Pub Date : 2009-07-26DOI: 10.1109/PES.2009.5275504
A. Abur
This paper describes an interactive software package that has been developed primarily as an educational tool in studying state estimation, bad data and network observability analysis algorithms. In addition to these functions, the software package also supports a power flow function. Power flow function is useful in creation of consistent measurement data to be used by the state estimator. The essential characteristics of the package is its modular structure which allows both replacement of existing applications and introduction of new ones.
{"title":"Power education toolbox (P.E.T): An interactive software package for state estimation","authors":"A. Abur","doi":"10.1109/PES.2009.5275504","DOIUrl":"https://doi.org/10.1109/PES.2009.5275504","url":null,"abstract":"This paper describes an interactive software package that has been developed primarily as an educational tool in studying state estimation, bad data and network observability analysis algorithms. In addition to these functions, the software package also supports a power flow function. Power flow function is useful in creation of consistent measurement data to be used by the state estimator. The essential characteristics of the package is its modular structure which allows both replacement of existing applications and introduction of new ones.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128973379","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 : 2009-07-26DOI: 10.1109/PES.2009.5275534
Gan Li, Xiao-Ping Zhang
This paper reviews analytical and approximate methods in probabilistic load flow studies, and presents a general procedure of these methods. Two of these methods, the cumulant method and the point estimate method, are presented in detail. Moreover, the treatment of probabilistic loads is discussed in detail in the implementation of these methods. A comparison between these two methods is given through both theoretical analysis and case study to show their advantages and disadvantages. Finally, further research needs and application of these methods are also discussed.
{"title":"Comparison between two probabilistic load flow methods for reliability assessment","authors":"Gan Li, Xiao-Ping Zhang","doi":"10.1109/PES.2009.5275534","DOIUrl":"https://doi.org/10.1109/PES.2009.5275534","url":null,"abstract":"This paper reviews analytical and approximate methods in probabilistic load flow studies, and presents a general procedure of these methods. Two of these methods, the cumulant method and the point estimate method, are presented in detail. Moreover, the treatment of probabilistic loads is discussed in detail in the implementation of these methods. A comparison between these two methods is given through both theoretical analysis and case study to show their advantages and disadvantages. Finally, further research needs and application of these methods are also discussed.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124669355","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 : 2009-07-26DOI: 10.1109/PES.2009.5275743
Chengyong Zhao, Chunyi Guo
The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using the PI controller and the nonlinear inverse system. Based on the strategy designed, the transmission limits of active power and reactive power are deduced. According to the circle characteristic of operation represented, it is proved theoretically that the control strategy can independently control the active and reactive power. Case studies are also carried out to testify the control strategy designed using the PSCAD/EMTDC software. Simulation results verify that the power control strategy designed can independently control active power and reactive power and the controllers have rapid responding speed, desirable stability, and highly steady state control accuracy.
{"title":"Complete-independent control strategy of active and reactive power for VSC based HVDC system","authors":"Chengyong Zhao, Chunyi Guo","doi":"10.1109/PES.2009.5275743","DOIUrl":"https://doi.org/10.1109/PES.2009.5275743","url":null,"abstract":"The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using the PI controller and the nonlinear inverse system. Based on the strategy designed, the transmission limits of active power and reactive power are deduced. According to the circle characteristic of operation represented, it is proved theoretically that the control strategy can independently control the active and reactive power. Case studies are also carried out to testify the control strategy designed using the PSCAD/EMTDC software. Simulation results verify that the power control strategy designed can independently control active power and reactive power and the controllers have rapid responding speed, desirable stability, and highly steady state control accuracy.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124719860","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 : 2009-07-26DOI: 10.1109/PES.2009.5275697
J. Mahseredjian, O. Saad, S. Dennetière
This panel paper presents research activities related to modeling portability between electromagnetic transients simulation programs. Although modern computer programs are provided with sophisticated graphical user interfaces, each program has its own modeling interface and model development methods. There are no portability or interoperability standards between applications of the same type. This issue creates significant and time consuming problems for the users since it is often required in the same organization to perform studies using different applications or to receive models available from different manufacturers using different tools. This paper focuses on methods that can be used for developing and establishing modeling portability. Both model data portability and actual model portability are discussed. The topic is also related to user-defined modeling.
