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Proceedings of the Twenty-Second Annual North American Power Symposium最新文献

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Computational enhancements to the power system state estimator at harmonic frequencies 谐波频率下电力系统状态估计器的计算改进
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151354
M. Najjar, G. Heydt
{"title":"Computational enhancements to the power system state estimator at harmonic frequencies","authors":"M. Najjar, G. Heydt","doi":"10.1109/NAPS.1990.151354","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151354","url":null,"abstract":"A study on the application of estimation theory to predict harmonic bus voltages and line currents which cannot or are not measured directly is proposed. The methodology is based on measurements, state estimators, and harmonic system modeling. A hybrid of quadratic and nonquadratic criterion-based techniques utilizing singular value decomposition is used with a feasible application to large-scale problems. Contrary to the fundamental case, the Jacobian matrix of the power system equations at harmonic frequencies is shown to be ill-conditioned. A robust numerical technique, using linear transformations to scale the Jacobian matrix, is suggested to render the estimation problem solvable in a practical environment.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129485432","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}
引用次数: 0
A digital fault location technique for loop transmission systems using three-phase data 一种利用三相数据的环路传输系统数字故障定位技术
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151370
A. Girgis, C. Fallon
{"title":"A digital fault location technique for loop transmission systems using three-phase data","authors":"A. Girgis, C. Fallon","doi":"10.1109/NAPS.1990.151370","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151370","url":null,"abstract":"The authors present a digital fault location technique using digital fault recorded data for a 115 kV loop transmission system. This technique is based on the use of three phase quantities. The goal of this study is to determine the accuracy of this method and to determine the effects of the different sources of error. Some of the sources of error considered are: the effect of load models; the effect of neglecting loads; the effects of line capacitance; and the effects of untransposition. The method is first tested using steady state fault analysis data, then using simulated transient data generated by using an electromagnetic transient program (EMTP), and finally on actual recorded data. To give a better understanding of this technique, the theory behind it is briefly discussed. The results of test cases determining the accuracy of this technique are presented.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129885036","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}
引用次数: 1
A systematic sensitivity approach for optimal reactive power planning 无功最优规划的系统灵敏度方法
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151381
W. Refaey, A. Ghandakly, M. Azzoz, I. Khalifa, Omar H. Abdalla
{"title":"A systematic sensitivity approach for optimal reactive power planning","authors":"W. Refaey, A. Ghandakly, M. Azzoz, I. Khalifa, Omar H. Abdalla","doi":"10.1109/NAPS.1990.151381","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151381","url":null,"abstract":"A systematic procedure is developed to locate and minimize the number of reactive power devices in power systems based on a set of indices and the sensitivity matrix. A definition of the bus voltage performance index (VPI) is proposed for optimal reactive power planning. It is equal to the root mean square value of the corresponding column of the sensitivity matrix. The VPIs in previous work depend on the norms which can be defined in nonunique ways. In the proposed technique, the three indices are given different weights depending on their values. The load buses are also ordered on the basis of their values depending on the total weights at each bus for the three indices. This ordering of load buses as well as the sensitivity matrix is then used to determine the optimal location and number of reactive power devices required in the system.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121364212","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}
引用次数: 8
Modified fast-decoupled state estimation in rectangular-coordinates (for power systems) 矩形坐标系下改进的快速解耦状态估计(用于电力系统)
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151361
I. O. Habiballa, V. Quintana
{"title":"Modified fast-decoupled state estimation in rectangular-coordinates (for power systems)","authors":"I. O. Habiballa, V. Quintana","doi":"10.1109/NAPS.1990.151361","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151361","url":null,"abstract":"The authors present a modified fast-decoupled estimation technique in rectangular coordinates to obtain a fast solution of the power system state estimator. This improvement is achieved by introducing further approximations in calculating the Jacobian matrix. The proposed decoupling technique reduces the amount of computational time and computer memory required to obtain the optimal solution. The performance analysis of this technique is evaluated using the IEEE 30-bus system. The proposed rectangular decoupling technique is compared with the standard technique in the polar coordinates, the actual polar decoupling technique and the polar fast-decoupled technique.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124346005","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}
引用次数: 6
Three-dimensional magnetic field calculation computer program for 60 Hz substations 60hz变电站三维磁场计算计算机程序
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151374
W. Zhang, D. Kasten, G. Addis
{"title":"Three-dimensional magnetic field calculation computer program for 60 Hz substations","authors":"W. Zhang, D. Kasten, G. Addis","doi":"10.1109/NAPS.1990.151374","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151374","url":null,"abstract":"The computer program described is used to predict the three-dimensional magnetic flux density in and around 60 Hz substations. The program assumes that the station is air insulated, thereby neglecting the effect of any surrounding magnetic materials. The program is written in Fortran 77. There is a version of the program for a DEC VAX 11/785 and a version for an IBM or compatible PC. A simplified logic diagram of the program is shown. There are two types of data files required by the program: coordinate files and current files. Their functions are described. Comparison of calculated results with data obtained from a reduced scale model shows very good correlation.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127996564","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}
