Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)最新文献
Pub Date : 1999-05-16DOI: 10.1109/PICA.1999.779399
I. Roytelman, V. Ganesan
Local automatic controllers are an integral part of a modern distribution system. They control transformer load tap changer (LTC) positions and the status of switched capacitors to ensure voltage and loading constraints are satisfied under changing operating conditions. Distribution network applications, which traditionally have been used for planning, account for the presence of local controllers in a simplified manner. Distribution management systems (DMS) bring network applications to the operational practice which requires much more detailed modeling of local controllers, both for the purpose of real-time power flow monitoring, and for centralized control. In the latter case, the local controllers create both opportunities and restrictions for DMS optimization functions such as volt/VAr control and feeder reconfiguration. This paper describes how the LTC and capacitor local controllers are modeled as a part of the power flow solution, and how they interact and affect DMS optimization functions. The impact of the local controller modeling on power flow, volt/VAr control and feeder reconfiguration is illustrated by numerical examples.
{"title":"Modeling of local controllers in distribution network applications","authors":"I. Roytelman, V. Ganesan","doi":"10.1109/PICA.1999.779399","DOIUrl":"https://doi.org/10.1109/PICA.1999.779399","url":null,"abstract":"Local automatic controllers are an integral part of a modern distribution system. They control transformer load tap changer (LTC) positions and the status of switched capacitors to ensure voltage and loading constraints are satisfied under changing operating conditions. Distribution network applications, which traditionally have been used for planning, account for the presence of local controllers in a simplified manner. Distribution management systems (DMS) bring network applications to the operational practice which requires much more detailed modeling of local controllers, both for the purpose of real-time power flow monitoring, and for centralized control. In the latter case, the local controllers create both opportunities and restrictions for DMS optimization functions such as volt/VAr control and feeder reconfiguration. This paper describes how the LTC and capacitor local controllers are modeled as a part of the power flow solution, and how they interact and affect DMS optimization functions. The impact of the local controller modeling on power flow, volt/VAr control and feeder reconfiguration is illustrated by numerical examples.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115189676","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 : 1999-05-16DOI: 10.1109/PICA.1999.779390
G. Nativel, Y. Jacquemart, V. Sermanson, G. Nerin
Optimal operation of an electrical power system requires complete control of the economic impact of security and raises the question of the accurate estimation of the risks. Therefore, the ability of an electric utility to achieve these goals in the context of more and more complex power systems will be a major factor of competitiveness. With this in mind, EDF has decided to develop a voltage security assessment tool. This software is based on a fast time domain simulation engine, which has been embedded in the EDF grid security analysis framework. Its main features are the simulation of voltage stability phenomena and slow dynamics, the computation of different kinds of security margins, the suggestion and the validation of corrective actions. It is being experimented upon in the French national control center, where it should be used to prepare the system operation, specially the day before, as well as in an online environment.
{"title":"Integrated framework for voltage security assessment","authors":"G. Nativel, Y. Jacquemart, V. Sermanson, G. Nerin","doi":"10.1109/PICA.1999.779390","DOIUrl":"https://doi.org/10.1109/PICA.1999.779390","url":null,"abstract":"Optimal operation of an electrical power system requires complete control of the economic impact of security and raises the question of the accurate estimation of the risks. Therefore, the ability of an electric utility to achieve these goals in the context of more and more complex power systems will be a major factor of competitiveness. With this in mind, EDF has decided to develop a voltage security assessment tool. This software is based on a fast time domain simulation engine, which has been embedded in the EDF grid security analysis framework. Its main features are the simulation of voltage stability phenomena and slow dynamics, the computation of different kinds of security margins, the suggestion and the validation of corrective actions. It is being experimented upon in the French national control center, where it should be used to prepare the system operation, specially the day before, as well as in an online environment.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114699459","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 : 1999-05-16DOI: 10.1109/PICA.1999.779509
A. Apostolov, C. Duffy
The electric power industry is in the process of intensive integration of intelligent electronic devices in substations and power systems. The success of this effort is to a great extent a function of the development of a universal platform that will allow microprocessor based protection and control devices to interoperate over the substation local area network or the utility wide area network. The paper describes the concept of modeling multifunctional advanced transformer protection relays based on the principles and basic relay object models developed as part of the utilities communications architecture. Object models with different levels of complexity are used to build the model of a transformer protection relay with multiple restrained inputs.