{"title":"Computation of power system transients: Modeling portability","authors":"J. Mahseredjian, O. Saad, S. Dennetière","doi":"10.1109/PES.2009.5275697","DOIUrl":"https://doi.org/10.1109/PES.2009.5275697","url":null,"abstract":"This panel paper presents research activities related to modeling portability between electromagnetic transients simulation programs. Although modern computer programs are provided with sophisticated graphical user interfaces, each program has its own modeling interface and model development methods. There are no portability or interoperability standards between applications of the same type. This issue creates significant and time consuming problems for the users since it is often required in the same organization to perform studies using different applications or to receive models available from different manufacturers using different tools. This paper focuses on methods that can be used for developing and establishing modeling portability. Both model data portability and actual model portability are discussed. The topic is also related to user-defined modeling.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124771736","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 : 2009-07-26DOI: 10.1109/PES.2009.5275400
M. Filho, J. de Souza, E. M. Meza
This paper proposes efficient methods for correcting suspicious power system network parameters. State estimation is used for tackling the parameter estimation problem. The proposed methods explore the concept of irrelevant/barely relevant branches to eliminate/mitigate temporarily the participation of suspicious parameters in the state estimation process, until the suspicions are cleared up. Different situations, e.g. the occurrence of single/multiple parameter errors under unavailability of measurements, are handled. The methods distinguish themselves by the construction of a parameter estimation algorithm which does not modify an existing state estimation process, but interacts with it. Results with the IEEE-14 bus system, benchmark network for state estimation studies, and with a real power system are presented to illustrate the application of the proposed methods.
{"title":"Correcting electrical network parameters","authors":"M. Filho, J. de Souza, E. M. Meza","doi":"10.1109/PES.2009.5275400","DOIUrl":"https://doi.org/10.1109/PES.2009.5275400","url":null,"abstract":"This paper proposes efficient methods for correcting suspicious power system network parameters. State estimation is used for tackling the parameter estimation problem. The proposed methods explore the concept of irrelevant/barely relevant branches to eliminate/mitigate temporarily the participation of suspicious parameters in the state estimation process, until the suspicions are cleared up. Different situations, e.g. the occurrence of single/multiple parameter errors under unavailability of measurements, are handled. The methods distinguish themselves by the construction of a parameter estimation algorithm which does not modify an existing state estimation process, but interacts with it. Results with the IEEE-14 bus system, benchmark network for state estimation studies, and with a real power system are presented to illustrate the application of the proposed methods.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129441613","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 : 2009-07-26DOI: 10.1109/PES.2009.5275961
A. S. Leger, C. Nwankpa
Power System network dynamics are often ignored in power system analysis in order to simplify and speed up calculations. Such assumptions can be alleviated with no cost in computation time using analog computation. Analog computation exhibits physically realizable solutions and significantly faster computation times as compared to digital. However, accurate analog models of power system components are required. This paper focuses on the development of an analog transmission line model incorporating time-varying phasors. More specifically, this model was designed for a previously proposed method of analog power system emulation. Prior research with this method has focused on a static representation of transmission lines. The dynamic model, proposed here, is a natural extension of previous work and allows for more accurate power system stability analysis. The model is developed within an analog emulation framework, and verified with simulation via analog behavior modeling in PSpice software.
