Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562387
H. Baghaee, M. Jannati, B. Vahidi, S. Hosseinian, S. Jazebi
As power transfer increases, operation of power system become gradually more complex. Short circuit level increases and so power system will become less secure. Moreover, the problem of power system security has become a mater of grave concern in the deregulated power industry. FACTS devices can control power flow because of their flexibility and fast control characteristics. Placement of these devices in suitable location can lead to control in line flow and maintain bus voltages in desired level and so improve power system security. This paper presents a novel algorithm for allocation of FACTS devices based on genetic algorithm (GA). Cost function of FACTS devices and power system losses are considered in this algorithm. Proposed algorithm is tested on IEEE 30 bus power system for optimal allocation of multi-type FACTS devices and results are presented.
{"title":"Optimal multi-type FACTS allocation using genetic algorithm to improve power system security","authors":"H. Baghaee, M. Jannati, B. Vahidi, S. Hosseinian, S. Jazebi","doi":"10.1109/MEPCON.2008.4562387","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562387","url":null,"abstract":"As power transfer increases, operation of power system become gradually more complex. Short circuit level increases and so power system will become less secure. Moreover, the problem of power system security has become a mater of grave concern in the deregulated power industry. FACTS devices can control power flow because of their flexibility and fast control characteristics. Placement of these devices in suitable location can lead to control in line flow and maintain bus voltages in desired level and so improve power system security. This paper presents a novel algorithm for allocation of FACTS devices based on genetic algorithm (GA). Cost function of FACTS devices and power system losses are considered in this algorithm. Proposed algorithm is tested on IEEE 30 bus power system for optimal allocation of multi-type FACTS devices and results are presented.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"1 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":"125808837","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562328
K. Yoshida, M. El-Nemr
The experimental single sided linear motor maglev vehicle ME02 available in our laboratory is levitated and propelled by permanent magnet linear synchronous motor (PM LSM). To eliminate the undesired pitching motion resulting from the unbalanced torques developed around the vehicle center of gravity, two air-cored electromagnets (AEM) are located in the vehicle's most front and rear. The proposed electromagnets are feed with controlled current such that the developed torque works against the pitching torque. In the current paper, analytical voltage model for the AEM is introduced. The model is based on derivation of the analytical solution of the multilayer boundary field problem of PM LSM. A voltage chopper is utilized in its current regulated mode to track the demand current required to damp the pitching motion. To validate the effectiveness of the proposed system, simulated study for pitching motion control is carried out with the mass and location of center of gravity are taken as disturbances. The results show the robustness of the introduced control scheme.
{"title":"Analysis and simulation of current regulated air-cored electromagnet for pitching motion control of the underwater vehicle ME02","authors":"K. Yoshida, M. El-Nemr","doi":"10.1109/MEPCON.2008.4562328","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562328","url":null,"abstract":"The experimental single sided linear motor maglev vehicle ME02 available in our laboratory is levitated and propelled by permanent magnet linear synchronous motor (PM LSM). To eliminate the undesired pitching motion resulting from the unbalanced torques developed around the vehicle center of gravity, two air-cored electromagnets (AEM) are located in the vehicle's most front and rear. The proposed electromagnets are feed with controlled current such that the developed torque works against the pitching torque. In the current paper, analytical voltage model for the AEM is introduced. The model is based on derivation of the analytical solution of the multilayer boundary field problem of PM LSM. A voltage chopper is utilized in its current regulated mode to track the demand current required to damp the pitching motion. To validate the effectiveness of the proposed system, simulated study for pitching motion control is carried out with the mass and location of center of gravity are taken as disturbances. The results show the robustness of the introduced control scheme.","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":"123493471","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562398
M. el-Zanaty, M. Orabi, M. El-Sadek
Nowadays, the main important issue for power supplies designers is to feed last generation of microprocessors and DSPs, since they require high current slew rates on accompain with low output voltage. This paper introduces the design steps for a buck converter used in that kind of applications. Also, the advantage of applying high switching frequency has been made clear. Experimental results have been obtained to verify simulation and analysis.
