International Journal of Energy

ISSN: 1998-4316
Volume 13, 2019

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 13, 2019

Title of the Paper: IoT based System of Energy Compensation in Smart Power Grid


Authors: Abdelkader Zitouni, Hamid Bentarzi

Pages: 85-89

Abstract: In this research work, a new approach of energy compensation system using IoT in smart grid has been proposed. Where, multi-agents that can communicate with each other to share information are used, distribute energy and control the voltage level. Multi-agents make the link between flexible resources. They are an emerging technology for decentralized computation and data storage, secured by a distributed consensus mechanism. For testing this approach, a standard IEEE 9 bus power grid has been used that gives a good result.

Title of the Paper: Statistical Support System for Asset Management in Power Transmission Systems


Authors: Renato P. Bossolan, Bruno A. Trevisam, Ivan Nunes da Silva, Rogério A. Flauzino, Luisa H. B. Liboni, Danilo H. Spatti

Pages: 80-84

Abstract: The asset management in power transmission systems are one of the great issues in the current maintenance procedures carried out by power companies. With the aging of the devices, the development of optimized tools, capable of considering failure rates and regulatory/operational parameters, is increasingly mandatory. The purpose of this work is to present a statistics-based tool for optimized asset management.

Title of the Paper: Facilitating On-Line Harmonic Estimation based on Robust Adaptive RBFNN


Authors: Eyad K. Almaita, Jumana Al Shwawreh

Pages: 75-79

Abstract: In this paper, An adaptive Radial Basis Function Neural Networks (RBFNN) algorithm is used to estimate the fundamental and harmonic components of nonlinear load current. The learning rates for adaptive RBFNN are further investigated to minimize the total error and to minimize the error in each of the fundamental and harmonics components. The performance of the adaptive RBFNN is evaluated based on the difference between the original signal and the constructed signal (the summation between fundamental and harmonic components). The methodology used in this paper facilitates the development and design of signal processing and control systems. This is done by training the system and obtaining the initial parameters for the RBFNN based on simulation. After that, the adaptive RBFNN can be in the real system with these initial parameters.

Title of the Paper: DC Link Voltage and Power Flow Control of a Doubly Fed Induction Generator in Wind Power System


Authors: Milkias Berhanu, Roberto Leidhold

Pages: 69-74

Abstract: Doubly Fed Induction Generator (DFIG) is the most commonly used type of induction generators nowadays in wind power industry where it is connected with grid directly through its stator and via dual-back-to-back converters through the rotor. This paper focuses on its modeling and control of DC link voltage and the power flow between the generator and the grid. The effects of load current transients and reactive power changes are analyzed. To meet the target, the machine side converter (MSC) is modeled to regulate the stator active and reactive power whereas the grid side converter (GSC) ensures the regulation of the DC link voltage. The pulse-width modulation (PWM) strategy is used to control the two converters in dq frames. PI controllers are designed and applied in two reference frames: one oriented with the stator flux and the other with grid voltage, for the MSC and GSC respectively. MATLAB-Simulink software is used for modelling, simulation, and control.

Title of the Paper: MPPT Algorithm for  a PV Array Fed BLDC Motor Driven Air Conditioning System


Authors: S. Munisekhar, G. V. Marutheswar, P. Sujatha, K. R. Vadivelu

Pages: 61-68

Abstract: The fastest and novel adaptive voltage reference MPPT tracking algorithm for PV cluster sustained BLDC drive for aerating and cooling application is proposed in this paper. The fastest maximum power point tracking (MPPT) algorithm tracks the power instantaneously if there is any change in the solar irradiation. Low cost and energy efficiency is achieved by removing the conventional DC/DC boost converter stage which reduces the switching losses and further reduces the overall cost of the system thereby minimizing the power conversion stages. The proposed quickest MPPT algorithm for BLDC motor driven PV array fed air conditioning system is designed and modelled such that the performance is not affected even under the dynamic conditions. The proposed system is validated by simulation studies.