{"title":"Object modeling of multifunctional transformer protection relays","authors":"A. Apostolov, C. Duffy","doi":"10.1109/PICA.1999.779509","DOIUrl":"https://doi.org/10.1109/PICA.1999.779509","url":null,"abstract":"The electric power industry is in the process of intensive integration of intelligent electronic devices in substations and power systems. The success of this effort is to a great extent a function of the development of a universal platform that will allow microprocessor based protection and control devices to interoperate over the substation local area network or the utility wide area network. The paper describes the concept of modeling multifunctional advanced transformer protection relays based on the principles and basic relay object models developed as part of the utilities communications architecture. Object models with different levels of complexity are used to build the model of a transformer protection relay with multiple restrained inputs.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134520900","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 : 1999-05-16DOI: 10.1109/PICA.1999.779511
P. Georgilakis, N. Hatziargyriou, A. Doulamis, N. Doulamis, S. Kollias
In this paper a neural network based framework is developed for predicting core losses of wound core distribution transformers at the early stages of transformer construction. The proposed framework is also used to improve the grouping process of the individual cores so as to reduce the variation in core loss of assembled transformer. Several neural network structures and the respective training sets have been stored in a database, corresponding to the various magnetic materials. Selection of the most appropriate network from the database is relied on the satisfaction of customers' requirements and several technical and economical criteria. In case that the network performance is not satisfactory, a small adaptation of the retrieved network weights is performed. A decision tree methodology has been adopted to select the most appropriate attributes used as input vectors to the neural networks. Significant improvement of core loss prediction is observed in comparison to the current practice.
{"title":"A neural network framework for predicting transformer core losses","authors":"P. Georgilakis, N. Hatziargyriou, A. Doulamis, N. Doulamis, S. Kollias","doi":"10.1109/PICA.1999.779511","DOIUrl":"https://doi.org/10.1109/PICA.1999.779511","url":null,"abstract":"In this paper a neural network based framework is developed for predicting core losses of wound core distribution transformers at the early stages of transformer construction. The proposed framework is also used to improve the grouping process of the individual cores so as to reduce the variation in core loss of assembled transformer. Several neural network structures and the respective training sets have been stored in a database, corresponding to the various magnetic materials. Selection of the most appropriate network from the database is relied on the satisfaction of customers' requirements and several technical and economical criteria. In case that the network performance is not satisfactory, a small adaptation of the retrieved network weights is performed. A decision tree methodology has been adopted to select the most appropriate attributes used as input vectors to the neural networks. Significant improvement of core loss prediction is observed in comparison to the current practice.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133462488","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 : 1999-05-16DOI: 10.1109/PICA.1999.779514
Hang Liu, A. Bose, V. Venkatasubramanian
This paper presents a fast method for use in online voltage security assessment. The objective here is to quickly assess the effects of large numbers of contingencies (line outages) to determine the worst case. The methodology is intuitively focused on the relationship between a node voltage and the availability of reactive power in the local neighborhood, and it also takes advantage of other information from the power flow solution. The concept of electrical distance is introduced for choosing the corresponding voltage control area locally around the contingency event. For the calculation of post-contingency electrical distance and power flow, the computation efficiency can be achieved by utilizing many mature algorithms from static security analysis (SSA).