{"title":"Review of synchronous buck converter design optimization","authors":"M. el-Zanaty, M. Orabi, M. El-Sadek","doi":"10.1109/MEPCON.2008.4562398","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562398","url":null,"abstract":"Nowadays, the main important issue for power supplies designers is to feed last generation of microprocessors and DSPs, since they require high current slew rates on accompain with low output voltage. This paper introduces the design steps for a buck converter used in that kind of applications. Also, the advantage of applying high switching frequency has been made clear. Experimental results have been obtained to verify simulation and analysis.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"28 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":"125017902","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562361
H. Al-Nasseri, M. Redfern
Protecting Micro-grids containing micro-sources equipped with power electronics interfaces is a major challenge for engineers developing techniques to exploit renewable energy sources for electricity generation. Conventional techniques based on overcurrent protection have major limitations and new techniques have to be explored. The method described in this paper provides reliable and fast detection for different types of faults within the micro-grid. This proposed protection scheme consists of two main stages. The first stage is mainly used to identify the type of the fault and the second stage which utilise the THD to discriminate between the faulted zones and as a result the relay will trip and isolate the faulted section leaving the rest of the network un-affected. Analysis and simulation results are presented for different types of faults within the micro-grid.
{"title":"Harmonics content based protection scheme for Micro-grids dominated by solid state converters","authors":"H. Al-Nasseri, M. Redfern","doi":"10.1109/MEPCON.2008.4562361","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562361","url":null,"abstract":"Protecting Micro-grids containing micro-sources equipped with power electronics interfaces is a major challenge for engineers developing techniques to exploit renewable energy sources for electricity generation. Conventional techniques based on overcurrent protection have major limitations and new techniques have to be explored. The method described in this paper provides reliable and fast detection for different types of faults within the micro-grid. This proposed protection scheme consists of two main stages. The first stage is mainly used to identify the type of the fault and the second stage which utilise the THD to discriminate between the faulted zones and as a result the relay will trip and isolate the faulted section leaving the rest of the network un-affected. Analysis and simulation results are presented for different types of faults within the micro-grid.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"24 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":"128829053","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562401
T. Wolbank, M. Metwally
Controlled induction motor drives without mechanical sensor at the motor shaft at low speed down to zero fundamental frequency can so far only be achieved by evaluating inherent saliencies of the induction machine. Similar to other sensorless methods based on signal injection, the resulting control signals of the indirect flux detection method by on-line reactance measurement is influenced, for example, by the saturation based saliency, the slotting saliency, and the anisotropy saliency as well as by load and flux level. Since these influences are extremely dependant on the machine design, they can hardly be calculated in advance and removed by filtering or digital signal processing. However the possibility of utilizing a neural network for learning the individual dependencies and removing the unwanted influences can provide a very satisfactory result. Since the easy implementation of a neural network does only use a small amount of calculation power, the algorithm can be implemented even in low-cost signal processors. Measurements on mechanical sensorless controlled induction machines present adequate results up to about rated load.
