J. of Electrical Engineering最新文献

{"title":"An Assessment of Renewable Energy Options for Somalia Turkey Hospital","authors":"Bahtiyar Dursun, S. Dursun, Ercan Aykut","doi":"10.17265/2328-2223/2020.01.005","DOIUrl":"https://doi.org/10.17265/2328-2223/2020.01.005","url":null,"abstract":"Somalia Mogadishu-Turkey Training and Research Hospital is only powered by diesel generator currently. In this paper, the energy demand of this hospital is supplied by determining the optimum hybrid power renewable generating system. Therefore, numerous hybrid renewable power generating systems including the components like diesel generator, wind turbine, photovoltaic (PV) and battery are considered in different configurations. Eventually, they are technically, environmentally and economically analyzed by using the well-known HOMER software. Furthermore, a sensitivity analysis is also performed considering variations in three important parameters, namely average wind speed, current diesel price and also solar radiation. According to the results, the optimal system is the standalone Wind/Diesel/Battery hybrid renewable energy system (HRES) with the configuration of 1,000 kW wind turbine, 350 kW diesel generator, 250 kW power converters and 750 batteries. Additionally, this system has the net present cost of $5,056,700 as well as the cost of energy as $0.191/kWh. Lastly, it is clearly occurred that the Wind/Diesel/Battery HRES is eco-friendlier than other HRESs.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127920474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detecting Deterioration Stages in Epoxy Resins Specimens under Partial Discharge Process","authors":"Cristian R. Bonini, Marcos U. Maillot, F. Pessana","doi":"10.17265/2328-2223/2019.02.001","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.02.001","url":null,"abstract":"This paper presents a novel analysis tool based on partial discharge (PD) pulses waveform to determinate deterioration process as the fault evolves carbonizing the insulating medium in epoxy resin specimens. The PD pulses were acquired in the laboratory under controlled conditions; specially designed specimens were tested with a tip-flat electrode configuration immersed in a thermostable polymer (epoxy resin). Then, in the processing step, all acquired PD pulses were characterized with the Shannon entropy, and its variations along the deterioration process were studied. It was observed that the dispersion of this quantity increases with the deterioration of the medium, which allowed identifying different deterioration stages. The evolution of the deterioration has a correlation with the appearance of a greater number of pulses, whose entropy values diverge from average value (close to 2). These new pulses were analyzed using signal processing tools. It was found that there are important differences in the spectral content of each family, in the time-scale characteristics and in the energy distribution of the same frequency bands corresponding to each pulses family. In this work, the deterioration of epoxy resin specimens was characterized throughout the modifications observed in the characteristics of PD pulses during the entire failure process. It could be verified that there is information about the deterioration of the medium contained in the characteristics of the analyzed pulses.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132772111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Plus Type DVCC-Based Current-Mode Biquad","authors":"T. Tsukutani, N. Yabuki","doi":"10.17265/2328-2223/2019.02.002","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.02.002","url":null,"abstract":"This paper presents a novel current-mode biquad using only plus type DVCCs (differential voltage current conveyors). The circuit enables LP (low-pass), BP (band-pass), HP (high-pass), BS (band-stop) and AP (all-pass) responses by the selection and/or addition of the circuit currents with no component matching constraints. Moreover the circuit parameters ω0 and Q can be set orthogonally adjusting the circuit components. An achievement example is given together with simulation results by PSPICE.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122076102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal Design and Simulation of Solar Photovoltaic Powered Cathodic Protection for Underground Pipelines in Libya","authors":"Mustafa, A.Al-Refai","doi":"10.17265/2328-2223/2019.02.004","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.02.004","url":null,"abstract":"In Libya, pipelines are being used as means of transferring hydrocarbon from wellheads to export sea ports, refineries, storage tanks, steel factory and power plants. Steel pipeline is widely used because it is the safest means of transporting hydrocarbon and other oil products as well as its cost effective. However, one of the challenges facing oil and gas sector is corrosion on infrastructure facilities and processing units. Cathodic-protection (CP) is an electrical method used to protect metallic body in contact with the earth from corrosion. A photovoltaic (PV) provides a reliable solution for powering remote CP stations, enabling the placing of CP units in any location along the underground pipeline, thus ensuring optimal