Pub Date : 2001-07-15DOI: 10.1109/PESS.2001.970350
C.B. Gomes, G. Taranto, N. Martins, D. Falcão
This paper deals with the analysis of long-term coordinated voltage control. The simulations were performed through the use of a fast simulation tool. Several simulations are performed on a small tutorial illustrative system for easy understanding of the electrical phenomena and control strategies. Simulations are also carried out on a large-size model of the Brazilian system.
{"title":"Fast simulations of long-term coordinated voltage control","authors":"C.B. Gomes, G. Taranto, N. Martins, D. Falcão","doi":"10.1109/PESS.2001.970350","DOIUrl":"https://doi.org/10.1109/PESS.2001.970350","url":null,"abstract":"This paper deals with the analysis of long-term coordinated voltage control. The simulations were performed through the use of a fast simulation tool. Several simulations are performed on a small tutorial illustrative system for easy understanding of the electrical phenomena and control strategies. Simulations are also carried out on a large-size model of the Brazilian system.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122836063","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 : 2001-07-15DOI: 10.1109/PESS.2001.970034
C. Singh, I. Hiskens
Summary form only given as follows. The transients induced in power systems by a large disturbance can initiate unexpected events such as protection operation or converter misfiring. This paper proposes a direct technique for assessing the likelihood of such events. The approach is based on Lyapunov (energy) function methods, but with the critical energy redefined to take account of protection operating characteristics and viability constraints. Power systems have many protection devices and many constraints that must be monitored. The paper provides a method of identifying the subset of protection devices and/or viability constraints that are most vulnerable for any particular disturbance. Controlling UEP (unstable equilibrium point) ideas underlie the algorithm.
{"title":"Direct assessment of protection operation and nonviable transients","authors":"C. Singh, I. Hiskens","doi":"10.1109/PESS.2001.970034","DOIUrl":"https://doi.org/10.1109/PESS.2001.970034","url":null,"abstract":"Summary form only given as follows. The transients induced in power systems by a large disturbance can initiate unexpected events such as protection operation or converter misfiring. This paper proposes a direct technique for assessing the likelihood of such events. The approach is based on Lyapunov (energy) function methods, but with the critical energy redefined to take account of protection operating characteristics and viability constraints. Power systems have many protection devices and many constraints that must be monitored. The paper provides a method of identifying the subset of protection devices and/or viability constraints that are most vulnerable for any particular disturbance. Controlling UEP (unstable equilibrium point) ideas underlie the algorithm.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127005055","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 : 2001-07-15DOI: 10.1109/PESS.2001.970269
A. Lazkano, J. Ruiz, E. Aramendi, L. Leturiondo
This paper presents a new proposal for the detection of arcing faults (AF) and evaluates the detection rate and the security level of the proposed method. This method is based on an analysis of three-phase unbalanced current, feeder 3I/sub 0/, using decomposition of the signal by means of wavelet transform techniques. Combining both temporal and frequency localizing properties, criteria are set in order to detect electric arc existence related to high impedance faults. The method has been tested with signals from staged fault records, normal condition records and substation event records. The test results show that the proposal is a satisfactory fault detection method.
