Pub Date : 2008-03-12DOI: 10.1109/MEPCON.2008.4562380
M. A. Abido
A novel approach to multiobjective particle swarm optimization (MOPSO) technique for solving optimal power flow (OPF) problem is proposed in this paper. The new MOPSO technique evolves a multiobjective version of PSO by proposing redefinition of global best and local best individuals in multiobjective optimization domain. A clustering algorithm to manage the size of the Pareto-optimal set is imposed. The proposed MOPSO technique has been implemented to solve the OPF problem with competing and non-commensurable cost and voltage stability enhancement objectives. The optimization runs of the proposed approach have been carried out on a standard test system. The results demonstrate the capabilities of the proposed MOPSO technique to generate a set of well-distributed Pareto-optimal solutions in one single run.
{"title":"Multiobjective particle swarm optimization for optimal power flow problem","authors":"M. A. Abido","doi":"10.1109/MEPCON.2008.4562380","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562380","url":null,"abstract":"A novel approach to multiobjective particle swarm optimization (MOPSO) technique for solving optimal power flow (OPF) problem is proposed in this paper. The new MOPSO technique evolves a multiobjective version of PSO by proposing redefinition of global best and local best individuals in multiobjective optimization domain. A clustering algorithm to manage the size of the Pareto-optimal set is imposed. The proposed MOPSO technique has been implemented to solve the OPF problem with competing and non-commensurable cost and voltage stability enhancement objectives. The optimization runs of the proposed approach have been carried out on a standard test system. The results demonstrate the capabilities of the proposed MOPSO technique to generate a set of well-distributed Pareto-optimal solutions in one single run.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"64 Suppl 2 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":"130311709","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.2008.4562409
A. Shaltout, M. Mostafa
This paper presents the dynamic modeling of wind energy induction generator WEIG. Detailed models have been developed to simulate the dynamic behaviour of the system elements namely; the turbine, generator and drive train. The system transient during the starting period has been investigated, where it has been found that the shaft connecting the wind turbine and generator may be subjected to hazardous torsional torques. Various techniques have been considered to find an appropriate procedure to alleviate these hazardous torsional torques.
{"title":"Starting process of wind generators WEIG","authors":"A. Shaltout, M. Mostafa","doi":"10.1109/MEPCON.2008.4562409","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562409","url":null,"abstract":"This paper presents the dynamic modeling of wind energy induction generator WEIG. Detailed models have been developed to simulate the dynamic behaviour of the system elements namely; the turbine, generator and drive train. The system transient during the starting period has been investigated, where it has been found that the shaft connecting the wind turbine and generator may be subjected to hazardous torsional torques. Various techniques have been considered to find an appropriate procedure to alleviate these hazardous torsional torques.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"59 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":"124680086","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.2008.4562327
K. El-Metwally
This paper presents an adaptive fuzzy logic control approach for designing a decentralized controller for load frequency control of interconnected power areas. The proposed adaptive fuzzy logic load frequency controller (AFLFC) has been designed to improve the dynamic performance of the frequency and the tie line power flow under a sudden load change in the power areas. The AFLFC replaces the original conventional integral controller and utilizes the same area criteria error input. The effect of generation rate constraint (GRC) for both areas has been considered in the controller design. Time-domain simulations using MATALB/SIMULINK program has been performed to demonstrate the effectiveness of the proposed AFLFC. The simulation results show that the proposed AFLFC provides good damping and reduces the overshoot of the different area frequency deviations and also reduces the interchanged tie power.
