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

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A microprocessor based bus relay using a current transformer saturation detector 一种基于微处理器的总线继电器，采用电流互感器饱和检测器
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151372
L. Yang, P.A. Dolloff, A. G. Phadke
{"title":"A microprocessor based bus relay using a current transformer saturation detector","authors":"L. Yang, P.A. Dolloff, A. G. Phadke","doi":"10.1109/NAPS.1990.151372","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151372","url":null,"abstract":"A microprocessor based bus protection scheme is presented. It uses a novel technique to overcome the problem of current transformer saturation. The protection algorithm uses a combination of the percentage differential principles and the phase comparison technique. With a sampling rate of 1440 Hz (24 samples/cycle on a 60 Hz system) a realistic bus is considered for algorithm testing. With the incorporation of this saturation detector, the relay can yield a correct trip/block decision for either an internal or an external fault in the presence of current transformer saturation within one cycle. In the best case, this protection scheme can give a trip/block decision in a quarter cycle. Simulation results show that the saturation detection algorithm and the hybrid bus protection algorithm (using percentage differential and phase comparison principles) are simple, efficient, and accurate.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"2 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":"115519162","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
Transient voltage dip analysis using the transient energy function method 用暂态能量函数法分析暂态电压倾角
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151379
A. Fouad, R. Sreedhara
{"title":"Transient voltage dip analysis using the transient energy function method","authors":"A. Fouad, R. Sreedhara","doi":"10.1109/NAPS.1990.151379","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151379","url":null,"abstract":"It is shown that the transient energy function (TEF) method provides a fast approximate approach to voltage dip computations. The TEF method is used to predict the stability of a power system after a disturbance has occurred. The results of application of the technique to test power systems confirmed that the voltage dips predicted by the TEF method compare well with the values from time domain simulation techniques. An interesting observation is the discrepancy between the two time simulation programs. One of the programs used smaller values of network solution tolerance and solution time step as compared to the other time simulation program. The TEF results showed a consistent pattern of voltage behavior (i.e., the predicted values were lower than the time simulation values). Where there was a discrepancy between the two results, the error was on the conservative or safe side.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"7 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":"114797172","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: 11
Phase-to-ground switching transients in EHV systems 超高压系统的相地切换瞬态
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151373
M. Morcos
{"title":"Phase-to-ground switching transients in EHV systems","authors":"M. Morcos","doi":"10.1109/NAPS.1990.151373","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151373","url":null,"abstract":"The author outlines the effects of unequal pole closure of circuit breakers on the magnitudes of phase-to-ground overvoltages. A model of a short section of a 500 kV line is used. Results show that the mean value of the phase-to-ground voltage increases in both directions away from the zero switching angle where it shows a minimum. The minimum is more distinct in the case of sequential switching than in the simultaneous switching mode. Risk of insulation failure is calculated for both modes of switching. Although the mean values of phase-to-ground overvoltages are less with sequential switching, higher risks of failure are encountered. This is due to the increased scatter in overvoltages indicated by their standard deviation.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"13 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":"122436013","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: 5
An adaptive stabilizer for multimachine power systems 多机电力系统的自适应稳定器
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151353
P. Idowu, A. Ghandakly
{"title":"An adaptive stabilizer for multimachine power systems","authors":"P. Idowu, A. Ghandakly","doi":"10.1109/NAPS.1990.151353","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151353","url":null,"abstract":"An adaptive model-following multimachine power system stabilizer (PSS) design technique is presented. Coordinated control signals are derived at the inputs of each generating unit using only local terminal measurements. A reference model is chosen for each machine to reflect the dynamic interaction between that machine and the rest of the interconnected network. For this purpose an adaptive parameter estimation algorithm is used offline to obtain a linear discrete time dynamic equivalent system for each machine with respect to the rest of the system. This model is used as the basis for defining a coordinated subsystem reference model for each generating unit. The effectiveness of the technique is demonstrated on a multimachine power system using computer simulation studies. Results show improvement in the overall system damping characteristics using the adaptive PSS in comparison to conventional stabilizers.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"84 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":"129558615","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
Design of a robust power system stabilizer over a wide range of load characteristics 大范围负载特性下电力系统稳健性稳定器的设计
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151350
M. Reza, M. A. Choudry
{"title":"Design of a robust power system stabilizer over a wide range of load characteristics","authors":"M. Reza, M. A. Choudry","doi":"10.1109/NAPS.1990.151350","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151350","url":null,"abstract":"The authors present a novel method for designing a power system stabilizer to improve the dynamic stability of AC power systems. the static load is modeled as a nonlinear function of load bus voltage and the dynamic load is modeled by an equivalent induction motor load. The rotor speed and angle deviations of the synchronous generator are used as a stabilizing signal to the power system stabilizer (PSS). The stabilizer gains are selected based on the eigenvalue sensitivity of electromechanical mode of the closed loop system with respect to the load characteristics. Eigenvalue analysis and simulation results show that the proposed PSS improves the system response over a wide range of load characteristics.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"61 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":"116276862","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
