Pub Date : 2002-12-10DOI: 10.1109/LESCPE.2002.1020678
A. Sallam, A.M. Khafaga
Application of a fuzzy expert system to the power system gives a common goal in the management of power systems specially for managing the system against voltage instability. Attempts are made in this paper to control voltage instability by load shedding using a fuzzy technique as a fuzzy controller. The fuzzy logic and fuzzy set theory are applied to the problem formulated in the study system. The results of applying the proposed technique to the test system verifies its robustness and feasibility to calculate the optimum and minimum ratio of load shedding as a control to depress the voltage instability problem.
{"title":"Fuzzy expert system using load shedding for voltage instability control","authors":"A. Sallam, A.M. Khafaga","doi":"10.1109/LESCPE.2002.1020678","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020678","url":null,"abstract":"Application of a fuzzy expert system to the power system gives a common goal in the management of power systems specially for managing the system against voltage instability. Attempts are made in this paper to control voltage instability by load shedding using a fuzzy technique as a fuzzy controller. The fuzzy logic and fuzzy set theory are applied to the problem formulated in the study system. The results of applying the proposed technique to the test system verifies its robustness and feasibility to calculate the optimum and minimum ratio of load shedding as a control to depress the voltage instability problem.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123021452","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020681
M. Awadallah, M. Morcos
A model-based diagnostic system for stator winding inter-turn faults of PM brushless DC motor drives is presented. A transient model of the drive system is set up and run under different healthy and faulty conditions. The steady-state supply current is selected as the diagnostic signal to compare the healthy operation to the faulty operation under different loads. The supply current signal is transformed to the frequency domain using the discrete Fourier transform (DFT). Appropriate diagnostic indices are extracted from the supply current spectrum to differentiate between healthy and different faulty conditions.
{"title":"Stator-winding fault diagnosis of PM brushless DC motor drives","authors":"M. Awadallah, M. Morcos","doi":"10.1109/LESCPE.2002.1020681","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020681","url":null,"abstract":"A model-based diagnostic system for stator winding inter-turn faults of PM brushless DC motor drives is presented. A transient model of the drive system is set up and run under different healthy and faulty conditions. The steady-state supply current is selected as the diagnostic signal to compare the healthy operation to the faulty operation under different loads. The supply current signal is transformed to the frequency domain using the discrete Fourier transform (DFT). Appropriate diagnostic indices are extracted from the supply current spectrum to differentiate between healthy and different faulty conditions.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127914896","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020666
S. A. Saleh, M. Rahman
This paper presents a model of the power transformer for electromagnetic transient studies, which employs a wavelet filter bank. In this model both the primary and the secondary windings are represented by stages of a wavelet filter bank where the dimensions of such a filter bank depend on the number of turns of primary windings and secondary windings. The basic building block consists of stages of the wavelet filter bank. Transformer total response is composed of the sum of responses of all stages, which depends on the nature of the primary current. Using the wavelet filter model, the losses due to eddy currents, leakage flux, and inrush currents have been studied. The proposed wavelet filter model has been found to be suitable for power transformer inrush currents including high frequency transient effects.
{"title":"Transient model of power transformer using wavelet filter bank","authors":"S. A. Saleh, M. Rahman","doi":"10.1109/LESCPE.2002.1020666","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020666","url":null,"abstract":"This paper presents a model of the power transformer for electromagnetic transient studies, which employs a wavelet filter bank. In this model both the primary and the secondary windings are represented by stages of a wavelet filter bank where the dimensions of such a filter bank depend on the number of turns of primary windings and secondary windings. The basic building block consists of stages of the wavelet filter bank. Transformer total response is composed of the sum of responses of all stages, which depends on the nature of the primary current. Using the wavelet filter model, the losses due to eddy currents, leakage flux, and inrush currents have been studied. The proposed wavelet filter model has been found to be suitable for power transformer inrush currents including high frequency transient effects.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115902802","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020679
A. Sallam, A.M. Khafaga
This paper argues that the artificial neural network (ANN) is an important technique and can be applied to control voltage instability problems in two ways. The first is to control voltage collapse by using load shedding. In this way the minimum and optimal ratio of load shedding can be calculated. The second is to calculate the reactive power required to control sources in the electric power system. The strengths of this powerful technique lie in its ability for modeling and solving many types of problems. The ANN is designed for those two mentioned ways. A multi-layer feed forward ANN trained with error backpropagation learning is proposed. This network is applied to a stressed power system at different load levels. Simulation results on a test system are reported in this paper.