{"title":"Evaluation of a new proposal for arcing fault detection method based on wavelet packet analysis","authors":"A. Lazkano, J. Ruiz, E. Aramendi, L. Leturiondo","doi":"10.1109/PESS.2001.970269","DOIUrl":"https://doi.org/10.1109/PESS.2001.970269","url":null,"abstract":"This paper presents a new proposal for the detection of arcing faults (AF) and evaluates the detection rate and the security level of the proposed method. This method is based on an analysis of three-phase unbalanced current, feeder 3I/sub 0/, using decomposition of the signal by means of wavelet transform techniques. Combining both temporal and frequency localizing properties, criteria are set in order to detect electric arc existence related to high impedance faults. The method has been tested with signals from staged fault records, normal condition records and substation event records. The test results show that the proposal is a satisfactory fault detection method.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121869744","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 : 2001-07-15DOI: 10.1109/PESS.2001.970318
L. D. da Silva, Y. Wang, Wilsun Xu, V.F. da Costal
Open access permits all players to inject real power into a system with few restrictions. As generators also provide reactive power to the system, there is a general conception that their Q-outputs are supportive to system security and should be financially compensated. Our research results show, however, that a generator's Q-output has double-applications. One is to support the shipment of its own active power, and the other is to support system security. Therefore, compensation should be made to the second component only. The main purpose of this paper is to introduce the problem and demonstrate the phenomena of the dual functions of generators Q-output. Simple systems are used to illustrate the phenomena. Analytical separation of the components is presented for these simple systems. Case-specific separation methods are also developed to demonstrate the problem. The paper contributes to introducing the phenomenon, as well as demonstrating its importance for defining fair compensation schemes for reactive power support services. It also shows that methods need to be developed to solve the problem for large-scale real-life power systems, Preliminary, but potential, ideas are discussed.
{"title":"Investigation on the dual functions of generator reactive power support","authors":"L. D. da Silva, Y. Wang, Wilsun Xu, V.F. da Costal","doi":"10.1109/PESS.2001.970318","DOIUrl":"https://doi.org/10.1109/PESS.2001.970318","url":null,"abstract":"Open access permits all players to inject real power into a system with few restrictions. As generators also provide reactive power to the system, there is a general conception that their Q-outputs are supportive to system security and should be financially compensated. Our research results show, however, that a generator's Q-output has double-applications. One is to support the shipment of its own active power, and the other is to support system security. Therefore, compensation should be made to the second component only. The main purpose of this paper is to introduce the problem and demonstrate the phenomena of the dual functions of generators Q-output. Simple systems are used to illustrate the phenomena. Analytical separation of the components is presented for these simple systems. Case-specific separation methods are also developed to demonstrate the problem. The paper contributes to introducing the phenomenon, as well as demonstrating its importance for defining fair compensation schemes for reactive power support services. It also shows that methods need to be developed to solve the problem for large-scale real-life power systems, Preliminary, but potential, ideas are discussed.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132726322","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 : 2001-07-15DOI: 10.1109/PESS.2001.970296
M. Malaki, A. Shirani, H. Siahkali
Unbundling of electricity industry to generation, transmission and distribution as the results of power system restructuring scheme introduced new economical-technical analysis methods for optimal portfolio in the industry. While determination of generation cost can be found by the related cost easily, accurate transmission charges determination is not a straight forward and simple procedure since relates to the path of electricity flow in the network. In this paper, using the help of the tracing flow method, the participation factors of each generator and line to supply a load has been determined. By using this factor and economical data of generating units and transmission lines I the cost of electricity consumption at each node has been determined. Application of the method for determination of connection cost of the new loads while considering dispatching limits, i.e., contingency, congestion, transmission limits, is another part of the paper. At the end part of the paper, the method is applied in a typical network and shows good accuracy and applicability.
{"title":"New approach for determination of the energy and connection cost at the power grid nodes","authors":"M. Malaki, A. Shirani, H. Siahkali","doi":"10.1109/PESS.2001.970296","DOIUrl":"https://doi.org/10.1109/PESS.2001.970296","url":null,"abstract":"Unbundling of electricity industry to generation, transmission and distribution as the results of power system restructuring scheme introduced new economical-technical analysis methods for optimal portfolio in the industry. While determination of generation cost can be found by the related cost easily, accurate transmission charges determination is not a straight forward and simple procedure since relates to the path of electricity flow in the network. In this paper, using the help of the tracing flow method, the participation factors of each generator and line to supply a load has been determined. By using this factor and economical data of generating units and transmission lines I the cost of electricity consumption at each node has been determined. Application of the method for determination of connection cost of the new loads while considering dispatching limits, i.e., contingency, congestion, transmission limits, is another part of the paper. At the end part of the paper, the method is applied in a typical network and shows good accuracy and applicability.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132795673","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 : 2001-07-15DOI: 10.1109/PESS.2001.970162
F. Albuyeh
Summary form only given. In this paper, the authors discuss a price-responsive load electric utility infrastructure that employs existing technology, using the public Internet as the main communication medium. Capability is provided to bring metered demand data from individual loads to the central market operator and/or the aggregator. The capability is also provided to bring market price signals and commands from the market operator to the end use device. Through this infrastructure, load resources can participate in localized or centralized demand management programs. In addition, they can participate in energy and ancillary service markets. The same infrastructure can be used to provide two-way, real-time access between the market operator and distributed generation resource providers.
