Pub Date : 1995-05-07DOI: 10.1109/PICA.1995.515271
M. Kezunovic, B. Perunicic
This paper introduces a new approach to power system fault analysis using synchronized sampling. A digital fault recorder with a Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a power transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.
{"title":"Automated transmission line fault analysis using synchronized sampling at two ends","authors":"M. Kezunovic, B. Perunicic","doi":"10.1109/PICA.1995.515271","DOIUrl":"https://doi.org/10.1109/PICA.1995.515271","url":null,"abstract":"This paper introduces a new approach to power system fault analysis using synchronized sampling. A digital fault recorder with a Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a power transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127804201","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 : 1995-05-07DOI: 10.1109/PICA.1995.515171
Hua Wei, Hiroshi Sasaki, Takeshi Nagata
This paper presents a new interior point quadratic programming algorithm which can solve power system optimization problems with significantly less computational efforts. The proposed algorithm has the following two special features. First, it is based on the path-following interior point algorithm whose search direction is the Newton direction, and therefore the algorithm has quadratic convergence. In the second place, it solves directly a symmetric indefinite system and thus the algorithm avoids the formation of [AD/sup -1/A/sup T/] and as a result generates fewer fill-ins than the case of factorizing the positive definite system matrix for large scale power systems. This has brought about a profound speed-up. Since the formulae of the interior point method have been deduced more generally, the proposed algorithm can start from either a feasible (interior point) or an infeasible point (noninterior point). Numerical results on the IEEE test systems and a Japanese 344 bus system have verified that the proposed algorithm possesses enough robustness and needs significantly less solution time compared with already reported applications of the interior point method.
本文提出了一种新的内点二次规划算法，它能以更少的计算量求解电力系统优化问题。该算法具有以下两个特点。首先，该算法基于路径跟随内点算法，其搜索方向为牛顿方向，具有二次收敛性。其次，该算法直接求解一个对称不定系统，避免了[AD/sup -1/ a /sup T/]的形成，与对大型电力系统进行正定系统矩阵分解相比，产生的填充量更少。这大大加快了发展速度。由于内点法的公式推导更为一般，因此该算法既可以从可行点(内点)出发，也可以从不可行的点(非内点)出发。在IEEE测试系统和日本344总线系统上的数值结果表明，该算法具有足够的鲁棒性，与已有报道的内点法相比，求解时间明显缩短。
{"title":"An application of interior point quadratic programming algorithm to power system optimization problems","authors":"Hua Wei, Hiroshi Sasaki, Takeshi Nagata","doi":"10.1109/PICA.1995.515171","DOIUrl":"https://doi.org/10.1109/PICA.1995.515171","url":null,"abstract":"This paper presents a new interior point quadratic programming algorithm which can solve power system optimization problems with significantly less computational efforts. The proposed algorithm has the following two special features. First, it is based on the path-following interior point algorithm whose search direction is the Newton direction, and therefore the algorithm has quadratic convergence. In the second place, it solves directly a symmetric indefinite system and thus the algorithm avoids the formation of [AD/sup -1/A/sup T/] and as a result generates fewer fill-ins than the case of factorizing the positive definite system matrix for large scale power systems. This has brought about a profound speed-up. Since the formulae of the interior point method have been deduced more generally, the proposed algorithm can start from either a feasible (interior point) or an infeasible point (noninterior point). Numerical results on the IEEE test systems and a Japanese 344 bus system have verified that the proposed algorithm possesses enough robustness and needs significantly less solution time compared with already reported applications of the interior point method.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126942641","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 : 1995-05-07DOI: 10.1109/PICA.1995.515197
M. Crow, J.G. Chen
In this paper, the multirate method is applied to the problem of simulating the dynamics of a power system which contains fast components such as induction machine loads and FACTS devices. Results concerning the numerical stability and accuracy of the multirate method are presented. Implementation concerns are also addressed by studying an example power system which contains a wide range of time response behavior.
{"title":"The multirate simulation of FACTS devices in power system dynamics","authors":"M. Crow, J.G. Chen","doi":"10.1109/PICA.1995.515197","DOIUrl":"https://doi.org/10.1109/PICA.1995.515197","url":null,"abstract":"In this paper, the multirate method is applied to the problem of simulating the dynamics of a power system which contains fast components such as induction machine loads and FACTS devices. Results concerning the numerical stability and accuracy of the multirate method are presented. Implementation concerns are also addressed by studying an example power system which contains a wide range of time response behavior.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133487164","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 : 1995-05-07DOI: 10.1109/PICA.1995.515158
Yukitoki Tsukamoto, Isao Iyoda
This paper describes a methodology to allocate the cost of transmission network facilities to wheeling transactions in decentralized power systems. The authors propose that the responsibility placed on transmission facilities involved in each transaction be according to the transmission usage pattern. Their proposal incorporates the MW-mile method and considers economies of scale of transmission network facilities. They also incorporate a nucleolus scheme in the cooperative game theory to deal with matters of conflict. The applicability of their method is demonstrated in a numerical example.