Title of the Paper: A Review of Commutation Problem in Matrix Converter


Authors: Farshad Soltanian

Pages: 51-60

Abstract: Matrix converters have attractive features including their high density power and bidirectional power flow. One of the challenges of matrix converter is commutation problem. Commutation problem in matrix converter is more complex than other common converters such as AC-DC-AC converters because there isn't any natural free – wheeling path in matrix converters. In this article, different commutation methods have been considered and compared with each other such as current sign based commutation which is a base method in these converters, voltage based commutation that decreases commutation time and improved the waveforms ,and commutation circuits that it has different circuits itself that they don't need to determine the sign of current. The simulation of two methods have been proposed and compared with each other.

Title of the Paper: VGPI Control of Multilevels STATCOM


Authors: Hamza Tédjini, Messaoud Fatima Zahra

Pages: 45-50

Abstract: In this paper a synchronous compensator (STATCOM) based multilevels converter is used is to compensate of a power network. The STATCOM when it is under a very complex structure state such as the nine levels NPC topology may suffer from the association of many capacitors at the DC link bus. The variable gain PI controller (VGPI) is introduced to improve stability of the DC link bus.

Title of the Paper: Cooling and Heating with Ground Source Energy


Authors: A. Omer

Pages: 40-44

Abstract: Geothermal heat pumps (GSHPs), or direct expansion (DX) ground source heat pumps, are a highly efficient renewable energy technology, which uses the earth, groundwater or surface water as a heat source when operating in heating mode or as a heat sink when operating in a cooling mode. It is receiving increasing interest because of its potential to reduce primary energy consumption and thus reduce emissions of the greenhouse gases (GHGs). The main concept of this technology is that it utilises the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The main goal of this study is to stimulate the uptake of the GSHPs. Recent attempts to stimulate alternative energy sources for heating and cooling of buildings has emphasised the utilisation of the ambient energy from ground source and other renewable energy sources. The purpose of this study, however, is to examine the means of reduction of energy consumption in buildings, identify GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promote using GSHPs applications as an optimum means of heating and cooling, and to present typical applications and recent advances of the DX GSHPs. The study highlighted the potential energy saving that could be achieved through the use of ground energy sources. It also focuses on the optimisation and improvement of the operation conditions of the heat cycle and performance of the DX GSHP. It is concluded that the direct expansion of the GSHP, combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors, is extendable to more comprehensive applications.

Title of the Paper: Power Distribution Networks’ Critical Infrastructure Monitoring and Service Restoration through Cloud Computing for Reliability and Efficiency Improvement


Authors: Aderonke O. Akinwumi, Olusola A. Komolafe, Solomon O. Odewo

Pages: 32-39

Abstract: The reliability of power supply is the greatest concern of any electric utility company. From inception till now power system engineers have always been concerned with supplying electricity to the loads reliably and efficiently. This may be realized by striking a balance between customer satisfaction and the associated expenses. Nowadays, electric power systems (up to transmission level) are being upgraded with sophisticated communication and control technologies to enhance the system reliability, however poor monitoring gives rise to uncertainties on the distribution portion of the total power system. These uncertainties when introduced in the power grid affect the overall reliability and efficiency of the system. Therefore, it is critical to develop models and methods to improve monitoring and protection of the distribution system thereby improving power system reliability. This paper treats a two-fold objective. First, the load on low/medium voltage feeders and distribution transformers are monitored and next both pre-fault and fault conditions are detected and isolated thereby restoring normalcy. This work therefore designed an automatic system for remote monitoring and balancing of load on each feeder. Remote actions were done through automatic sensors, isolators and switches which opened or closed depending on the status of individual feeders as detected by the sensing circuits. Data processing for actionable outputs in a virtual control room was then realized through cloud computation. This paper gives a projection that will lead to improvement in stabilizing the distribution network through the reduction of total downtime and its impact.