{"title":"Artificial neural network application to alleviate voltage instability problem","authors":"A. Sallam, A.M. Khafaga","doi":"10.1109/LESCPE.2002.1020679","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020679","url":null,"abstract":"This paper argues that the artificial neural network (ANN) is an important technique and can be applied to control voltage instability problems in two ways. The first is to control voltage collapse by using load shedding. In this way the minimum and optimal ratio of load shedding can be calculated. The second is to calculate the reactive power required to control sources in the electric power system. The strengths of this powerful technique lie in its ability for modeling and solving many types of problems. The ANN is designed for those two mentioned ways. A multi-layer feed forward ANN trained with error backpropagation learning is proposed. This network is applied to a stressed power system at different load levels. Simulation results on a test system are reported in this paper.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134006862","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020680
C. Paduraru
The article describes the concept of automatic testing of protective relays in power industry. First, the increased need for automatic test modules is explained. Next, a detailed example is provided using the "load encroachment characteristic". Relay settings and testing approach are explained step by step. Finally, the capability of the software is emphasized and conclusions are drawn.
{"title":"Automated testing of protective relays using advanced visual test software","authors":"C. Paduraru","doi":"10.1109/LESCPE.2002.1020680","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020680","url":null,"abstract":"The article describes the concept of automatic testing of protective relays in power industry. First, the increased need for automatic test modules is explained. Next, a detailed example is provided using the \"load encroachment characteristic\". Relay settings and testing approach are explained step by step. Finally, the capability of the software is emphasized and conclusions are drawn.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126333270","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020662
K. Xiong, W. Rosehart
As open access market principles are applied to power systems, stability margins have been steadily decreasing. This has lead to events such as rolling black-outs in several power systems, for example, California, and has generally resulted in increased electricity prices. A novel approach to reduce the tension in electrical systems is to establish a fast acting load control program for price and system stability. This differs from traditional approaches where additional transmission lines and generators need to be installed. Using this approach, load can be modeled and controlled similar to a generator, proving spinning reserve. The paper reviews existing implementations of fast acting load control. Furthermore, in this paper, two Lagrangian based approaches are used to determine optimal locations for fast acting load control. The approaches are formulated to consider economic cost and stability limits. The effects of applying these approaches are analyzed using a 30-bus system, which is derived from the IEEE 30-bus test system.
{"title":"Fast acting load control","authors":"K. Xiong, W. Rosehart","doi":"10.1109/LESCPE.2002.1020662","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020662","url":null,"abstract":"As open access market principles are applied to power systems, stability margins have been steadily decreasing. This has lead to events such as rolling black-outs in several power systems, for example, California, and has generally resulted in increased electricity prices. A novel approach to reduce the tension in electrical systems is to establish a fast acting load control program for price and system stability. This differs from traditional approaches where additional transmission lines and generators need to be installed. Using this approach, load can be modeled and controlled similar to a generator, proving spinning reserve. The paper reviews existing implementations of fast acting load control. Furthermore, in this paper, two Lagrangian based approaches are used to determine optimal locations for fast acting load control. The approaches are formulated to consider economic cost and stability limits. The effects of applying these approaches are analyzed using a 30-bus system, which is derived from the IEEE 30-bus test system.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121431099","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020661
H. Yamin
This paper describes a coordination process between GENCOs and the ISO for congestion management and reducing the risk of failure to supply loads. The algorithm underlining the coordination technique is the security-constrained price-based unit commitment (SPUC) which is implemented in two states. At first, GENCOs apply priced-based unit commitment (without transmission security constraints), schedule their generating units and submit their energy and capacity bids to the ISO for maximizing their revenues. The ISO obtains transmission information as well from TRANSCOs via OASIS. Using the two sets of generation and transmission data, the ISO executes inter-zonal and intra-zonal congestion management and contingency analysis for minimizing line flow violations and the risk supplying loads. As part of this package, the ISO would have a chance to minimize both transmission flow and reactive (bus voltage) violations. If transmission flow violations persist after the adjustments are made, the solution would provide a signal to GENCOs, based on Benders decomposition, for modifying their initial bids. Accordingly, additional constraints will be introduced in GENCOs for rescheduling generating units and submitting modified bids to the ISO.