{"title":"A fast voltage security assessment method using adaptive bounding","authors":"Hang Liu, A. Bose, V. Venkatasubramanian","doi":"10.1109/PICA.1999.779514","DOIUrl":"https://doi.org/10.1109/PICA.1999.779514","url":null,"abstract":"This paper presents a fast method for use in online voltage security assessment. The objective here is to quickly assess the effects of large numbers of contingencies (line outages) to determine the worst case. The methodology is intuitively focused on the relationship between a node voltage and the availability of reactive power in the local neighborhood, and it also takes advantage of other information from the power flow solution. The concept of electrical distance is introduced for choosing the corresponding voltage control area locally around the contingency event. For the calculation of post-contingency electrical distance and power flow, the computation efficiency can be achieved by utilizing many mature algorithms from static security analysis (SSA).","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130104468","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 : 1999-05-16DOI: 10.1109/PICA.1999.779408
F. Albuyeh, Z. Alaywan
The assembly bill 1890, signed in September 1996, opening the California electricity industry to open competition, required the creation of an independent system operator and a power exchange. The first contract for the implementation of the California ISO was signed in December of 1996, and subsequent contracts were signed on March 31, 1997. The California ISO started commercial operation on March 31, 1998 and in its first few months of operation has proven its viability. This paper provides an overview of the California ISO.
{"title":"Implementation of the California independent system operator","authors":"F. Albuyeh, Z. Alaywan","doi":"10.1109/PICA.1999.779408","DOIUrl":"https://doi.org/10.1109/PICA.1999.779408","url":null,"abstract":"The assembly bill 1890, signed in September 1996, opening the California electricity industry to open competition, required the creation of an independent system operator and a power exchange. The first contract for the implementation of the California ISO was signed in December of 1996, and subsequent contracts were signed on March 31, 1997. The California ISO started commercial operation on March 31, 1998 and in its first few months of operation has proven its viability. This paper provides an overview of the California ISO.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116635677","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 : 1999-05-16DOI: 10.1109/PICA.1999.779381
X. Guan, F. Gao, A. Svoboda
The generation schedules obtained in traditional hydrothermal scheduling or unit commitment programs are in hourly generation levels. In the new deregulated power market, the power transactions are processed in terms of hourly energy delivery. Failing to fulfil scheduled energy delivery may result in a penalty to power producers. This paper shows that although ramp-rate constraints are satisfied in hydrothermal scheduling, taking a generation level schedule as an energy delivery schedule may not be realizable. Based on the maximum principle in optimal control theory, the energy delivery capacity across the scheduling horizon is established as a set of recursive equations with given ramp-rate constraints. A sufficient and necessary condition is obtained to check if an energy delivery schedule is realizable. Based on this condition, two cases, where ramp-rate constraints are both satisfied, are analyzed and an unrealizable energy delivery schedule is observed.
{"title":"Energy delivery capacity and generation scheduling in the deregulated electric power market","authors":"X. Guan, F. Gao, A. Svoboda","doi":"10.1109/PICA.1999.779381","DOIUrl":"https://doi.org/10.1109/PICA.1999.779381","url":null,"abstract":"The generation schedules obtained in traditional hydrothermal scheduling or unit commitment programs are in hourly generation levels. In the new deregulated power market, the power transactions are processed in terms of hourly energy delivery. Failing to fulfil scheduled energy delivery may result in a penalty to power producers. This paper shows that although ramp-rate constraints are satisfied in hydrothermal scheduling, taking a generation level schedule as an energy delivery schedule may not be realizable. Based on the maximum principle in optimal control theory, the energy delivery capacity across the scheduling horizon is established as a set of recursive equations with given ramp-rate constraints. A sufficient and necessary condition is obtained to check if an energy delivery schedule is realizable. Based on this condition, two cases, where ramp-rate constraints are both satisfied, are analyzed and an unrealizable energy delivery schedule is observed.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128663339","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 : 1999-05-16DOI: 10.1109/PICA.1999.779407
S. Clermont
Hydro-Quebec is in the process of renewing its SCADA/EMS. Part of this work involves interfacing existing external systems that perform various applications such as state estimation, power flow and stability limit calculations to the new SCADA/EMS. These systems run on various platforms and operating systems. They were developed in-house or by different vendors. When initiated, in 1995, the primary goal of the interface subproject, was to minimize the modifications to the existing systems and the customization of the new SCADA/EMS. It sought to find standard interface components: protocol, exchange format, data dictionary, etc. At that time, standards such as ICCP and models such as CIM were immature. An in-house protocol both at the application and at the communication level was found best. Such a protocol was defined jointly with the vendor, based on the principles of the IDEC protocol. This article presents the challenges met from our decisions of developing in-house solution and from our initial goals. The article describes these challenges in terms of protocol, data formats and data modeling. It discusses the lessons we have learned and what we would do differently, especially in the light of standard development.