Title of the Paper: Comparative Analysis of Thermoelectric Generators Parameters


Authors: M. Bensaada, M. Bekhti, S. Della Krachai, F. Metehri, M. Beldjehem

Pages: 28-31

Abstract: Other sources of energy in space applications remain unexploited such as heat. Indeed the exchange of heat is considered generally on board spacecraft as hostile, destructive and undesirable, thereby a different means are used to reduce its effect on board spacecraft. Heat being an important source of energy, it remains badly exploited on spacecraft and its applications remain limited. We present in this paper one of the methods used to convert heat energy to electrical energy by using thermoelectric device, the goal becomes therefore to choose a device capable to give a best performances through a comparative analysis between different commercial thermoelectric generator devices to be able subsequently to make a choice of the component to be used for future design. This analysis will allow us thereafter to design a thermoelectric generator as secondary power source for small satellite by exploiting the external thermal properties of the spacecraft on orbit.

Title of the Paper: Effect of SSSC in Compensation of Multi-machine Perturbed Network


Authors: Messaoud Fatima Zahra, Hamza Tédjini, M. O. Benali

Pages: 22-27

Abstract: The synchronous series static compensator SSSC is one of the FACTS devices able to act not only on the reactive power, but also on the active power which makes it possible to improve the stability of the electrical networks by the management of the flows of power transiting the lines. Indeed, consisting of a pulse inverter connected in series with the transmission line, it is able to inject a variable voltage in module and phase on the network and thus contribute to managing the power flows. In this paper we will examine the effect of using a SSSC to improving the stability of IEEE 14 bus perturbed network.

Title of the Paper: Multilevel Inverter Design using Coupled Inductor with Improved Performance


Authors: Md. Tanvir Sadiq, Ken Fahmidur Rahman, M. A. Munaim Hossain, Mohammad. Jahangir Alam

Pages: 18-21

Abstract: This paper proposes a novel multilevel inverter design based on improvement of Total Harmonic Distortion and power efficiency corresponding to the reduction of diodes and capacitors from traditionally used topology as well as switching loss of the system. The proposed topology uses split coil coupled inductor and its mutual inductance property in order to produce 6-switch 7-level voltage output. IGBT switching is implemented in the inverter to produce a fundamental 50Hz output signal with reduced THD and power efficiency. Simulations are done using MATLAB-SIMULINK to validate the design and the expected outcomes. This proposed inverter is expected to be highly efficient if implemented for microinverter applications due to its compactness and loss reduction.

Title of the Paper: Enhanced Performance of Developed Two-Step (Hybrid/PMU) Linear State Estimator Model


Authors: Shaymaa M. Khamis

Pages: 11-17

Abstract: This paper proposes a novel hybrid state estimation method. In traditional EMS (Energy Management System), the ordinary hybrid state estimation technique employs both conventional measurements from the SCADA (Supervisory Control and Data Acquisition) and PMU (Phasor Measurements Unit) measurements in the state estimation software. Alternatively PMU measurements can be added through a post-processing or pre-processing step with the results of traditional state estimator to obtain the final estimation results. While this paper presents a new two-step (hybrid/PMU) algorithm where the first step adopts a hybrid state estimation SCADA/PMU and the second step is a linear state estimation comprises PMU measurements and the state vector resulting from the first step; consequently a double hybridization is achieved. Alexandria (330 km north Cairo, Egypt) 22 -bus system is used as case study. The simulation results demonstrate that the proposed algorithm enhances the precision and accuracy of state estimation greatly because the PMU measurements hybridize in two successively steps. Better dynamic behavior as compared with other state estimators is obtained.

Title of the Paper: Real-time FPGA Implementation of the DTC Power Control for DFIG-Generators Applied to Wind Turbines


Authors: Badre Bossoufi

Pages: 1-10

Abstract: In this paper we develops a new control strategy for extracting and controlling the power of the Doubly-FedInduction Generator (DFIG) applied to wind turbines. A newcontribution for the regulation of the active and reactive poweris presented, with the aim of an injection to the distributionnetwork. The proposed model in this paper is based on directtorque control (DTC), which is based on performanceestimators to improve the quality of the system. The energyquality genered by wind system will be injected into thedistribution network according to international standards.Finally, the results of the real-time implementation of thecontrol are implemented on the Matlab / Simulink XilinxSystem Generator environment. The entire wind turbinesystem has been tested in laboratory conditions using the testbench. Simulation and experimental tests show the highdynamic performance and robustness of the proposed control.