Pub Date : 2001-07-15DOI: 10.1109/PESS.2001.970302
B. Jeyasurya
Electric power engineering education is facing a crisis. There is significant decline in enrolments in power courses at many universities. If this trend continues, the power industry will face shortage of trained engineering personnel. This paper explains how students are introduced to the basic concepts in power engineering in the early part of their academic program. Specifically, a course on numerical analysis is used to expose the students to various challenges in power system analysis and operation.
{"title":"Introduction to electric power engineering using numerical methods for electrical engineers","authors":"B. Jeyasurya","doi":"10.1109/PESS.2001.970302","DOIUrl":"https://doi.org/10.1109/PESS.2001.970302","url":null,"abstract":"Electric power engineering education is facing a crisis. There is significant decline in enrolments in power courses at many universities. If this trend continues, the power industry will face shortage of trained engineering personnel. This paper explains how students are introduced to the basic concepts in power engineering in the early part of their academic program. Specifically, a course on numerical analysis is used to expose the students to various challenges in power system analysis and operation.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"94 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":"126818452","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.2001.970069
T.E. Kim, J.E. Kim
This paper describes a new method for determining the introduction limit of DGS (distributed generation system) when DGS is introduced into distribution system of which the voltage is generally controlled by LCT (load-tap changing transformer) and LDC (line drop compensator). Nowadays, small scale DGS is being introduced into power distribution systems. But in that case, it is difficult to properly maintain the terminal voltage of low voltage customers within a permissible range. This paper reveals some correlations between the traditional voltage regulation method by LCT and LDC and the output of DGS, and also presents a method for determining the permissible introduction limit of DGS under proper voltage regulation of the power distribution system. This proposed method is applied to a 22.9 kV class power distribution system, and its validity is proofed through the simulation results.
{"title":"A method for determining the introduction limit of distributed generation system in distribution system","authors":"T.E. Kim, J.E. Kim","doi":"10.1109/PESS.2001.970069","DOIUrl":"https://doi.org/10.1109/PESS.2001.970069","url":null,"abstract":"This paper describes a new method for determining the introduction limit of DGS (distributed generation system) when DGS is introduced into distribution system of which the voltage is generally controlled by LCT (load-tap changing transformer) and LDC (line drop compensator). Nowadays, small scale DGS is being introduced into power distribution systems. But in that case, it is difficult to properly maintain the terminal voltage of low voltage customers within a permissible range. This paper reveals some correlations between the traditional voltage regulation method by LCT and LDC and the output of DGS, and also presents a method for determining the permissible introduction limit of DGS under proper voltage regulation of the power distribution system. This proposed method is applied to a 22.9 kV class power distribution system, and its validity is proofed through the simulation results.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"7 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":"123155743","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}
Setting protective devices in the power distribution system involves a lot of trial and error to find the most desirable solution. This paper discusses the nature of the problem and proposes a heuristic rules-guided search method achieving the high efficiency in setting and coordination. Heuristic rules developed in this study utilize pattern information of backup and primary combination. Effectiveness of the proposed method is demonstrated through many tests on real systems.
{"title":"A new efficient setting method for protective devices in distribution systems using heuristic rules","authors":"Seung-Jae Lee, Myeon-Song Choi, Bok-Shin Ahn, Nam-Sun Yoon","doi":"10.1109/PESS.2001.970234","DOIUrl":"https://doi.org/10.1109/PESS.2001.970234","url":null,"abstract":"Setting protective devices in the power distribution system involves a lot of trial and error to find the most desirable solution. This paper discusses the nature of the problem and proposes a heuristic rules-guided search method achieving the high efficiency in setting and coordination. Heuristic rules developed in this study utilize pattern information of backup and primary combination. Effectiveness of the proposed method is demonstrated through many tests on real systems.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"60 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":"126352174","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.2001.970242
P. Garcia, J. Pereira, S. Carneiro
Summary form only given, as follows. This paper presents the development of mathematical models for thyristor controlled series compensators (TCSCs), for voltage regulator devices and for remote bus voltage control that are suitable to be used with the three-phase current injection method (TCIM) for power flow calculation. TCIM is a Newton method where the equations are written in rectangular coordinates resulting in a 6n /spl times/ 6n Jacobian matrix. The representation of a control device requires an augmented system of equations to incorporate the additional relationship between each control action and the controlled variable, resulting in an augmented Jacobian matrix. Practical distribution systems are tested and the effectiveness of the proposed formulation is demonstrated.