{"title":"Analog emulation of transmission lines with time-varying phasors","authors":"A. S. Leger, C. Nwankpa","doi":"10.1109/PES.2009.5275961","DOIUrl":"https://doi.org/10.1109/PES.2009.5275961","url":null,"abstract":"Power System network dynamics are often ignored in power system analysis in order to simplify and speed up calculations. Such assumptions can be alleviated with no cost in computation time using analog computation. Analog computation exhibits physically realizable solutions and significantly faster computation times as compared to digital. However, accurate analog models of power system components are required. This paper focuses on the development of an analog transmission line model incorporating time-varying phasors. More specifically, this model was designed for a previously proposed method of analog power system emulation. Prior research with this method has focused on a static representation of transmission lines. The dynamic model, proposed here, is a natural extension of previous work and allows for more accurate power system stability analysis. The model is developed within an analog emulation framework, and verified with simulation via analog behavior modeling in PSpice software.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"2010 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129681033","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 : 2009-07-26DOI: 10.1109/PES.2009.5275630
L. Musaba, P. Naidoo
The development of a regional interconnected power system has contributed to both a best outcome for the economic sharing of scare energy sources and for preparing the market to operate in environments with limited reserve margins. The region has an abundance of thermal coal, widespread solar availability and large rivers for hydroelectric power generation. Wind and ocean energy could be harnessed in limited quantities. The region currently enjoys the worlds lowest cost electrical energy as sourced from low cost thermal coal operated power plants located in South Africa. With increasing customer demands and climate change linked to thermal coal generation, the region has a two fold challenge, provide for more power but without thermal coal and to go back and start to replace thermal coal with more environmentally acceptable alternatives. In this search for an equivalent lower cost primary energy source, the value of the hydroelectric capacity of the major rivers of Southern Africa grows with time. Large scale hydro electric power plants all interconnected by robust transmission emerges as the practical and workable solution to the growing power deficit of an aggressive economy surging forward.
{"title":"Power supply challenges in Southern Africa","authors":"L. Musaba, P. Naidoo","doi":"10.1109/PES.2009.5275630","DOIUrl":"https://doi.org/10.1109/PES.2009.5275630","url":null,"abstract":"The development of a regional interconnected power system has contributed to both a best outcome for the economic sharing of scare energy sources and for preparing the market to operate in environments with limited reserve margins. The region has an abundance of thermal coal, widespread solar availability and large rivers for hydroelectric power generation. Wind and ocean energy could be harnessed in limited quantities. The region currently enjoys the worlds lowest cost electrical energy as sourced from low cost thermal coal operated power plants located in South Africa. With increasing customer demands and climate change linked to thermal coal generation, the region has a two fold challenge, provide for more power but without thermal coal and to go back and start to replace thermal coal with more environmentally acceptable alternatives. In this search for an equivalent lower cost primary energy source, the value of the hydroelectric capacity of the major rivers of Southern Africa grows with time. Large scale hydro electric power plants all interconnected by robust transmission emerges as the practical and workable solution to the growing power deficit of an aggressive economy surging forward.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130355970","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 : 2009-07-26DOI: 10.1109/PES.2009.5275900
K. Schneider, Y. Chen, D. Engle, D. Chassin
This paper presents a set of radial distribution test feeders that are representative of those found in the various regions of the Continental United States. The purpose of publishing these distribution feeder models is to facilitate the analysis of new smart grid technologies.