{"title":"Price responsive load in the de-regulated environment","authors":"F. Albuyeh","doi":"10.1109/PESS.2001.970162","DOIUrl":"https://doi.org/10.1109/PESS.2001.970162","url":null,"abstract":"Summary form only given. In this paper, the authors discuss a price-responsive load electric utility infrastructure that employs existing technology, using the public Internet as the main communication medium. Capability is provided to bring metered demand data from individual loads to the central market operator and/or the aggregator. The capability is also provided to bring market price signals and commands from the market operator to the end use device. Through this infrastructure, load resources can participate in localized or centralized demand management programs. In addition, they can participate in energy and ancillary service markets. The same infrastructure can be used to provide two-way, real-time access between the market operator and distributed generation resource providers.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"253 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133983586","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 : 2001-07-15DOI: 10.1109/PESS.2001.970190
K.Y. Lee, H. Ko
This paper presents an implementation of power system stabilizer using inverse dynamic linear controller. Traditionally, multilayer neural network is used for a universal approximator and applied to a system as a neurocontroller. In this case, at least two neural networks are required and continuous tuning of the neurocontroller is required. Moreover, training of the neural network is required, considering all possible disturbances, which is impractical in real situation. In this paper, an inverse dynamic linear model (IDLM) is introduced to avoid this problem. The inverse dynamic linear controller consists of an IDLM and an error reduction linear model (ERLM). It does not require much time to train the IDLM. Once the IDLM is trained, it does not require retuning for cases with other types of disturbances. The controller is tested for a one machine and infinite-bus power system for various operating conditions.
{"title":"Power system stabilization using a free model based inverse dynamic linear controller","authors":"K.Y. Lee, H. Ko","doi":"10.1109/PESS.2001.970190","DOIUrl":"https://doi.org/10.1109/PESS.2001.970190","url":null,"abstract":"This paper presents an implementation of power system stabilizer using inverse dynamic linear controller. Traditionally, multilayer neural network is used for a universal approximator and applied to a system as a neurocontroller. In this case, at least two neural networks are required and continuous tuning of the neurocontroller is required. Moreover, training of the neural network is required, considering all possible disturbances, which is impractical in real situation. In this paper, an inverse dynamic linear model (IDLM) is introduced to avoid this problem. The inverse dynamic linear controller consists of an IDLM and an error reduction linear model (ERLM). It does not require much time to train the IDLM. Once the IDLM is trained, it does not require retuning for cases with other types of disturbances. The controller is tested for a one machine and infinite-bus power system for various operating conditions.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132045033","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 : 2001-07-15DOI: 10.1109/PESS.2001.969980
Yu Jiang, Shi Dong-yuan, D. Xian-zhong, Tang Yuejin, Cheng Shijie
Due to its ideal electrical behavior, the superconducting fault current limiter (SFCL) has become one of the most important development trends of limiters in power systems. This paper summarizes the main electrical behaviors of SFCL, including the relationship between SFCL's working current and the quench current of the superconducting coil (SC), and the relationship between equivalent fundamental frequency impedance of SFCL and normal state resistance of SC. Operation losses and response time of SFCL are also discussed. The paper analyzes different influences of quench type SFCL and nonquench type SFCL on waveforms and total harmonic distortion (THD) of line current and node measurement impedance. Electromagnetic simulation is adopted to analyze the characteristics of the SFCL.