current distribution for the exact protection requirements. In this paper the sizing of the system is determined based on the electrical power needed for the catholic protection, characteristics of the used PV module and the meteorological data of the installation site. Matlab/Simulink and PVsyst V6.43 software are used as tools for optimal design, sizing and simulation of the PV powered cathodic protection system components. In addition to that estimation of system cost was investigated and compared with the conventional system. The results show that using solar energy powered cathodic protection system for underground pipelines is practical and very beneficial besides being economical, especially considering the rapid decreasing in the prices of PV systems components and the increasing of its efficiencies and reliability.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132714750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Factors Affecting Energy Efficiency Investments—A Case Study of Bhutan","authors":"R. Chhetri, Young-Ho Lee, D. Robinson, S. Pokhrel","doi":"10.17265/2328-2223/2019.02.003","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.02.003","url":null,"abstract":"Abstract Energy efficiency is providing the same services consuming less energy. Less energy means less energy bill and less greenhouse emissions. Bhutan presents a unique scenario in promoting the use of energy efficiency equipment and investments. Bhutan enjoys availability of adequate low cost hydropower energy resource that is green and clean and enjoys cheap electrical energy. To aggravate the situation, the domestic tariffs are subsidized and even free up to 100 units in rural parts of the country. Export tariffs are determined independently according to entirely different principles. However for cooking, Bhutan imports LPG (Liquefied Petroleum Gas) from India. With increasing threats of climate change, it is reported water flow in rivers is decreasing. For energy security and related socio environmental issues, prospects of energy supply constraints and increasing demand of quality power in the country, there is a need to take appropriate policy measures which would lead to the development of indigenous, local and dispersed clean energy sources in the future. When a customer is asked to retrofit the house with energy efficiency, the owner questions oneself if the available investment resources are being directed to an effective return. Various criteria are available but all can not to be considered to come to a final decision. This paper presents an overview of many factors which affect energy efficiency investment in building in Bhutan. Abstract: Energy efficiency is providing the same services consuming less energy. Less energy means less energy bill and less greenhouse emissions. Bhutan presents a unique scenario in promoting the use of energy efficiency equipment and investments. Bhutan enjoys availability of adequate low cost hydropower energy resource that is green and clean and enjoys cheap electrical energy. To aggravate the situation, the domestic tariffs are subsidized and even free up to 100 units in rural parts of the country. Export tariffs are determined independently according to entirely different principles. However for cooking, Bhutan imports LPG (Liquefied Petroleum Gas) from India. With increasing threats of climate change, it is reported water flow in rivers is decreasing. For energy security and related socio environmental issues, prospects of energy supply constraints and increasing demand of quality power in the country, there is a need to take appropriate policy measures which would lead to the development of indigenous, local and dispersed clean energy sources in the future. When a customer is asked to retrofit the house with energy efficiency, the owner questions oneself if the available investment resources are being directed to an effective return. Various criteria are available but all can not to be considered to come to a final decision. This paper presents an overview of many factors which affect energy efficiency investment in building in Bhutan.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132301523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Training of Multi-layered Neural Network for Data Enlargement Processing Using an Activity Function","authors":"Betere Job Isaac, H. Kinjo, K. Nakazono, Naoki Oshiro","doi":"10.17265/2328-2223/2019.01.001","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.01.001","url":null,"abstract":"In this paper, we present a study on activity functions for an MLNN (multi-layered neural network) and propose a suitable activity function for data enlargement processing. We have carefully studied the training performance of Sigmoid, ReLu, Leaky-ReLu and L & exp. activity functions for few inputs to multiple output training patterns. Our MLNNs model has L hidden layers with two or three inputs to four or six outputs data variations by BP (backpropagation) NN (neural network) training. We focused on the multi teacher training signals to investigate and evaluate the training performance in MLNNs to select the best and good activity function for data enlargement and hence could be applicable for image and signal processing (synaptic divergence) along with the proposed methods with convolution networks. We specifically used four activity functions from which we found out that L & exp. activity function can suite DENN (data enlargement neural network) training since it could give the highest percentage training abilities compared to the other activity functions of Sigmoid, ReLu and Leaky-ReLu during simulation and training of data in the network. And finally, we recommend L & exp. function to be good for MLNNs and may be applicable for signal processing of data and information enlargement because of its performance training characteristics with multiple teacher training patterns using original generated data and hence can be tried with CNN (convolution neural networks) of image processing.