{"title":"Allocation of fixed transmission cost to wheeling transactions by cooperative game theory","authors":"Yukitoki Tsukamoto, Isao Iyoda","doi":"10.1109/PICA.1995.515158","DOIUrl":"https://doi.org/10.1109/PICA.1995.515158","url":null,"abstract":"This paper describes a methodology to allocate the cost of transmission network facilities to wheeling transactions in decentralized power systems. The authors propose that the responsibility placed on transmission facilities involved in each transaction be according to the transmission usage pattern. Their proposal incorporates the MW-mile method and considers economies of scale of transmission network facilities. They also incorporate a nucleolus scheme in the cooperative game theory to deal with matters of conflict. The applicability of their method is demonstrated in a numerical example.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131146934","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 : 1995-05-07DOI: 10.1109/PICA.1995.515192
H. Harsan, N. Hadjsaid, P. Pruvot
Security analysis is an important task in modern power system control centers. Security considerations must allow for both active power problems (thermal limits) and reactive power problems involving nodal voltages (isolation and stability limits). There is a definite need for new methods capable of ensuring that system security limits will not be exceeded when abnormal conditions arise, applicable in the real time environment. In this paper, a general algorithm for automating cyclic security analysis is discussed. The algorithm developed uses data obtained from previous security analysis and filters out nondangerous contingencies with reduced computation time. The proposed method may be used to improve speed-up of existing contingency algorithms. Tests have been performed, on the French 225-400 kV grid containing 462 nodes and 855 branches. For this system 96 real states were analysed over a 24-hour-period in 15-minute-steps, These states were recorded on 19 January 1994 on the French grid. The tests confirm that our approach is both applicable and accurate.
{"title":"An adaptive prefilter algorithm for real-time cyclic security analysis","authors":"H. Harsan, N. Hadjsaid, P. Pruvot","doi":"10.1109/PICA.1995.515192","DOIUrl":"https://doi.org/10.1109/PICA.1995.515192","url":null,"abstract":"Security analysis is an important task in modern power system control centers. Security considerations must allow for both active power problems (thermal limits) and reactive power problems involving nodal voltages (isolation and stability limits). There is a definite need for new methods capable of ensuring that system security limits will not be exceeded when abnormal conditions arise, applicable in the real time environment. In this paper, a general algorithm for automating cyclic security analysis is discussed. The algorithm developed uses data obtained from previous security analysis and filters out nondangerous contingencies with reduced computation time. The proposed method may be used to improve speed-up of existing contingency algorithms. Tests have been performed, on the French 225-400 kV grid containing 462 nodes and 855 branches. For this system 96 real states were analysed over a 24-hour-period in 15-minute-steps, These states were recorded on 19 January 1994 on the French grid. The tests confirm that our approach is both applicable and accurate.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134083349","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 : 1995-05-07DOI: 10.1109/PICA.1995.515163
R. M. Hassan, C. Nwankpa
This paper attempts to justify claims made by the authors concerning the application of a power system stochastic voltage collapse indicator (SVCI). Since the SVCI is an approximate solution to a system of stochastic differential equations, the authors present a scheme to evaluate its validity. The scheme involves the use of Monte-Carlo techniques where for a given confidence interval, samples representing different realizations of the modeled uncertain power system will be run with the goal of obtaining the sampled value of the SVCI. Accuracy and sensitivity of the indicator are compared to benchmark measurements obtained from Monte-Carlo runs of a dynamic power system perturbed by small-magnitude perturbations. Strong correlation between the two sets of values for the SVCI and its sampled counterpart will give credence to the application of the SVCI to voltage stability studies.
{"title":"An interpretation of stochastic voltage collapse indication","authors":"R. M. Hassan, C. Nwankpa","doi":"10.1109/PICA.1995.515163","DOIUrl":"https://doi.org/10.1109/PICA.1995.515163","url":null,"abstract":"This paper attempts to justify claims made by the authors concerning the application of a power system stochastic voltage collapse indicator (SVCI). Since the SVCI is an approximate solution to a system of stochastic differential equations, the authors present a scheme to evaluate its validity. The scheme involves the use of Monte-Carlo techniques where for a given confidence interval, samples representing different realizations of the modeled uncertain power system will be run with the goal of obtaining the sampled value of the SVCI. Accuracy and sensitivity of the indicator are compared to benchmark measurements obtained from Monte-Carlo runs of a dynamic power system perturbed by small-magnitude perturbations. Strong correlation between the two sets of values for the SVCI and its sampled counterpart will give credence to the application of the SVCI to voltage stability studies.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130845545","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 : 1995-05-07DOI: 10.1109/PICA.1995.515193
H. Mori, H. Tanaka, J. Kanno
This paper proposes an efficient method for contingency screening in power systems. Contingency analysis requires substantial amounts of computational time in evaluating data for controlling generating units or power flows. In this paper, the Tchebychev iteration of an indirect method is presented for solving a set of linear equations of fast decoupled power flow (FDPF) in the contingency screening. Furthermore, the precondition technique is introduced to improve the convergence characteristics of the indirect method. The proposed method has been successfully applied to a 2107 node system.