{"title":"An adaptive fuzzy logic controller for a two area load frequency control problem","authors":"K. El-Metwally","doi":"10.1109/MEPCON.2008.4562327","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562327","url":null,"abstract":"This paper presents an adaptive fuzzy logic control approach for designing a decentralized controller for load frequency control of interconnected power areas. The proposed adaptive fuzzy logic load frequency controller (AFLFC) has been designed to improve the dynamic performance of the frequency and the tie line power flow under a sudden load change in the power areas. The AFLFC replaces the original conventional integral controller and utilizes the same area criteria error input. The effect of generation rate constraint (GRC) for both areas has been considered in the controller design. Time-domain simulations using MATALB/SIMULINK program has been performed to demonstrate the effectiveness of the proposed AFLFC. The simulation results show that the proposed AFLFC provides good damping and reduces the overshoot of the different area frequency deviations and also reduces the interchanged tie power.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"25 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120972649","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.2008.4562335
D. Mansour, T. Okusu, K. Nishizawa, H. Kojima, N. Hayakawa, F. Endo, H. Okubo
The high reliability, less maintenance and compact size of Gas Insulated Switchgears (GISs) have made them the primary choice for many utilities. However, sometimes insulation defects inside GIS can be a serious threat to safe operation of GIS and can lead to costly disruption of supply. As insulation failure usually starts with partial discharge (PD) activity, this paper investigates the differences in PD characteristics in SF6 gas among different types of defects. The defect types considered in this study are particles in a gas gap, particles adhered on a spacer surface and spacer/electrode detachment. Different experiments were made for sequential PD measurements using the system of PD-Current Pulse Waveform Analysis (PD-CPWA). The PD phase characteristics, PD pulse number and PD current were analyzed for the different defect types. Also the ratio of voltage increment to phase increment at the next PD pulse appearance (Deltau/Deltaphi pattern) was obtained and compared for each defect type. Experimental results show that correct identification of defects can be achieved based on considered PD characteristics.
{"title":"Comparison of partial discharge characteristics for different defect types in SF6 gas insulation system","authors":"D. Mansour, T. Okusu, K. Nishizawa, H. Kojima, N. Hayakawa, F. Endo, H. Okubo","doi":"10.1109/MEPCON.2008.4562335","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562335","url":null,"abstract":"The high reliability, less maintenance and compact size of Gas Insulated Switchgears (GISs) have made them the primary choice for many utilities. However, sometimes insulation defects inside GIS can be a serious threat to safe operation of GIS and can lead to costly disruption of supply. As insulation failure usually starts with partial discharge (PD) activity, this paper investigates the differences in PD characteristics in SF6 gas among different types of defects. The defect types considered in this study are particles in a gas gap, particles adhered on a spacer surface and spacer/electrode detachment. Different experiments were made for sequential PD measurements using the system of PD-Current Pulse Waveform Analysis (PD-CPWA). The PD phase characteristics, PD pulse number and PD current were analyzed for the different defect types. Also the ratio of voltage increment to phase increment at the next PD pulse appearance (Deltau/Deltaphi pattern) was obtained and compared for each defect type. Experimental results show that correct identification of defects can be achieved based on considered PD characteristics.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"21 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":"116362889","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.2008.4562339
B. M. Hasanien, K. Sayed
This paper presents the design of zero current switching ZCS pulse frequency modulation type DC-DC converter for magnetron power supply. A magnetron serving as the microwave source in a microwave oven is driven by a switch mode power supply (SMPS). SMPSs have the advantages of improved efficiency, reduced size and weight, regulation and the ability to operate directly from the converter DC bus. The demands of the load system and the design of the power supply required to produce constant power at 4 kV. A magnetron power supply requires the ability to limit the load current under short circuit conditions. The current source series resonant converter is a circuit configuration which can achieve this. The main features of the proposed converter are an inherent protection against a short circuit at the output, a high voltage gain and zero current switching over a large range of output power. These characteristics make it a viable choice for the implementation of a high voltage magnetron power supply.
{"title":"Current source ZCS PFM DC-DC converter for magnetron power supply","authors":"B. M. Hasanien, K. Sayed","doi":"10.1109/MEPCON.2008.4562339","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562339","url":null,"abstract":"This paper presents the design of zero current switching ZCS pulse frequency modulation type DC-DC converter for magnetron power supply. A magnetron serving as the microwave source in a microwave oven is driven by a switch mode power supply (SMPS). SMPSs have the advantages of improved efficiency, reduced size and weight, regulation and the ability to operate directly from the converter DC bus. The demands of the load system and the design of the power supply required to produce constant power at 4 kV. A magnetron power supply requires the ability to limit the load current under short circuit conditions. The current source series resonant converter is a circuit configuration which can achieve this. The main features of the proposed converter are an inherent protection against a short circuit at the output, a high voltage gain and zero current switching over a large range of output power. These characteristics make it a viable choice for the implementation of a high voltage magnetron power supply.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"15 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":"116481831","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.2008.4562388
E. Azadani, S. H. Hosseinian, M. Janati, P. Divshali
This paper proposes an approach for optimal placement of STATic synchronous COMpensator (STATCOM) in power systems. The approach is based on the simultaneous application of particle swarm optimization (PSO) and continuation power flow (CPF) in order to improve voltage profile, minimizing power system total losses and maximizing system loadability with respect to the size of STATCOM. Simulation results show the suitability of the PSO technique in finding multiple optimal solutions to the problem with reasonable computational effort. The installation of the STATOCM on these buses can increase the system voltage stability margin. The proposed technique is examined on the IEEE57 bus test system.
