2008 12th International Middle-East Power System Conference最新文献_第5页

500 kV transmission system in Egypt solving problem of voltage regulation by means of controlled shunt reactor transformer type (CSRT) 埃及500kv输电系统用可控并联电抗器变压器式(CSRT)解决稳压问题

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562295

G. Alexandrov, M. Dardeer

引用次数: 3

A new torque controller for Direct Torque Controlled Induction Machine drives 直接转矩控制感应电机驱动的新型转矩控制器

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562316

H. Okumus

引用次数: 2

A fast and reliable transformer protection system based on the transformer magnetizing characteristics and artificial neural networks 基于变压器磁化特性和人工神经网络的快速可靠变压器保护系统

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562345

A. Nosseir, A. Attia, F. Tahoon, N. Osman

{"title":"A fast and reliable transformer protection system based on the transformer magnetizing characteristics and artificial neural networks","authors":"A. Nosseir, A. Attia, F. Tahoon, N. Osman","doi":"10.1109/MEPCON.2008.4562345","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562345","url":null,"abstract":"Transformers are one of the most important elements of power systems. Most transformers are equipped with protection systems to avoid damage to the transformers [1]. As any outage of the transformer have severed technical and economical consequences for the network, so implementing fast relaying algorithms for transformer protection devices to satisfy high reliability of the whole power systems is very important. In designing high speed protection systems, the fast discrimination of magnetizing inrush current is very important to prevent the false tripping of relays. The conventional method of inrush current detection [2] for transformer protection based on the value of the second harmonic component of the differential current which requires a long time exceeding one cycle. This paper discriminates between the inrush current state and the internal fault condition based on the transformer magnetizing characteristics within one short cycle. Simulation using EMTP-ATP program on a three phase transformer are carried out. Study cases of inrush current at different switching instants and for all types of internal faults for different phases and on different percentages of transformer windings are simulated. The results obtained from EMTP-ATP package for all simulated conditions used as a training data to artificial neural network (ANN). This helps the differential relay to recognize inrush and internal fault and give the trip signal in case of internal fault only.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131599827","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}

引用次数: 7

Implementation and performance analysis of an elevator electric motor drive system 电梯电机驱动系统的实现与性能分析

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562368

M. Osama, Azim High

引用次数: 10

Computation of electric stress and corona onset voltage in air gaps with floating particles 浮粒气隙中电应力和电晕起始电压的计算

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562337

S. M. El-Makkawy

{"title":"Computation of electric stress and corona onset voltage in air gaps with floating particles","authors":"S. M. El-Makkawy","doi":"10.1109/MEPCON.2008.4562337","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562337","url":null,"abstract":"From the standpoint of the gas insulation design, the most important factors in discharge performance is the corona starting voltage and the flashover voltage. The main problem of insulation design will be solved if the corona onset voltage and flashover voltage are calculated for given electrode arrangement. In this study a general computer program using Matlab is developed to predict the discharge inception voltage levels in sphere-to-sphere gap with the presence of floating conducting particles in air insulated DC power apparatus. Therefore, through out the computations of discharge inception voltages, streamer theory is considered. The streamer theory closely associated to the electric field distribution inside the gap, in order to compute the critical single avalanche size which is responsible for initiating the streamer channel at the discharge inception voltage. The floating metals particles treated in this work are rectangular plates, needles with hemispherical ends and spheres. As a theoretical base, a charge simulation program has been carried out to determine the effect of floating particle in electric field distribution along the gap axis between two sphere electrodes. The dependence of field enhancement and its distribution and corona inception voltage within the floating particle on the shape, size and location of floating metal and the electrode spacing are emphasized. The results concluded that the enhancement of electric field depends on the Shape but in all case the electric field is distorted. The results show that the effect of various parameters on the stress distribution within a floating metal particle is important in the design and testing of dielectric insulating materials.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129766407","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}

引用次数: 1

Slip frequency controlled inverter-fed single-phase induction motors 转差变频调速单相感应电动机

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562404

N. Abdel-Rahim, A. Shaltout

引用次数: 2

Design and simulation of DC/DC boost converter DC/DC升压变换器的设计与仿真

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562340

B. M. Hasaneen, A. Elbaset

引用次数: 161

Stability of DC-DC converters: A ripple based index approach DC-DC变换器的稳定性:基于纹波的指数方法

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562408

A. El Aroudi, E. Alarcón, E. Rodriguez, R. Leyva

引用次数: 4

A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper 一种基于h桥交流斩波器的新型电子升压/降压稳压器拓扑

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562400

H. Ashour

{"title":"A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper","authors":"H. Ashour","doi":"10.1109/MEPCON.2008.4562400","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562400","url":null,"abstract":"The rapid development and high controllability advantages of power electronic devices lead to their application in voltage stabilizers and tap-changers as competitive options with commercially available mechanical counterparts. This paper introduces a new electronic voltage stabilizer topology utilizes four AC switches in a form that may be named as \"AC H-bridge\" connection, and based on pulse width modulation (PWM) AC chopper combined with a single low power compensating transformer. Such topology eliminates the need of the main input multi-tapping transformer, hence reducing the overall size, weight and cost. Depending on the selected switches and value of the chopping duty cycle, the proposed configuration is capable of stepping up or down the input voltage, hence keeping the output voltage constant with continuous flow of input current and better harmonics restraining in the output load voltage. Mathematical equations describing the function of the proposed topology have been demonstrated and simulation analysis has been presented. Practical verification to confirm the capability of the setup has been illustrated through several experimental results and analysis.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133944445","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}

引用次数: 9

A hybrid Hopfield neural network-quadratic programming approach for dynamic economic dispatch problem 动态经济调度问题的混合Hopfield神经网络二次规划方法

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562378

A. Abdelaziz, S. Mekhamer, M. Kamh, M. Badr

引用次数: 16