{"title":"A preconditioned fast decoupled power flow method for contingency screening","authors":"H. Mori, H. Tanaka, J. Kanno","doi":"10.1109/PICA.1995.515193","DOIUrl":"https://doi.org/10.1109/PICA.1995.515193","url":null,"abstract":"This paper proposes an efficient method for contingency screening in power systems. Contingency analysis requires substantial amounts of computational time in evaluating data for controlling generating units or power flows. In this paper, the Tchebychev iteration of an indirect method is presented for solving a set of linear equations of fast decoupled power flow (FDPF) in the contingency screening. Furthermore, the precondition technique is introduced to improve the convergence characteristics of the indirect method. The proposed method has been successfully applied to a 2107 node system.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125059459","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 : 1995-05-07DOI: 10.1109/PICA.1995.515180
M. Christoforidis, M. Aganagic, B. Awobamise, S. Tong, A. Rahimi
This paper describes the modeling approach and the solution techniques that were employed in developing the long-term/mid-term resource scheduling (LMRS) function for the power system of Schweizerische Bundesbahnen (Swiss Railways). LMRS together with the annual load forecast and annual maintenance scheduling functions constitute the long-term/mid-term operational planning subsystem of Swiss Railways' new energy management system.
{"title":"Long-term/mid-term resource optimization of a hydro-dominant power system using interior point method","authors":"M. Christoforidis, M. Aganagic, B. Awobamise, S. Tong, A. Rahimi","doi":"10.1109/PICA.1995.515180","DOIUrl":"https://doi.org/10.1109/PICA.1995.515180","url":null,"abstract":"This paper describes the modeling approach and the solution techniques that were employed in developing the long-term/mid-term resource scheduling (LMRS) function for the power system of Schweizerische Bundesbahnen (Swiss Railways). LMRS together with the annual load forecast and annual maintenance scheduling functions constitute the long-term/mid-term operational planning subsystem of Swiss Railways' new energy management system.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114559790","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 : 1995-05-07DOI: 10.1109/PICA.1995.515209
D. Reichelt, E. Ecknauer, H. Glavitsch
In real three-phase power systems, the voltages and currents are not fully symmetrical. A method has been developed to estimate the effects of slight unbalanced network conditions for steady-state operation. A conventional power flow is followed by a linear incremental calculation using a three-phase model of the network. The unbalanced condition is handled like a multiple unbalanced fault. The process is illustrated for the case of a transformer bank with nonidentical single phase units. The results show the effects of different transformer reactances and different voltage ratios, respectively.
{"title":"Estimation of steady-state unbalanced system conditions combining conventional power flow and fault analysis software","authors":"D. Reichelt, E. Ecknauer, H. Glavitsch","doi":"10.1109/PICA.1995.515209","DOIUrl":"https://doi.org/10.1109/PICA.1995.515209","url":null,"abstract":"In real three-phase power systems, the voltages and currents are not fully symmetrical. A method has been developed to estimate the effects of slight unbalanced network conditions for steady-state operation. A conventional power flow is followed by a linear incremental calculation using a three-phase model of the network. The unbalanced condition is handled like a multiple unbalanced fault. The process is illustrated for the case of a transformer bank with nonidentical single phase units. The results show the effects of different transformer reactances and different voltage ratios, respectively.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116941602","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 : 1995-05-07DOI: 10.1109/PICA.1995.515269
I. Slutsker, S. Mokhtari, L.A. Jaques, J. Provost, M.B. Perez, J.B. Sierra, F. González, J.M.M. Figueroa
The paper describes the first implementation of phase angle measurements in an industrial power system state estimator. Transducers for measuring phase angles using satellite clock synchronization were installed at Sevillana de Electricidad and incorporated into the data acquisition subsystem of the EMS. The state estimator was modified to support the processing of phasor telemetry. The enhancements to the state estimator algorithm are described in the paper. The modified state estimator was subjected to intensive testing prior to installation in the field. The results of all experiments as well as classification of phasor measurement effectiveness are reported in the paper. Phasor measurements were found to provide valuable information about the power network and improve the accuracy of the state estimation.
{"title":"Implementation of phasor measurements in state estimator at Sevillana de Electricidad","authors":"I. Slutsker, S. Mokhtari, L.A. Jaques, J. Provost, M.B. Perez, J.B. Sierra, F. González, J.M.M. Figueroa","doi":"10.1109/PICA.1995.515269","DOIUrl":"https://doi.org/10.1109/PICA.1995.515269","url":null,"abstract":"The paper describes the first implementation of phase angle measurements in an industrial power system state estimator. Transducers for measuring phase angles using satellite clock synchronization were installed at Sevillana de Electricidad and incorporated into the data acquisition subsystem of the EMS. The state estimator was modified to support the processing of phasor telemetry. The enhancements to the state estimator algorithm are described in the paper. The modified state estimator was subjected to intensive testing prior to installation in the field. The results of all experiments as well as classification of phasor measurement effectiveness are reported in the paper. Phasor measurements were found to provide valuable information about the power network and improve the accuracy of the state estimation.","PeriodicalId":294493,"journal":{"name":"Proceedings of Power Industry Computer Applications Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132001862","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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