{"title":"Comparison of superconducting fault current limiter in power system","authors":"Yu Jiang, Shi Dong-yuan, D. Xian-zhong, Tang Yuejin, Cheng Shijie","doi":"10.1109/PESS.2001.969980","DOIUrl":"https://doi.org/10.1109/PESS.2001.969980","url":null,"abstract":"Due to its ideal electrical behavior, the superconducting fault current limiter (SFCL) has become one of the most important development trends of limiters in power systems. This paper summarizes the main electrical behaviors of SFCL, including the relationship between SFCL's working current and the quench current of the superconducting coil (SC), and the relationship between equivalent fundamental frequency impedance of SFCL and normal state resistance of SC. Operation losses and response time of SFCL are also discussed. The paper analyzes different influences of quench type SFCL and nonquench type SFCL on waveforms and total harmonic distortion (THD) of line current and node measurement impedance. Electromagnetic simulation is adopted to analyze the characteristics of the SFCL.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134245676","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 : 2001-07-15DOI: 10.1109/PESS.2001.970141
S. Papathanassiou, N. Hatziargyriou
The penetration of dispersed generation (DG) sources in the grids is constantly increasing, as a result of both technological advancements and institutional changes in the electric power industry. The connection of new installations is often hindered by a variety of factors, including technical considerations and requirements, usually resolved at the expense of the investor. As the interest for installing new generation facilities escalates, the adoption of transparent and easily applicable technical evaluation procedures becomes imperative. In this paper, the methodology and limits adopted in the connection guide of the Greek utility are outlined. Issues addressed are the steady state and fast voltage variations, as well as flicker and harmonic emissions. Simplified evaluation procedures are proposed, largely based on the relevant IEC publications, which are suitable for practical situations.
{"title":"Technical requirements for the connection of dispersed generation to the grid","authors":"S. Papathanassiou, N. Hatziargyriou","doi":"10.1109/PESS.2001.970141","DOIUrl":"https://doi.org/10.1109/PESS.2001.970141","url":null,"abstract":"The penetration of dispersed generation (DG) sources in the grids is constantly increasing, as a result of both technological advancements and institutional changes in the electric power industry. The connection of new installations is often hindered by a variety of factors, including technical considerations and requirements, usually resolved at the expense of the investor. As the interest for installing new generation facilities escalates, the adoption of transparent and easily applicable technical evaluation procedures becomes imperative. In this paper, the methodology and limits adopted in the connection guide of the Greek utility are outlined. Issues addressed are the steady state and fast voltage variations, as well as flicker and harmonic emissions. Simplified evaluation procedures are proposed, largely based on the relevant IEC publications, which are suitable for practical situations.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134558959","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 : 2001-07-15DOI: 10.1109/PESS.2001.970024
G. W. Chang, Shin-Kuan Chen, G. Chen
This paper presents a harmonic-domain method for modeling currents generated by traditional fluorescent lamp with electromagnetic ballast Both the nonlinearity of lamp components and the effect of source voltage distortion on the lamp are taken into account in the proposed model. Simulation results based on the described method are compared with those obtained from experimental tests. It is found that the solutions obtained based on the proposed model agree very well with the experimental test results.
{"title":"Harmonic-domain modeling of fluorescent lamp with electromagnetic ballast","authors":"G. W. Chang, Shin-Kuan Chen, G. Chen","doi":"10.1109/PESS.2001.970024","DOIUrl":"https://doi.org/10.1109/PESS.2001.970024","url":null,"abstract":"This paper presents a harmonic-domain method for modeling currents generated by traditional fluorescent lamp with electromagnetic ballast Both the nonlinearity of lamp components and the effect of source voltage distortion on the lamp are taken into account in the proposed model. Simulation results based on the described method are compared with those obtained from experimental tests. It is found that the solutions obtained based on the proposed model agree very well with the experimental test results.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134560768","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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