2008 12th International Middle-East Power System Conference最新文献_第9页

The application of segmentation and grid shock absorber concept for reliable power grids 分段和电网减震器概念在可靠电网中的应用

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562303

H. Clark, M. El-Gasseir, Hendrik Epp, A. Edris

引用次数: 17

Special features of energy forecast methodology in fast growing countries 快速发展国家能源预测方法的特点

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562406

H. Mahmoud, S. M. Elkhodary, Soliman El-Debeiky, M. Khafagy, A. A. Twijri

{"title":"Special features of energy forecast methodology in fast growing countries","authors":"H. Mahmoud, S. M. Elkhodary, Soliman El-Debeiky, M. Khafagy, A. A. Twijri","doi":"10.1109/MEPCON.2008.4562406","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562406","url":null,"abstract":"An accurate load-forecast is essential for developing a power supply strategy, and system development plan, especially for developing countries where the demand is increased with high growth rate. Forecasting demand and energy for power systems in fast developing countries is however a difficult task; the difficulty arises from the limited historical data, and/or its uncertainty as well as the high growth rate of electric demand. This paper, thus presents a unified forecasting methodology with special features based on the decomposition of loads into several sectorial components for a fast-growing power system. The model has been applied to a typical fast growing system, the Saudi power system, as compared with the conventional method of forecasting the total energy. Further, this paper applies energy forecast models using artificial neural networks (ANN) with multilayer perceptron (MLP) and back propagation (BP) learning algorithm on such a fast growing system. ANN is implemented to support the choice of the most suitable load-forecasting model for long term power system planning. This technique demonstrates the accuracy of the proposed method among the three forecast models and shows that the suggested forecast model based on the ANN technique is simplest with high accuracy. To carry out this task with the various methods, it was necessary to perform data mining for the available historical data. Hence, it could be possible to forecast the peak load forecast assuming the historical data for the load factor.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"27 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":"130345181","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

Speed and stator resistance identification schemes for a low speed sensorless induction motor drive 低速无传感器感应电机驱动的速度和定子电阻识别方案

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562407

M. Zaky, M. Khater, H. Yasin, S. Shokralla

引用次数: 7

Unity Power Factor control of permanent magnet motor drive system 永磁电机驱动系统的统一功率因数控制

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562309

M. Moussa, Ahmed A. Helal, Y. Gaber, H. A. Youssef

{"title":"Unity Power Factor control of permanent magnet motor drive system","authors":"M. Moussa, Ahmed A. Helal, Y. Gaber, H. A. Youssef","doi":"10.1109/MEPCON.2008.4562309","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562309","url":null,"abstract":"The permanent magnet synchronous motors (PMSMs) have gained an increasing interest recently. The wide variety of applications of PMSM drives makes it necessary to achieve fast and reliable drive control system design. Vector control of PMSM can achieve fast dynamic response with less complexity and parameter-independent controller, prevent demagnetization of the motor and allow maximum efficiency operation. In this paper, a novel unity power factor (UPF) control drive for PMSMs is presented. The drive is performed with constraint on the (PF) such that its steady-state value is unity. This feature provides an extension of the constant torque region, resulting in higher output power of the PMSM drive, which is desirable in many applications requiring extended speed range at rated motor torque. However, this drive is not optimal in terms of efficiency which will be less than that obtained from conventional decoupled vector control drive for the same torque. Therefore, it is concluded that before reaching the rated speed, the conventional decoupled vector control is preferable, whereas, the UPF control is optimal to have a wider range of speed operation (above the base speed of the conventional vector control) and hence, extension of the constant torque region. Above this extended base speed, the PMSM drive can be operated in constant power mode using the conventional field-weakening technique having constant supply voltage and current. The drive system is built using MATLAB-SIMULINK software. The validity is evaluated in both steady-state condition and transient response using computer simulation.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"30 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":"126854464","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: 23

Artificial neural network PI controlled superconducting magnetic energy storage, SMES for augmentation of power systems stability 人工神经网络PI控制超导磁能存储，SMES用于增强电力系统稳定性