{"title":"Optimal placement of multiple STATCOM","authors":"E. Azadani, S. H. Hosseinian, M. Janati, P. Divshali","doi":"10.1109/MEPCON.2008.4562388","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562388","url":null,"abstract":"This paper proposes an approach for optimal placement of STATic synchronous COMpensator (STATCOM) in power systems. The approach is based on the simultaneous application of particle swarm optimization (PSO) and continuation power flow (CPF) in order to improve voltage profile, minimizing power system total losses and maximizing system loadability with respect to the size of STATCOM. Simulation results show the suitability of the PSO technique in finding multiple optimal solutions to the problem with reasonable computational effort. The installation of the STATOCM on these buses can increase the system voltage stability margin. The proposed technique is examined on the IEEE57 bus test system.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"32 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":"126749945","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.2008.4562374
K. Youssef
Electricity produces Electric and magnetic fields which were declared to be dangerous to the human body. There have been a great concern and studies by many authorities and agencies to investigate Electromagnetic fields (EMFs) health effects and establishing restrictive exposure limits. This concern has arisen as a result of the controversial and contradictory findings in the scientific research, especially from the epidemiological studies. This paper is concerned with the Measurement of power frequency magnetic fields originated from low voltage equipments around us. These fields are used to characterize the sources and levels of exposure to humans. The capabilities of the adopted instruments to measure such fields have been advanced in the recent years. In addition to its simplicity, easy-to-use. There are now portable personal exposure meters capable of recording and describing the statistical, threshold, frequency and waveform characteristics of magnetic field exposure. The measurements of magnetic fields were done to determine the magnitude of magnetic field, calculate the different measured magnetic field indices and to compare the measured and evaluated values to determine limits suggested by other authorities and agencies. The measurements indicate a relatively low values compared by the declared regulations.
{"title":"Measurements and evaluation of adverse health effects of electromagnetic fields from low voltage equipments","authors":"K. Youssef","doi":"10.1109/MEPCON.2008.4562374","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562374","url":null,"abstract":"Electricity produces Electric and magnetic fields which were declared to be dangerous to the human body. There have been a great concern and studies by many authorities and agencies to investigate Electromagnetic fields (EMFs) health effects and establishing restrictive exposure limits. This concern has arisen as a result of the controversial and contradictory findings in the scientific research, especially from the epidemiological studies. This paper is concerned with the Measurement of power frequency magnetic fields originated from low voltage equipments around us. These fields are used to characterize the sources and levels of exposure to humans. The capabilities of the adopted instruments to measure such fields have been advanced in the recent years. In addition to its simplicity, easy-to-use. There are now portable personal exposure meters capable of recording and describing the statistical, threshold, frequency and waveform characteristics of magnetic field exposure. The measurements of magnetic fields were done to determine the magnitude of magnetic field, calculate the different measured magnetic field indices and to compare the measured and evaluated values to determine limits suggested by other authorities and agencies. The measurements indicate a relatively low values compared by the declared regulations.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"76 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":"127391794","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.2008.4562359
A. Elmitwally, A. Abdelmageid, I. Tawfeik
In this paper, Fuzzy-based voltage control in a realistic distribution system that is a part of the North Delta Electricity Distribution Company network in Egypt is concerned. This system includes tap-changed main transformer, synchronous condenser and feeders switched capacitors whose operation is to be coordinated. The imprecise linguistic expressions associated to practical operation are treated via fuzzy sets. First, the objective function and constraints are formulated in terms of fuzzy sets. Then, a direct search optimization technique is adopted to solve the problem to determine the optimal dispatching schedule of the main transformer tap position, feeders capacitors on/off status and synchronous condenser reactive power on hour-by-hour basis throughout the day. Extensive results are discussed while comparing the proposed voltage control strategy versus two others.