{"title":"Lessons learned: interfacing existing external systems to new EMS","authors":"S. Clermont","doi":"10.1109/PICA.1999.779407","DOIUrl":"https://doi.org/10.1109/PICA.1999.779407","url":null,"abstract":"Hydro-Quebec is in the process of renewing its SCADA/EMS. Part of this work involves interfacing existing external systems that perform various applications such as state estimation, power flow and stability limit calculations to the new SCADA/EMS. These systems run on various platforms and operating systems. They were developed in-house or by different vendors. When initiated, in 1995, the primary goal of the interface subproject, was to minimize the modifications to the existing systems and the customization of the new SCADA/EMS. It sought to find standard interface components: protocol, exchange format, data dictionary, etc. At that time, standards such as ICCP and models such as CIM were immature. An in-house protocol both at the application and at the communication level was found best. Such a protocol was defined jointly with the vendor, based on the principles of the IDEC protocol. This article presents the challenges met from our decisions of developing in-house solution and from our initial goals. The article describes these challenges in terms of protocol, data formats and data modeling. It discusses the lessons we have learned and what we would do differently, especially in the light of standard development.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125454155","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 : 1999-05-16DOI: 10.1109/PICA.1999.779404
M. Madrigal, V. Quintana
An interior-point/cutting-plane method for nondifferentiable optimization is used to solve the dual to a unit commitment problem. The interior-point/cutting plane method has two advantages over previous approaches, such as the sub-gradient and bundle methods: first, it has better convergence characteristics; and second, does not suffer from the parameter-tunning drawback. The results of performance testing using systems with up to 104 units confirm the superiority of the interior-point/cutting-plane method over previous approaches.
{"title":"An interior-point/cutting-plane method to solve unit commitment problems","authors":"M. Madrigal, V. Quintana","doi":"10.1109/PICA.1999.779404","DOIUrl":"https://doi.org/10.1109/PICA.1999.779404","url":null,"abstract":"An interior-point/cutting-plane method for nondifferentiable optimization is used to solve the dual to a unit commitment problem. The interior-point/cutting plane method has two advantages over previous approaches, such as the sub-gradient and bundle methods: first, it has better convergence characteristics; and second, does not suffer from the parameter-tunning drawback. The results of performance testing using systems with up to 104 units confirm the superiority of the interior-point/cutting-plane method over previous approaches.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125332523","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 : 1999-05-16DOI: 10.1109/PICA.1999.779401
G. de Cruz, S. Soares
This paper presents a general composite representation of hydroelectric power systems for long-term hydrothermal generation scheduling. The general representation is based on the aggregation of the hydro system through nonlinear reservoir operational rules. A procedure for determining effective rules based on the solution of a deterministic hydrothermal scheduling model is established. In order to evaluate the improvement in hydro generation, the composite representation with nonlinear reservoir operational rules is compared to the traditional linear one for hydroelectric systems with different dimensions (up to 29 hydro plants) taken from the Brazilian southeast power system. The results show a significant improvement in hydro generation.
{"title":"General composite representation of hydroelectric systems","authors":"G. de Cruz, S. Soares","doi":"10.1109/PICA.1999.779401","DOIUrl":"https://doi.org/10.1109/PICA.1999.779401","url":null,"abstract":"This paper presents a general composite representation of hydroelectric power systems for long-term hydrothermal generation scheduling. The general representation is based on the aggregation of the hydro system through nonlinear reservoir operational rules. A procedure for determining effective rules based on the solution of a deterministic hydrothermal scheduling model is established. In order to evaluate the improvement in hydro generation, the composite representation with nonlinear reservoir operational rules is compared to the traditional linear one for hydroelectric systems with different dimensions (up to 29 hydro plants) taken from the Brazilian southeast power system. The results show a significant improvement in hydro generation.","PeriodicalId":113146,"journal":{"name":"Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126561193","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}
Proceedings of the 21st International Conference on Power Industry Computer Applications. Connecting Utilities. PICA 99. To the Millennium and Beyond (Cat. No.99CH36351)
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