{"title":"Voltage control devices models for distribution power flow analysis","authors":"P. Garcia, J. Pereira, S. Carneiro","doi":"10.1109/PESS.2001.970242","DOIUrl":"https://doi.org/10.1109/PESS.2001.970242","url":null,"abstract":"Summary form only given, as follows. This paper presents the development of mathematical models for thyristor controlled series compensators (TCSCs), for voltage regulator devices and for remote bus voltage control that are suitable to be used with the three-phase current injection method (TCIM) for power flow calculation. TCIM is a Newton method where the equations are written in rectangular coordinates resulting in a 6n /spl times/ 6n Jacobian matrix. The representation of a control device requires an augmented system of equations to incorporate the additional relationship between each control action and the controlled variable, resulting in an augmented Jacobian matrix. Practical distribution systems are tested and the effectiveness of the proposed formulation is demonstrated.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"94 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":"126436325","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.2001.970287
E. Solodovnik, G. Cokkidnides, R. Dougal, A. Meliopoulos
A new technique has been developed that uses symbolically assisted computations to automatically construct time domain power system component models. The generated models are in the algebraic companion form (ACF). The ACF is a generalization of the resistive companion form that is widely used in time-domain simulators. It is based on a quadratic representation of the across/through variable relationship, which results in improved robustness and computational efficiency especially for large scale nonlinear system applications. Manual construction of ACF models is time consuming since it requires computation of both first and second partial derivatives of all through variables with respect to all across variables. This task is simplified using the automatic differentiation technique (ADT). This modeling tool has been implemented within the virtual test bed (VTB) simulation environment. The VTB is an interactive simulation environment which allows analysis of mixed discipline systems and provides advanced visualization capabilities. The ADT models allows users to easily generate their own efficient VTB models by just typing in the continuous domain differential equations expressing the through variables with respect to the across variables. In order to demonstrate the presented methodology, several examples of ADT generated ACF models are presented.
{"title":"Nonlinear power system component modeling using symbolically assisted computations","authors":"E. Solodovnik, G. Cokkidnides, R. Dougal, A. Meliopoulos","doi":"10.1109/PESS.2001.970287","DOIUrl":"https://doi.org/10.1109/PESS.2001.970287","url":null,"abstract":"A new technique has been developed that uses symbolically assisted computations to automatically construct time domain power system component models. The generated models are in the algebraic companion form (ACF). The ACF is a generalization of the resistive companion form that is widely used in time-domain simulators. It is based on a quadratic representation of the across/through variable relationship, which results in improved robustness and computational efficiency especially for large scale nonlinear system applications. Manual construction of ACF models is time consuming since it requires computation of both first and second partial derivatives of all through variables with respect to all across variables. This task is simplified using the automatic differentiation technique (ADT). This modeling tool has been implemented within the virtual test bed (VTB) simulation environment. The VTB is an interactive simulation environment which allows analysis of mixed discipline systems and provides advanced visualization capabilities. The ADT models allows users to easily generate their own efficient VTB models by just typing in the continuous domain differential equations expressing the through variables with respect to the across variables. In order to demonstrate the presented methodology, several examples of ADT generated ACF models are presented.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"104 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":"122585158","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.2001.970220
M. Kezunovic
This paper focuses on voltage sags. It introduces an automated approach to the analysis of voltage sags, their causes and impacts. The sag analysis is performed using software tools developed for this purpose. First, the software performs detection, classification and characterization of voltage sags. Next, if the voltage sag is caused by a fault, the software finds the fault location. Finally the software allows replaying of the sag waveforms for the purpose of evaluating of the impacts on equipment operation.
{"title":"Automated analysis of voltage sags, their causes and impacts","authors":"M. Kezunovic","doi":"10.1109/PESS.2001.970220","DOIUrl":"https://doi.org/10.1109/PESS.2001.970220","url":null,"abstract":"This paper focuses on voltage sags. It introduces an automated approach to the analysis of voltage sags, their causes and impacts. The sag analysis is performed using software tools developed for this purpose. First, the software performs detection, classification and characterization of voltage sags. Next, if the voltage sag is caused by a fault, the software finds the fault location. Finally the software allows replaying of the sag waveforms for the purpose of evaluating of the impacts on equipment operation.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"28 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":"122193757","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.2001.970105
L. Kojovic
If current transformer (CT) characteristics are not properly selected for fault conditions, saturation will occur and relays can misoperate. To help protection engineers select the appropriate CT, the IEEE published two documents on CT performance and application. This paper compares the guidelines in these two documents and suggests modifications that will make CT selection easier and more realistically estimate CT time-to-saturation.
