IEEE PES Power Systems Conference and Exposition, 2004.最新文献

{"title":"Construction of representative networks considering investment scenarios based reference network concept","authors":"K. Kawahara, G. Strbac, R. Allan","doi":"10.1109/PSCE.2004.1397627","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397627","url":null,"abstract":"Distribution systems are inherent monopolies and therefore these have generally been regulated in order to protect customers and to ensure cost-effective operation. In the UK this is one of the functions of OFGEM (office of gas and electricity markets). Initially the regulation was based on the value of assets but there is a trend nowadays towards performance-based regulation. In order to achieve this, a methodology is needed that enables the reliability performance associated with alternative investment strategies to be compared with the investment cost of these strategies. At present there is no accepted approach for such assessments. Building on the concept of reference networks proposed in [G. Strbac et al. (2001), V. Levi et al. (2004)] this paper describes how these networks can be used to assess the impact that performance driven investment strategies will have on the improvement in reliability indices. The method has been tested using the underground and overhead part of a real system.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114955696","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}

{"title":"2004 IEEE PES power systems conference & critical requirements for successful on-line security assessment","authors":"K. Morison, L. Wang, P. Kundur, Xi Lin, Wenjian Gao, Chaoyang He, F. Xue, Jianbing Xu, Taishan Xu, Yusheng Xue","doi":"10.1109/PSCE.2004.1397725","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397725","url":null,"abstract":"Ensuring secure operation has always been of paramount importance in the safe and economic operation of power systems. However, the evolution of the electric power industry toward open markets has introduced a number of factors that have heightened the need for more rigorous security assessment and, in many cases, made it much more challenging. Some of these factors include: 1) aging transmission infrastructures/spl rarr/potential component failures; 2) lack of new transmission facilities/spl rarr/bottlenecks; 3) large numbers of small and distributed generators/spl rarr/uncertainty in dispatch patterns; 4) market-driven transactions/spl rarr/unpredictable transactions and system usage; 5) cutbacks in system maintenance/spl rarr/potential for failures such as flashovers to trees; 6) dependence on communications and computer systems/spl rarr/software/hardware failures may leave operators blind; 7) neglect of integrated system planning/spl rarr/insufficient/improper generation/transmission resources; 8) trend toward interconnection/spl rarr/exposure to cascading disturbances. These factors have (a) lead to greater uncertainty in day-today system operations, (b) increased the number of potential sources for system disturbances and (c) increased exposure to phenomena such as voltage instability and inter-area oscillations. As a result, in many power systems, it has become impossible to operate systems with an acceptable degree of security by using traditional operational planning studies that are conducted off-line and use forecast conditions to predict system security limits. This has been illustrated by the major system disturbances that have recently occurred in different systems around the world; highlighting the importance of being able to monitor and ensure system security. Therefore, the use of on-line security assessment is quickly becoming a necessity. This paper presents an overview of the critical components required for on-line security assessment and provides a description of an actual implementation of an on-line security assessment system.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114979212","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}

{"title":"A modified harmonic current vector method for harmonic contribution determination","authors":"B. Blazic, T. Pfajfar","doi":"10.1109/PSCE.2004.1397605","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397605","url":null,"abstract":"This paper deals with the determination of customer contributions to harmonic distortion at the point of connection to the utility network. The approach proposed in this paper is derived from the common power factor practice where a load should be fully compensated at the fundamental frequency and therefore seen as resistive from the network. This principle can be expanded to the whole frequency spectrum claiming the load to be resistive at all harmonic frequencies. The presented solution is based on the harmonic current vectors method where resistance is introduced as the customer reference impedance. The resistance value is calculated from measurements data. The presented method allows calculation of customer side harmonic sources without knowing the actual impedances; it enables the evaluation of unsuitable impedances, e.g. resonance conditions causing the amplification of harmonics.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117231362","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}

{"title":"Grid connected variable speed wind turbine modeling, dynamic performance and control","authors":"A. Haniotis, K. Soutis, A. Kladas, J. Tegopoulos","doi":"10.1109/PSCE.2004.1397569","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397569","url":null,"abstract":"In this paper the electrical part of a grid connected variable speed wind turbine is considered, equipped with a permanent magnet synchronous generator. The modeling of the generator and power converter, ensuring the connection to the grid, are checked experimentally on a prototype, both for dynamic system analysis and operating limits investigation. Measurements as well as control functions are performed by using a microprocessor. The simulation and experimental results are used in the development of a 25 kW wind turbine, in the frame of a research project.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116818722","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}