Modelling and simulation of the Chukha hydro power plant, Bhutan and the nearby Indian power system 不丹楚卡水电站和附近印度电力系统的建模和仿真
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151394
Y. Wangdi, E. Richards
{"title":"Modelling and simulation of the Chukha hydro power plant, Bhutan and the nearby Indian power system","authors":"Y. Wangdi, E. Richards","doi":"10.1109/NAPS.1990.151394","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151394","url":null,"abstract":"The Chukha power plant in Bhutan consists of four units of 84 MW each of pelton wheel turbines operating under a head of 435 m. It is interconnected with a steam power plant at Farakka, India, consisting of four units of 100 MW each. The objectives of the study are (1) to model and simulate the speed and load changes of the two plants for a small step change of load applied anywhere in the power network and (2) to study the effect of variation of the Chukha governor parameters (within their operating ranges) on these responses. The effect of the Chukha governor parameters on the speed and load changes for a small disturbance in the power network is investigated. The governor and the turbine transfer functions of the power plants are combined together to yield the transfer function of speed devation against load change.<<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":"116658137","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: 2
A comparison of alternative transforms for electric power engineering applications 电力工程应用中可选变换的比较
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151359
K. Olejniczak, G. Heydt
{"title":"A comparison of alternative transforms for electric power engineering applications","authors":"K. Olejniczak, G. Heydt","doi":"10.1109/NAPS.1990.151359","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151359","url":null,"abstract":"It is conjectured that mathematical transform methods may be deserving of increased awareness in systems analysis in general, and power quality calculations in particular, due to their favorable convolution property when studying linear, time-invariant systems. Because certain transforms have associated with them a fast algorithm for digital computation, frequency domain analysis tools can substantially lessen the computational burden when solving for the response to a known system and input. Two elementary examples are included whereby the steady-state system response to nonsinusoidal load currents is calculated using the Hartley and Walsh transforms. A comparison between the fast Fourier transform (FFT) and conventional time domain convolution by lagged products is presented. Also, the authors present a brief introduction to the Mellin transform and its application to Euler linear, time-varying differential equations.<<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":"126866282","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
Load frequency control of an inter-connected system with DC tie-lines and AC-DC parallel tie-lines 具有直流联络线和交直流并联联络线的互联系统负荷频率控制
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151393
S. Bhamidipati, A. Kumar
{"title":"Load frequency control of an inter-connected system with DC tie-lines and AC-DC parallel tie-lines","authors":"S. Bhamidipati, A. Kumar","doi":"10.1109/NAPS.1990.151393","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151393","url":null,"abstract":"The authors examine the effect of DC tie-lines and AC-DC parallel tie-lines in a multi-area interconnected system consisting of hydro and thermal generation units provided with conventional integral controllers. Separate studies were made for each case and results are compared with a pure AC tie-line multi-area system. A conventional integral controller is used for all the studies demonstrated. The DC tie lines and AC-DC parallel tie-lines in an inter-connected power system give much better dynamic performance by bringing all the desired system variables to steady-state faster than in the existing AC tie-line inter-connected systems and quite smoothly. Eigenvalue analysis supports the results.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"51 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":"117156090","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: 12
Thyristor-based damping of turbine-generator shaft torsional oscillations resulting from power system disturbances and subsynchronous resonance-a review 基于晶闸管的电力系统扰动和次同步共振引起的汽轮发电机轴扭振阻尼研究综述
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151355
M. H. Nehrir, M. Donnelly, R. Adapa
{"title":"Thyristor-based damping of turbine-generator shaft torsional oscillations resulting from power system disturbances and subsynchronous resonance-a review","authors":"M. H. Nehrir, M. Donnelly, R. Adapa","doi":"10.1109/NAPS.1990.151355","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151355","url":null,"abstract":"The authors review important publications relevant to the application of thyristor-controlled elements for damping of turbine-generator shaft torsional oscillations resulting from power system disturbances and subsynchronous resonance in the time span of 1980-1990. simulation studies reported in the referenced papers have been done on small power systems like a single generator connected to an infinite bus through one or two parallel lines. Simulation of thyristor-controlled brakes on larger systems is recommended in order to gain better insight into the problem of turbine-generator shaft torsional oscillations resulting from power system disturbances and subsynchronous resonance. Important results and conclusions of the papers are described.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"21 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":"122293132","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: 2
Evaluation of methodologies for shunt VAr planning 分流VAr规划方法评价
Proceedings of the Twenty-Second Annual North American Power Symposium Pub Date : 1990-10-15 DOI: 10.1109/NAPS.1990.151392
J. A. Jatau, J. Momoh, A. Chuku
{"title":"Evaluation of methodologies for shunt VAr planning","authors":"J. A. Jatau, J. Momoh, A. Chuku","doi":"10.1109/NAPS.1990.151392","DOIUrl":"https://doi.org/10.1109/NAPS.1990.151392","url":null,"abstract":"Two methods are developed and evaluated for shunt VAr planning. These methods are capable of sizing and siting shunt VAr at optimum cost and with greater reliability. The methods utilize the generalized Benders decomposition (GBD) technique to decompose the VAr problem into two subproblems. The first level of the problem solves an optimal power flow problem by scheduling control variables including existing VAr sources. The two methods for the second-level discrete allocation process use a branch-and-bound enumeration technique and a mixed-integer linear programming technique. The constraints include security while minimizing the total investment cost. Tests on the IEEE 14-bus system have shown both algorithms to be robust and fast.<<ETX>>","PeriodicalId":330083,"journal":{"name":"Proceedings of the Twenty-Second Annual North American Power Symposium","volume":"5 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":"129907116","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
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