{"title":"Guidelines for current transformers selection for protection systems","authors":"L. Kojovic","doi":"10.1109/PESS.2001.970105","DOIUrl":"https://doi.org/10.1109/PESS.2001.970105","url":null,"abstract":"If current transformer (CT) characteristics are not properly selected for fault conditions, saturation will occur and relays can misoperate. To help protection engineers select the appropriate CT, the IEEE published two documents on CT performance and application. This paper compares the guidelines in these two documents and suggests modifications that will make CT selection easier and more realistically estimate CT time-to-saturation.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"11 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":"122290965","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.2001.970061
A. Abur, F. Magnago
This paper investigates the meter placement problem from the system static security point of view. It develops a strategy for optimal placement of meters so that the overall network will remain observable under possible single contingencies as well as loss of single measurements. The method is implemented and tested on small scale examples with success.
{"title":"Optimal meter placement against contingencies","authors":"A. Abur, F. Magnago","doi":"10.1109/PESS.2001.970061","DOIUrl":"https://doi.org/10.1109/PESS.2001.970061","url":null,"abstract":"This paper investigates the meter placement problem from the system static security point of view. It develops a strategy for optimal placement of meters so that the overall network will remain observable under possible single contingencies as well as loss of single measurements. The method is implemented and tested on small scale examples with success.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"32 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":"122298758","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.2001.970152
A. Ludbrook
The Standard IEEE 519-1992 entitled "IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems" (RP 519-1992) sets harmonic current goals for individual consumers and harmonic voltage goals for utilities at the point of common coupling (PCC). The relationship between the two sets of goals is not stated. Therefore, this paper proposes a method of logically linking harmonic current goals for buyers to whatever harmonic voltage goals are finally chosen for sellers.
{"title":"IEEE 519-harmonic current goals and diversity-a proposal","authors":"A. Ludbrook","doi":"10.1109/PESS.2001.970152","DOIUrl":"https://doi.org/10.1109/PESS.2001.970152","url":null,"abstract":"The Standard IEEE 519-1992 entitled \"IEEE Recommended Practices and Requirements for Harmonic Control in Electric Power Systems\" (RP 519-1992) sets harmonic current goals for individual consumers and harmonic voltage goals for utilities at the point of common coupling (PCC). The relationship between the two sets of goals is not stated. Therefore, this paper proposes a method of logically linking harmonic current goals for buyers to whatever harmonic voltage goals are finally chosen for sellers.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"10 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":"126039388","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.2001.970051
Vikram S. Budhraja
California's new competitive market with independent system operator (ISO), power exchange (PX) and retail choice began operating on March 31, 1998. By and large, the first 2 years of operation were relatively uneventful. While there were early experiences with market volatility, none were terribly surprising, given the unprecedented magnitude of changes from a regulated to competitive electric market structure. Several adjustments were made to ISO and PX rules to address start-up problems and these appeared to work until the summer of 2000. The summer of 2000 was a rude awakening. The market broke down and the hopes for a smooth transition to competitive markets for electricity in California were dashed. In this paper, an overview of California's electricity crisis is presented by the author.
{"title":"California's electricity crisis","authors":"Vikram S. Budhraja","doi":"10.1109/PESS.2001.970051","DOIUrl":"https://doi.org/10.1109/PESS.2001.970051","url":null,"abstract":"California's new competitive market with independent system operator (ISO), power exchange (PX) and retail choice began operating on March 31, 1998. By and large, the first 2 years of operation were relatively uneventful. While there were early experiences with market volatility, none were terribly surprising, given the unprecedented magnitude of changes from a regulated to competitive electric market structure. Several adjustments were made to ISO and PX rules to address start-up problems and these appeared to work until the summer of 2000. The summer of 2000 was a rude awakening. The market broke down and the hopes for a smooth transition to competitive markets for electricity in California were dashed. In this paper, an overview of California's electricity crisis is presented by the author.","PeriodicalId":273578,"journal":{"name":"2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262)","volume":"2 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":"116781015","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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