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562332

A. Hemeida

引用次数: 8

Digital technique for power transformer fault detection based on positive sequence admittance approach 基于正序导纳方法的电力变压器故障检测数字技术

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562348

M. Eissa, E. Shehab_Eldin, M. E. Masoud, A. S. Abd-Elatif

引用次数: 8

High impedance fault detection in mutually coupled double-ended transmission lines using high frequency disturbances 基于高频干扰的互耦双端传输线高阻抗故障检测

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562362

E. Aboul-Zahab, E. Eldin, D. Ibrahim, S. Saleh

{"title":"High impedance fault detection in mutually coupled double-ended transmission lines using high frequency disturbances","authors":"E. Aboul-Zahab, E. Eldin, D. Ibrahim, S. Saleh","doi":"10.1109/MEPCON.2008.4562362","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562362","url":null,"abstract":"Coupling Capacitor Voltage Transformer (CCVT) secondary voltages, normally applied to conventional schemes, do not comprise appropriate information for schemes that operate on high frequency fault generated transients. However it is possible to capture the required travelling wave information contained in fault transients using a high frequency tap from a CCVT. This paper presents an ATP/EMTP fault simulations studies based algorithm for half cycle high impedance fault detection. The proposed scheme implemented on two different models of HIF in extra high voltage mutually coupled double- ended transmission lines. The scheme recognizes the distortion of the voltage waveforms caused by the arcs usually associated with HIFs. The high pass filter tap yields three phase voltage in the high frequency range which are fed to Clarke's transformation to decouple the traveling waves of the mutually coupled lines and produces ground mode and aerial modes voltage components to the classifier for pattern recognition. The classifier is based on an algorithm that uses recursive method to sum the absolute values of the high frequency signal generated over one cycle and shifting one sample. Characteristics of the proposed fault detection scheme are analyzed by extensive simulation studies that clearly reveal that the proposed method can accurately detect HIFs in the EHV transmission lines within only half a cycle from the instant of fault occurrence. The reliability of the proposed scheme does not affected by different fault conditions such as fault distance and fault inception angle.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"17 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":"125575143","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: 13

Economic study on the effectiveness of photovoltaic street lighting in Universiti Teknologi Malaysia 马来西亚科技大学光伏路灯照明效果的经济学研究

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562354

H. A. Rahman, M.Y. Hassan, M. Majid, K. M. Nor, N. A. Atan

引用次数: 5

A Gabor Transform-based universal fault detector for transmission lines 基于Gabor变换的输电线路通用故障检测器

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562356

T. Kawady, A.E. Ibrahim, A. Taalab

{"title":"A Gabor Transform-based universal fault detector for transmission lines","authors":"T. Kawady, A.E. Ibrahim, A. Taalab","doi":"10.1109/MEPCON.2008.4562356","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562356","url":null,"abstract":"In this paper, a new fault detection scheme is proposed for transmission systems using Gabor transform (GT) for signal processing purposes instead of the conventional Fourier analysis methods. The detector uniquely detects both low impedance faults and high impedance ones with the same efficacy providing universal and precise fault detection for transmission systems. It utilizes GT as a feature extractor and artificial neural networks for pattern recognition and classification processes. The use of GT is motivated by the fact that the Gabor elementary functions have distinctively an optimal localization property in the joint time and frequency domains, which leads to optimal extraction of features from signals that is hard to be detected using conventional detectors. The generalization capability of the system allows detecting fault signals with very low fault currents and associated with, sharp and abrupt changes, dc decaying, non integer harmonics and non stationary quantities. The alternative transient program (ATP) is employed for the investigation phase. All simulation tests corroborate the superiority of the proposed detector for transmission system protection.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"31 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":"121630409","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: 5

A proposed methodology to analyze systems with distributed harmonic sources 提出了一种分析分布式谐波源系统的方法

2008 12th International Middle-East Power System Conference Pub Date : 2008-03-12 DOI: 10.1109/MEPCON.2008.4562319

M. El-Saadawi, M. Tantawy, A. Hatata

引用次数: 1