{"title":"Physical modeling of electric machines for motor drive system simulation","authors":"O. Mohammed, S. Liu, Z. Liu","doi":"10.1109/PSCE.2004.1397716","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397716","url":null,"abstract":"This paper discusses the issues related to the physical modeling of electric machines. The concept of physical modeling is introduced through reviewing the assumptions made in ideal models. In addition to the FE models, a physical phase variable model is proposed. The inductances as well as flux linkages are calculated from nonlinear transient FE solutions. Simulink implementations of both FE model and the phase variable model are studied. A PM synchronous motor and a PM brushless motor are used as objects of this research. The physical models of them are built and applied to various motor drive simulation systems. The obtained results show the ability of physical modeling in obtaining accurate results at much more faster speed.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"2002 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125753293","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}

{"title":"The value of large regional transmission organizations","authors":"K. Kelly","doi":"10.1109/PSCE.2004.1397597","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397597","url":null,"abstract":"This panel discussion deals with an important institutional change in the electric transmission area, the development of regional transmission organizations, or RTOs in most regions. The panel discussion will first set out the need for RTOs, then report the status of RTO formation in the United States, and conclude with a summary of the most important current issues related to RTO formation.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124888971","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}

{"title":"Decision tree based oscillatory stability assessment for large interconnected power systems","authors":"S. P. Teeuwsen, I. Erlich, M. El-Sharkawi","doi":"10.1109/PSCE.2004.1397559","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397559","url":null,"abstract":"This paper deals with a new method for eigenvalue prediction of critical stability modes of power systems based on decision trees. Special interest is focused on inter-area oscillations of large-scale interconnected power systems. The existing methods for eigenvalue computations are time-consuming and require the entire system model that includes an extensive number of states. However, using decision trees, the oscillatory stability can be predicted based on a few selected inputs. Hereby, the outputs of the tree are assigned to the damping ratio of the critical inter-area eigenvalues. Decision trees are fast, easy to train and provide high accuracy for eigenvalue prediction.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129415847","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}

{"title":"Transmission expansion planning in the Western interconnection-the planning process and the analytical tools that will be needed to do the job","authors":"G. Drayton, M. McCoy, M. Pereira, E. Cazalet, M. Johannis, D. Phillips","doi":"10.1109/PSCE.2004.1397595","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397595","url":null,"abstract":"Within the Western interconnection there is a growing realization that the traditional long-term planning processes and analytical methods used to evaluate wires and nonwires alternatives fail to address many of the questions arising from deregulation and the perceived need for new infrastructure to facilitate markets and to assure reliability. In addition, homeland security issues may influence transmission infrastructure expansion. This paper describes the region's evolving transmission expansion planning process and the role OPF' modeling plays in aiding decision-making and consensus building. It identifies some opportunities for improvement in modeling, highlights two state-of-the-art models with capabilities that go beyond those of other models currently used for long-term transmission planning and makes a case for why we need to invest in better modeling and databases.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128344773","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}

{"title":"Preliminary case studies on common information exchanges for power system management","authors":"Y. Serizawa, S. Satoh, T. Tanaka, A. Oikawa, K. Miyazaki, A. Izena","doi":"10.1109/PSCE.2004.1397614","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397614","url":null,"abstract":"This paper discusses the applicability of common information exchanges based on IEC standards as well as conventional and state-of-the-art methodologies for power system management, and clarifies necessary improvements for the information exchange process as case studies. A SCADA and telecontrol system require an integrated information model with device, system configuration and information exchange model components. A special protection system can easily determine power system stability or system separation by utilizing an abridged substation model as topology information. Remote operation and maintenance of protective relays can be also simplified by employing standardized information exchanges.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128189417","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}

{"title":"Harmonic frequency estimation of power systems","authors":"J. Wu, B.T. He, Y. Hu, D. Luo, Y. Liang","doi":"10.1109/PSCE.2004.1397487","DOIUrl":"https://doi.org/10.1109/PSCE.2004.1397487","url":null,"abstract":"This paper presents a hybrid technique for harmonic frequency estimation of nonsinusoidal signals of power systems with high order harmonics using central numerical differentiation and digital FIR filter algorithm. A digital low-pass FIR filter is used to obtain the discrete values of the fundamental sinusoidal component, and a set of digital band-pass FIR filter is applied to compute the discrete values of the harmonic component. Using 6 points numerical differentiation, these discrete values are used for fundamental and harmonic frequency estimation. For a signal with 20 harmonics, the technique requires at most 2 cycles (40 ms) for the first time of estimation computation, and requires at most 1 cycle for the latter estimation. Comparing with other existing techniques, the proposed algorithm is characteristic of high accuracy and much less time. With satisfactory results, a study example is given to illustrate the proposed algorithm in Matlab.","PeriodicalId":308184,"journal":{"name":"IEEE PES Power Systems Conference and Exposition, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128692001","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}