引用次数: 0
Building the basis for user interactive computing in slow transient and dynamic power system studies 为慢暂态和动态电力系统研究中的用户交互计算奠定基础
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151351
C. Hatziadoniu, M. Daneshdoost
{"title":"Building the basis for user interactive computing in slow transient and dynamic power system studies","authors":"C. Hatziadoniu, M. Daneshdoost","doi":"10.1109/NAPS.1990.151351","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151351","url":null,"abstract":"The authors address the problem of slow transient and dynamic simulation of power systems on personal computers. An approach is presented for the systematic description and organization of the information and data pertaining to these studies, such as control system configuration and parameters, output selection, simulation scenario description, etc., in order to provide the basis for user interactive analysis programs. The techniques, applied to the EMTDC program, result in an autonomous executable module that permits the user to conduct the simulation studies completely through input data files. This development eliminates the need for coding, compilation, and linking and constitutes the necessary step towards creating user interactive software on personal computers for power system studies. The final product includes the modified EMTDC main module and is linked with the EMTDC libraries MAIN, UTIL, VALG, and SVG plus additional subroutines to facilitate the simulation description process.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132047002","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}
引用次数: 0
A new estimate of a heater/air conditioner duty cycle based on the maximum likelihood theory 基于最大似然理论的加热器/空调占空比估算新方法
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151365
A. Noureddine, A. Alouani
{"title":"A new estimate of a heater/air conditioner duty cycle based on the maximum likelihood theory","authors":"A. Noureddine, A. Alouani","doi":"10.1109/NAPS.1990.151365","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151365","url":null,"abstract":"The objective is to derive a duty cycle of a heater/air conditioner unit that correctly accounts for the effects of the driving process noise. The unit is modeled by using a stochastic hybrid state model driven by a white Gaussian process. Using the Kolmogorov backward equation, first passage theory, and the theory of maximum likelihood-estimation, a duty cycle is derived that shows the effects of the noise term that models the random influences introduced by the environment/customer. The derived duty cycle accounts explicitly for the statistics of the driving process. The proposed method leads to a more accurate estimate of the duty cycle. Existing duty cycles are derived as a special case of this approach.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131311864","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}
引用次数: 3
Design and development of a line voltage detector 线路电压检测仪的设计与研制
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151367
S. Rowan, J. Staab, R. Shultz, M. Muslu
{"title":"Design and development of a line voltage detector","authors":"S. Rowan, J. Staab, R. Shultz, M. Muslu","doi":"10.1109/NAPS.1990.151367","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151367","url":null,"abstract":"A voltage detector to determine whether a line is energized or not was designed and developed into a prototype. A voltage proportional to the line-to-neutral voltage is filtered through a third order bandpass filter, to obtain the triggering signal for the detector. The prototype was tested in the laboratory using a 1.5 kVA, 120/7200 V, single phase distribution transformer. the low voltage side of the transformer is connected through an autotransformer to a 120 V source. This gives a voltage magnitude of between 0 and 7.2 kV (RMS), depending on the input voltage. The detector is attached to one of the output terminals of the transformer and the neutral wire is attached to the other terminal of the transformer simulating line to neutral voltage. A light bulb is used to simulate the sunlight that is needed to power the circuit. The development of this line detecting circuit is discussed.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114685238","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}
引用次数: 1
Effects of under-load tap changer (LTC) on power system voltage stability 欠载分接开关对电力系统电压稳定性的影响
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151383
J. Momoh, Y. Zhang, G. J. Young
{"title":"Effects of under-load tap changer (LTC) on power system voltage stability","authors":"J. Momoh, Y. Zhang, G. J. Young","doi":"10.1109/NAPS.1990.151383","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151383","url":null,"abstract":"The effect of load tap changer (LTC) action on a transformer's adjusted side voltage (usually the secondary side of step-down transformers) is evaluated when the tap position on LTC is raised (lowered) to increase (decrease) the adjusted side voltage. The effects of other measures such as series and shunt compensation and their combination with LTCs are also evaluated. A static representation model of a power system model on a large populated industrial center such as the Puget Sound area of Bonneville Power Administration and the Boston area of New England Power Service are evaluated. The characterization of reactive power voltage (Q-V) relation and real power voltage (P-V) relation curves during a voltage degradation process is studied. The results and experience gained from system specific applications are enumerated.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116952460","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}
引用次数: 1
Harmonics in variable speed fan systems 变速风扇系统中的谐波
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151357
A. El-Koubysi, M. Morcos, A. Heber, J. Li
{"title":"Harmonics in variable speed fan systems","authors":"A. El-Koubysi, M. Morcos, A. Heber, J. Li","doi":"10.1109/NAPS.1990.151357","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151357","url":null,"abstract":"The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30 degrees pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133623333","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}
引用次数: 0
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