{"title":"Security-constrained price-based unit commitment in the deregulated power market","authors":"H. Yamin","doi":"10.1109/LESCPE.2002.1020661","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020661","url":null,"abstract":"This paper describes a coordination process between GENCOs and the ISO for congestion management and reducing the risk of failure to supply loads. The algorithm underlining the coordination technique is the security-constrained price-based unit commitment (SPUC) which is implemented in two states. At first, GENCOs apply priced-based unit commitment (without transmission security constraints), schedule their generating units and submit their energy and capacity bids to the ISO for maximizing their revenues. The ISO obtains transmission information as well from TRANSCOs via OASIS. Using the two sets of generation and transmission data, the ISO executes inter-zonal and intra-zonal congestion management and contingency analysis for minimizing line flow violations and the risk supplying loads. As part of this package, the ISO would have a chance to minimize both transmission flow and reactive (bus voltage) violations. If transmission flow violations persist after the adjustments are made, the solution would provide a signal to GENCOs, based on Benders decomposition, for modifying their initial bids. Accordingly, additional constraints will be introduced in GENCOs for rescheduling generating units and submitting modified bids to the ISO.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128149827","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020664
Liuchen Chang, H. M. Kojabadi
This paper summarizes the development in standards for interconnecting distributed power generators with electric power systems. Based on a review of the interconnection standards existing and under-development in Canada and internationally, the major interconnection requirements for distributed power generators are presented in this paper in three categories: general specifications, safety and protection, and power quality.
{"title":"Review of interconnection standards for distributed power generation","authors":"Liuchen Chang, H. M. Kojabadi","doi":"10.1109/LESCPE.2002.1020664","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020664","url":null,"abstract":"This paper summarizes the development in standards for interconnecting distributed power generators with electric power systems. Based on a review of the interconnection standards existing and under-development in Canada and internationally, the major interconnection requirements for distributed power generators are presented in this paper in three categories: general specifications, safety and protection, and power quality.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114513557","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020683
J. Talaq
A systematic procedure to solving complex and multiple fault problems of power systems is proposed in this paper. Complex faults are combinations of different common unsymmetrical faults that occur at a single bus. Multiple faults are a series of complex faults that occur at several buses at the same time. The proposed method utilize the well known bus impedance matrix method for fault analysis. Examples of both types of faults are given to demonstrate the proposed procedure.
{"title":"Complex and multiple unsymmetrical fault analysis","authors":"J. Talaq","doi":"10.1109/LESCPE.2002.1020683","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020683","url":null,"abstract":"A systematic procedure to solving complex and multiple fault problems of power systems is proposed in this paper. Complex faults are combinations of different common unsymmetrical faults that occur at a single bus. Multiple faults are a series of complex faults that occur at several buses at the same time. The proposed method utilize the well known bus impedance matrix method for fault analysis. Examples of both types of faults are given to demonstrate the proposed procedure.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116337202","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020682
S. Skok, A. Marusic, S. Tesnjak, I. Pavić
This paper deals with problems connected to the distance protection of double-circuit transmission lines. Because of the zero sequence mutual coupling of parallel circuits, the relay "sees" incorrect impedance. In this paper, the authors develop an adaptive model which solves problems of single-line-to-ground faults on a single line. Different operation modes change short circuit currents (I/sub k1/ - phase-to-earth short circuit current and I/sub k3/ - three-phase short circuit current) on both ends. In fact, the parameters of the active network will be changed. The idea was to develop an adaptive model with different independent Kohonen networks. Each network is trained with short-circuit examples according to the switching mode and operation mode. Input parameters are voltage, current, switching mode and operation mode. The developed adaptive model was tested on a double-circuit 400 kV transmission line.
{"title":"Double-circuit line adaptive protection based on Kohonen neural network considering different operation and switching modes","authors":"S. Skok, A. Marusic, S. Tesnjak, I. Pavić","doi":"10.1109/LESCPE.2002.1020682","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020682","url":null,"abstract":"This paper deals with problems connected to the distance protection of double-circuit transmission lines. Because of the zero sequence mutual coupling of parallel circuits, the relay \"sees\" incorrect impedance. In this paper, the authors develop an adaptive model which solves problems of single-line-to-ground faults on a single line. Different operation modes change short circuit currents (I/sub k1/ - phase-to-earth short circuit current and I/sub k3/ - three-phase short circuit current) on both ends. In fact, the parameters of the active network will be changed. The idea was to develop an adaptive model with different independent Kohonen networks. Each network is trained with short-circuit examples according to the switching mode and operation mode. Input parameters are voltage, current, switching mode and operation mode. The developed adaptive model was tested on a double-circuit 400 kV transmission line.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127072742","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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