{"title":"Saliency tracking-based sensorless control of induction machines using artificial neural networks","authors":"T. Wolbank, M. Metwally","doi":"10.1109/MEPCON.2008.4562401","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562401","url":null,"abstract":"Controlled induction motor drives without mechanical sensor at the motor shaft at low speed down to zero fundamental frequency can so far only be achieved by evaluating inherent saliencies of the induction machine. Similar to other sensorless methods based on signal injection, the resulting control signals of the indirect flux detection method by on-line reactance measurement is influenced, for example, by the saturation based saliency, the slotting saliency, and the anisotropy saliency as well as by load and flux level. Since these influences are extremely dependant on the machine design, they can hardly be calculated in advance and removed by filtering or digital signal processing. However the possibility of utilizing a neural network for learning the individual dependencies and removing the unwanted influences can provide a very satisfactory result. Since the easy implementation of a neural network does only use a small amount of calculation power, the algorithm can be implemented even in low-cost signal processors. Measurements on mechanical sensorless controlled induction machines present adequate results up to about rated load.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"42 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":"126413049","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562370
A. Hossam-eldin, W. Mokhtar
Transmission lines are the major source of electromagnetic field interference (EMFI) with metallic structures such as pipelines, railways and under ground cables laying in the same corridor. It is a serious problem because the (EMFI) produces induced voltages on the metallic structures .These voltages can result in hazard volt to operating personnel especially who operate on pipelines .It can affect the pipeline associated equipment (cathodic protection , damage the coating , affect the pipe itself and furthermore will produce corrosion). This paper discusses the study for inductive interference between pipeline and neighboring electrical transmission line .It is especially used to simplify and to automate the modeling for right-of-way configuration involving transmission line and pipeline .It can calculate the voltage on pipeline and the longitudinal current. A practical case study of inductive interference between a pipeline and electrical power line under steady state condition is illustrated.
{"title":"Interference between HV transmission line and nearby pipelines","authors":"A. Hossam-eldin, W. Mokhtar","doi":"10.1109/MEPCON.2008.4562370","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562370","url":null,"abstract":"Transmission lines are the major source of electromagnetic field interference (EMFI) with metallic structures such as pipelines, railways and under ground cables laying in the same corridor. It is a serious problem because the (EMFI) produces induced voltages on the metallic structures .These voltages can result in hazard volt to operating personnel especially who operate on pipelines .It can affect the pipeline associated equipment (cathodic protection , damage the coating , affect the pipe itself and furthermore will produce corrosion). This paper discusses the study for inductive interference between pipeline and neighboring electrical transmission line .It is especially used to simplify and to automate the modeling for right-of-way configuration involving transmission line and pipeline .It can calculate the voltage on pipeline and the longitudinal current. A practical case study of inductive interference between a pipeline and electrical power line under steady state condition is illustrated.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"93 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120879055","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562333
M. Kezunovic, A. Edris
Increased demands on power systems reliability lead to more stringent requirements for power system monitoring, maintenance and control. Introduction of Intelligent Electronic Devices (IEDs) in substations allows more elaborate recording of field data that in turn may be used to enhance the analysis for monitoring, maintenance and control purposes. While the additional data recorded by IEDs provides more information than the classical solutions, the overwhelming amount of data makes manual analysis quite impractical. Automating the analysis becomes a crucial approach for improving reliability. The paper also illustrates how the overall solution may be implemented using various software and communication means. Commercial version of the solution is partially implemented at one of the EPRI member utilities and a fully expanded version is being planned at another.
{"title":"Automated analysis systems for monitoring, maintenance and control of power systems","authors":"M. Kezunovic, A. Edris","doi":"10.1109/MEPCON.2008.4562333","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562333","url":null,"abstract":"Increased demands on power systems reliability lead to more stringent requirements for power system monitoring, maintenance and control. Introduction of Intelligent Electronic Devices (IEDs) in substations allows more elaborate recording of field data that in turn may be used to enhance the analysis for monitoring, maintenance and control purposes. While the additional data recorded by IEDs provides more information than the classical solutions, the overwhelming amount of data makes manual analysis quite impractical. Automating the analysis becomes a crucial approach for improving reliability. The paper also illustrates how the overall solution may be implemented using various software and communication means. Commercial version of the solution is partially implemented at one of the EPRI member utilities and a fully expanded version is being planned at another.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"28 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":"128146077","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562304
M. Awad, N. Heggi, F. Tahoun
Reliability of a transmission structure depends not only upon its design, but also on the development of structural arrangement, detailing of connections, uniformity of quality of structural sections, accurate fabrication, and finally material type and quality. Recently fiber reinforced polymer composites (FRP), or advanced organic materials are very attractive for use in transmission line towers. FRP composites have many benefits to their selection and use. The selection of the materials depends on the performance and intended use of the product. The composites designer can tailor the performance of the end product with proper selection of materials. This paper aims to investigate the future of towers made of organic material. Comparative study with the conventional type commonly used in Egypt will be carried out. Also the economic studies were performed to estimate the level of profitability for both technical options of steel and FRP distribution networks.