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123511235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Challenges in Power Production Investment in Vietnam","authors":"N.H. Nguyen, B. V. Doan, Q. L. Luu, Thanh Cao Nguyen","doi":"10.17265/2328-2223/2019.01.003","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.01.003","url":null,"abstract":"This paper presents the results of the survey to initially assess the current situation of power supply chain development in Vietnam. The research team used questionnaires to identify challenges and barriers in power production investment. Surveyors came from power generation units, power transmission and distribution units, service providers for power plants, consulting agency and research institutes. The results indicated that there is a difference among enterprises’ barriers and difficulties in the management, finance and investment environment. This difference is related to the business profiles of the enterprise, its segment of the electricity generation market, capacity and experience in the market.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126216771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research and Design of Inverter Applied in Solar PV Systems Connected to Distribution Grid","authors":"N. D. Minh, Trinh Trong Chuong, Bui Van Huy, Quach Duc Cuong, B. D. Thanh","doi":"10.17265/2328-2223/2019.01.006","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.01.006","url":null,"abstract":"This paper presents the results of research on the application of inverter in the grid connected solar photovoltaics (PV) system. The main content of the article is to control the three-phase grid connected inverter to meet the requirement of controlling the reactive power to zero at a node of the distribution network while maximizing the active power transmitted to the grid. The control circuits are synthesized on the dq coordinate system and verified on the simulation model by Matlab/Simulink. Both simulation and experimental prototype on 5 kW inverter, being connected to low voltage grid, have been built to show the good results and the practical readiness for implementation.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132439970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Research of Bypass Device to Improve DC Grid Performance","authors":"Jongman Kim, Seok-yong Hong, Beob-seong Song","doi":"10.17265/2328-2223/2019.01.002","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.01.002","url":null,"abstract":"Among the factors determining the performance of the new renewable energy system, the processing part of the untreated DC power is a very important element. In fact, the area where the loss of the new renewable energy system is greatest is also the DC transmission and distribution technology. It is critical to prevent this loss and to improve the performance of the system, and analyze the performance of the resulting through the application of the resulting algorithms. In this thesis, we are discussing ways to calibrate the error in the PV distribution system within the solar power generation system using the Bypass Line Configuration Algorithm. I would like to note that if the operation of the Bypass Line device generates electrical abnormalities in the system’s circuits, it can recover the performance of the system, thereby improving performance.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131203940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Second Order Transition in a Neuron Grid","authors":"R. Thieberger, A. Rabinovitch, A. Vainer, I. Aviram, Y. Biton, D. Braunstein","doi":"10.17265/2328-2223/2019.01.005","DOIUrl":"https://doi.org/10.17265/2328-2223/2019.01.005","url":null,"abstract":": We perform a simple calculation of a classical cellular automata model based on two types of cells (neurons), excitatory and inhibitory ones, randomly distributed in a 2D space. The only varying parameter is the percentage of inhibitory neurons. Even under such simple conditions, we obtain a transition between two states (which we conjecture to be normal and epileptic). The difference between these states are manifested both in the neuronal activity amplitude and in their frequency. The amplitude changes are shown to be similar to those obtained in a tonic-clonic seizure.","PeriodicalId":382952,"journal":{"name":"J. of Electrical Engineering","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133978915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}