{"title":"A Taxonomy of North American radial distribution feeders","authors":"K. Schneider, Y. Chen, D. Engle, D. Chassin","doi":"10.1109/PES.2009.5275900","DOIUrl":"https://doi.org/10.1109/PES.2009.5275900","url":null,"abstract":"This paper presents a set of radial distribution test feeders that are representative of those found in the various regions of the Continental United States. The purpose of publishing these distribution feeder models is to facilitate the analysis of new smart grid technologies.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"488 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127017281","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 : 2009-07-26DOI: 10.1109/PES.2009.5275401
B. Buchholz, D. Nestle, A. Kießling
With respect to the political 20-20-20 goals of the European Union, the structure of the electricity network is subject to major changes. The German legal framework has encouraged the installation and operation of renewable energy systems and cogeneration units. As a consequence, in the city of Mannheim, Germany, more and more distributed generators feed into the distribution grid. In September 2008, more than 300 small PV systems and cogeneration units have been connected to the distribution grid, with a steadily rising number and installed capacity. The distribution grid can still host that number and capacity of distributed generation without any major integration efforts. However, to reach the above mentioned political goals, the electricity grid planners will face the challenge to integrate a much higher number of distributed generators as well as higher fluctuating capacity while maintaining and even improving reliability and security of supply. In 2007, the German government has launched the technology program “E-Energy” [1]. Six research teams are currently developing new ICT infrastructures for six model regions in order to increase the efficiency of the energy system with ICT as enabling technology. This paper elaborates on the decentralized approach for a virtual power plant that researchers will apply to the city of Mannheim as one model city. Chapter 1 explains the role of individual customers who cooperate in a swarm like an organism. Chapter 2 provides the technical concept behind the new system architecture. Chapter 3 shows first experiences with the field test in Mannheim and Chapter 4 concludes the paper.
{"title":"Individual customers' influence on the operation of virtual power plants","authors":"B. Buchholz, D. Nestle, A. Kießling","doi":"10.1109/PES.2009.5275401","DOIUrl":"https://doi.org/10.1109/PES.2009.5275401","url":null,"abstract":"With respect to the political 20-20-20 goals of the European Union, the structure of the electricity network is subject to major changes. The German legal framework has encouraged the installation and operation of renewable energy systems and cogeneration units. As a consequence, in the city of Mannheim, Germany, more and more distributed generators feed into the distribution grid. In September 2008, more than 300 small PV systems and cogeneration units have been connected to the distribution grid, with a steadily rising number and installed capacity. The distribution grid can still host that number and capacity of distributed generation without any major integration efforts. However, to reach the above mentioned political goals, the electricity grid planners will face the challenge to integrate a much higher number of distributed generators as well as higher fluctuating capacity while maintaining and even improving reliability and security of supply. In 2007, the German government has launched the technology program “E-Energy” [1]. Six research teams are currently developing new ICT infrastructures for six model regions in order to increase the efficiency of the energy system with ICT as enabling technology. This paper elaborates on the decentralized approach for a virtual power plant that researchers will apply to the city of Mannheim as one model city. Chapter 1 explains the role of individual customers who cooperate in a swarm like an organism. Chapter 2 provides the technical concept behind the new system architecture. Chapter 3 shows first experiences with the field test in Mannheim and Chapter 4 concludes the paper.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123880241","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 : 2009-07-26DOI: 10.1109/PES.2009.5260224
A. Kechroud, J. Myrzik, W. Kling
Voltage control is traditionally achieved through reactive power control, mainly because of the inductive nature of the transmission grids. However, when considering distribution networks, reactive power may not be an effective mean for voltage control. This is because of the X/R ratio which determines the controllability of voltage through active and/or reactive power. Therefore, in this paper a voltage control scheme is proposed based on the estimation of the X/R ratio of the grid. The estimated X/R will then be used to determine the active and reactive power to be injected into the grid in order to keep the voltage between permissible limits.
{"title":"A power system equivalent impedance based voltage control","authors":"A. Kechroud, J. Myrzik, W. Kling","doi":"10.1109/PES.2009.5260224","DOIUrl":"https://doi.org/10.1109/PES.2009.5260224","url":null,"abstract":"Voltage control is traditionally achieved through reactive power control, mainly because of the inductive nature of the transmission grids. However, when considering distribution networks, reactive power may not be an effective mean for voltage control. This is because of the X/R ratio which determines the controllability of voltage through active and/or reactive power. Therefore, in this paper a voltage control scheme is proposed based on the estimation of the X/R ratio of the grid. The estimated X/R will then be used to determine the active and reactive power to be injected into the grid in order to keep the voltage between permissible limits.","PeriodicalId":258632,"journal":{"name":"2009 IEEE Power & Energy Society General Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124202206","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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