{"title":"The future of towers made of organic compound materials","authors":"M. Awad, N. Heggi, F. Tahoun","doi":"10.1109/MEPCON.2008.4562304","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562304","url":null,"abstract":"Reliability of a transmission structure depends not only upon its design, but also on the development of structural arrangement, detailing of connections, uniformity of quality of structural sections, accurate fabrication, and finally material type and quality. Recently fiber reinforced polymer composites (FRP), or advanced organic materials are very attractive for use in transmission line towers. FRP composites have many benefits to their selection and use. The selection of the materials depends on the performance and intended use of the product. The composites designer can tailor the performance of the end product with proper selection of materials. This paper aims to investigate the future of towers made of organic material. Comparative study with the conventional type commonly used in Egypt will be carried out. Also the economic studies were performed to estimate the level of profitability for both technical options of steel and FRP distribution networks.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"23 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":"133081169","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562322
A. Eldin, M. El-Sayed, H. Youssef
A genetic based technique is presented for solving the unit commitment optimization problem. The proposed technique consists mainly of two stages. In the first stage, economic dispatch for each interval (hour) of study is executed. Several solutions (individuals) are generated around the previous economic dispatch solution. These individuals are introduced as a part of the initial population of the genetic algorithm which is applied as a second stage to optimally identify the solution of the unit commitment optimization problem. The proposed technique is applied to the 10 unit, and the 26 unit test systems.
{"title":"A two-stage genetic based technique for the unit commitment optimization problem","authors":"A. Eldin, M. El-Sayed, H. Youssef","doi":"10.1109/MEPCON.2008.4562322","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562322","url":null,"abstract":"A genetic based technique is presented for solving the unit commitment optimization problem. The proposed technique consists mainly of two stages. In the first stage, economic dispatch for each interval (hour) of study is executed. Several solutions (individuals) are generated around the previous economic dispatch solution. These individuals are introduced as a part of the initial population of the genetic algorithm which is applied as a second stage to optimally identify the solution of the unit commitment optimization problem. The proposed technique is applied to the 10 unit, and the 26 unit test systems.","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":"123471484","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}
Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562320
M. Hamada, M. Wahab, A. El-Sayed, H. Ramadan
A new strategy for capacitor allocation in radial distribution systems is presented in this paper. This strategy adds a new constraint to the well-known constraint (allowed voltage violation). The new constraint is the sectional ohmic loss in each branch of the feeder. Sizes and locations of the capacitors are selected in order to achieve the maximum reduction in the total losses in the system. Sometimes this reduction is not achieved in all the branches but the loss in any individual branch of the system is not allowed to increase than it was before the capacitor placement. The proposed strategy is applied to two different distribution systems with 9 and 34-buses respectively. The results of the proposed strategy are compared with previous works. The comparison showed the validity and the superiority of this strategy.
{"title":"A proposed strategy for capacitor allocation in radial distribution feeders","authors":"M. Hamada, M. Wahab, A. El-Sayed, H. Ramadan","doi":"10.1109/MEPCON.2008.4562320","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562320","url":null,"abstract":"A new strategy for capacitor allocation in radial distribution systems is presented in this paper. This strategy adds a new constraint to the well-known constraint (allowed voltage violation). The new constraint is the sectional ohmic loss in each branch of the feeder. Sizes and locations of the capacitors are selected in order to achieve the maximum reduction in the total losses in the system. Sometimes this reduction is not achieved in all the branches but the loss in any individual branch of the system is not allowed to increase than it was before the capacitor placement. The proposed strategy is applied to two different distribution systems with 9 and 34-buses respectively. The results of the proposed strategy are compared with previous works. The comparison showed the validity and the superiority of this strategy.","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":"130187803","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}
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