomings of the local optimal value. In this paper, an optimization algorithm based on particle swarm and bacteria foraging is proposed, which is applied to the maximum power point tracking (MPPT) of PV arrays. The algorithm introduces the tendency operation to find the optimal solution in the local range. The replication operation is introduced to avoid the blind randomness of population update, and the convergence speed of the algorithm is accelerated. The migration operation is introduced to avoid the algorithm falling into the local optimal solution. The output power characteristics of PV array under occlusion are analyzed, and the MPPT control method experiment is carried out using bacterial foraging algorithm (BFA). Experimental results show that the algorithm can get rid of the constraint of local optimal value, quickly find the global maximum power point, and the control precision is high. It provides a new implementation method for PV array MPPT.
Abstract: The P-V output feature of photovoltaic (PV) array presents multi-wave peaks under non-uniform illumination, so the traditional algorithm can not overcome the shortcomings of the local optimal value. In this paper, an optimization algorithm based on particle swarm and bacteria foraging is proposed, which is applied to the maximum power point trackin...
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Robust Positive Position Feedback Controller for Voltage Control of Islanded Microgrid
Dristi Datta,
Md. Rafiqul Islam Sheikh,
Subrata Kumar Sarkar,
Sajal Kumar Das
Issue:
Volume 4, Issue 1, June 2018
Pages:
50-60
Received:
19 April 2018
Accepted:
8 May 2018
Published:
4 July 2018
Abstract: This paper presents the design of robust positive position feedback (PPF) controller to control the grid voltage for an islanded microgrid. The microgrid consists of several distributed generators (DG) and local loads which is partially unknown and uncertain. The controller is designed in a way that it shows the robustness against unmodeled loads, dynamic loads and harmonic loads. The dynamics of the plant is identified using differential equations. The design of the controller is presented based on negative imaginary approach. The simulation results presented in the paper show that the controller provides extensive improvement in the voltage control of islanded microgrid under different uncertainties.
Abstract: This paper presents the design of robust positive position feedback (PPF) controller to control the grid voltage for an islanded microgrid. The microgrid consists of several distributed generators (DG) and local loads which is partially unknown and uncertain. The controller is designed in a way that it shows the robustness against unmodeled loads, ...
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A Rainy Month Performance Evaluation of Photovoltaic Module and Performance Prediction of the PV Water Pumping Systems Under Soudano Sahelian Climate
Kodji Deli,
Noel Djongyang,
Donatien Njomo,
Dieudonné Kidmo
Issue:
Volume 4, Issue 1, June 2018
Pages:
61-71
Received:
21 May 2018
Accepted:
6 June 2018
Published:
1 August 2018
Abstract: The purpose of this paper is to evaluate the energy yield of the photovoltaic module during the worst case conditions in Soudano Sahelian climate in order to predict real time worst performance of a PV water pumping systems in two stations in soudano-sahelian zone of Cameroon. a simple model has been developed with experimental data of electrical energy delivered by PV module for estimating the performance of a photovoltaic (PV) water pumping systems, this work is made possible using 5-min intervals of measured performance data (ambient temperature, current, voltage) for the month of August using the optimum fixed tilt angle of the PV array. The method is validated by predicting the performance of two PV pumping systems installed in an isolated site in Agola and Dorigué. The daily and the monthly flow rate of the systems predicted by the method are evaluated.
Abstract: The purpose of this paper is to evaluate the energy yield of the photovoltaic module during the worst case conditions in Soudano Sahelian climate in order to predict real time worst performance of a PV water pumping systems in two stations in soudano-sahelian zone of Cameroon. a simple model has been developed with experimental data of electrical e...
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