{"title":"Fuzzy sets- based voltage control strategy for radial distribution systems","authors":"A. Elmitwally, A. Abdelmageid, I. Tawfeik","doi":"10.1109/MEPCON.2008.4562359","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562359","url":null,"abstract":"In this paper, Fuzzy-based voltage control in a realistic distribution system that is a part of the North Delta Electricity Distribution Company network in Egypt is concerned. This system includes tap-changed main transformer, synchronous condenser and feeders switched capacitors whose operation is to be coordinated. The imprecise linguistic expressions associated to practical operation are treated via fuzzy sets. First, the objective function and constraints are formulated in terms of fuzzy sets. Then, a direct search optimization technique is adopted to solve the problem to determine the optimal dispatching schedule of the main transformer tap position, feeders capacitors on/off status and synchronous condenser reactive power on hour-by-hour basis throughout the day. Extensive results are discussed while comparing the proposed voltage control strategy versus two others.","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":"133606222","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.2008.4562386
M. El Metwally, A.A. El Emary, F.M. El Bendary, M. I. Mosaad
This paper presents evolutionary technique to seek the optimal location of FACTS devices in a power system. FACTS controllers in the form of SVC type are introduced. This evolutionary technique is genetic algorithms (GAs). Provided optimal locations, FACTS devices can be used to achieve the optimal power flow (OPF) without any constraint violation and thus to increase the utilization of the lowest cost generation in power system. FACTS location should be reasonably chosen according to their contribution to the general objective of power system economic generation and dispatch. The objective cost function, which consists of the investment costs for this type of FACTS devices and the generation costs, is minimized. Numerical examples will be indicated to obtain the optimal allocation of SVC.
{"title":"Optimal allocation of FACTS devices in power system using genetic algorithms","authors":"M. El Metwally, A.A. El Emary, F.M. El Bendary, M. I. Mosaad","doi":"10.1109/MEPCON.2008.4562386","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562386","url":null,"abstract":"This paper presents evolutionary technique to seek the optimal location of FACTS devices in a power system. FACTS controllers in the form of SVC type are introduced. This evolutionary technique is genetic algorithms (GAs). Provided optimal locations, FACTS devices can be used to achieve the optimal power flow (OPF) without any constraint violation and thus to increase the utilization of the lowest cost generation in power system. FACTS location should be reasonably chosen according to their contribution to the general objective of power system economic generation and dispatch. The objective cost function, which consists of the investment costs for this type of FACTS devices and the generation costs, is minimized. Numerical examples will be indicated to obtain the optimal allocation of SVC.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"19 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":"131490750","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.2008.4562336
M. Abd-El-Aziz, M. Nashed, A. Adly, E. Abou-El-Zahab
All power system substations use three phase parallel busbars in the power distribution between loads. These busbars are subjected to electromagnetic forces which may cause their permanent deformation, break of insulating supports and an excess vibrational stresses applied on the busbars. From the factors affect these forces is whether the busbars currents have harmonic content or not. This paper presents an analytical approach from which overall forces and local force densities can be calculation. Busbars currents contain harmonics are used in this approach implementation. These currents are taken from a simulated model of 3-pulse rectifier, which is compared with an experimental model to give well qualitative current values.
{"title":"Computation of busbars local electromagnetic force densities connected to 3-pulse rectifier load over a complete cycle","authors":"M. Abd-El-Aziz, M. Nashed, A. Adly, E. Abou-El-Zahab","doi":"10.1109/MEPCON.2008.4562336","DOIUrl":"https://doi.org/10.1109/MEPCON.2008.4562336","url":null,"abstract":"All power system substations use three phase parallel busbars in the power distribution between loads. These busbars are subjected to electromagnetic forces which may cause their permanent deformation, break of insulating supports and an excess vibrational stresses applied on the busbars. From the factors affect these forces is whether the busbars currents have harmonic content or not. This paper presents an analytical approach from which overall forces and local force densities can be calculation. Busbars currents contain harmonics are used in this approach implementation. These currents are taken from a simulated model of 3-pulse rectifier, which is compared with an experimental model to give well qualitative current values.","PeriodicalId":236620,"journal":{"name":"2008 12th International Middle-East Power System Conference","volume":"97 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":"134081457","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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