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DC harmonics of HVDC series tapping stations 高压直流串联分接站的直流谐波
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591088
S. Arabi, M. Tarnawecky
{"title":"DC harmonics of HVDC series tapping stations","authors":"S. Arabi, M. Tarnawecky","doi":"10.1109/CEEJ.1987.6591088","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591088","url":null,"abstract":"The DC characteristic harmonics of an HVDC series tapping station are analyzed from three points of view: the generated magnitudes; the magnitudes entering the DC transmission line sections; and reduction of the generated magnitudes by various differential firing algorithms. The theoretical analysis is supported by digital simulation studies of a 10% series tap incorporated in the Bipole II of the Nelson River HVDC system. The application or elimination of DC harmonic filters at the tapping station depends, among other factors, on the lengths of the DC line sections between the tapping and the main converter stations.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130121806","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
Real-time processing of transformer tap positions 实时处理变压器分接位置
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591094
V. Quintana, T. Van Cutsem
{"title":"Real-time processing of transformer tap positions","authors":"V. Quintana, T. Van Cutsem","doi":"10.1109/CEEJ.1987.6591094","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591094","url":null,"abstract":"Reviews the methods for network parameter estimation and correction in power system state estimation and proposes a sequential-type method for real-time processing of transformer tap positions. The method exploits the information contained in the measurement residuals to estimate a better tap position; it uses a linearized sensitivity model to relate the measurement residuals to the tap position error. Based on part of the Belgium HV system, several testing results are reported.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122120886","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: 49
Design of a repulsion motor with digital electronically-controlled commutator 带数字电控换向器的斥力电机设计
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591091
S. Saadate, E. Gudefin, C. Goeldel
{"title":"Design of a repulsion motor with digital electronically-controlled commutator","authors":"S. Saadate, E. Gudefin, C. Goeldel","doi":"10.1109/CEEJ.1987.6591091","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591091","url":null,"abstract":"The repulsion motor with spatially fixed brushes provides, as the series-connected DC motor, a hyperbolical torque-speed characteristic and can be used in electrical traction applications. Variable speed operation is obtained by changing the position of the brushes. The authors present a repulsion motor with a static commutator that substitutes the classical repulsion motor commutator using digital operation through a control-loop. The prototype and the two types of commutator used in this project are explained, and the control-loop and control-process are studied.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125895911","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 formulation of load flow equations in balanced radial distribution systems 平衡型径向配电系统潮流方程的新表述
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591090
A. Chandrasekaran, R. Broadwater
{"title":"A new formulation of load flow equations in balanced radial distribution systems","authors":"A. Chandrasekaran, R. Broadwater","doi":"10.1109/CEEJ.1987.6591090","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591090","url":null,"abstract":"A new formulation of load flow equations in a balanced three-phase distribution system is developed. Voltage magnitudes and real and reactive power losses in the series are chosen as variables, and Newton's method is applied for the solution of the set of equations. Computer implementation of the formulation is presented. The convergence characteristics are found to be good, and results for a representative system are included. Advantages and drawbacks of the algorithm are discussed.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124371795","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
Effects of geomagnetically-induced currents in power transformers from power systems point of view 从电力系统的角度看地磁感应电流对电力变压器的影响
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591093
S. Arabi, M. M. Komaragiri, M. Tarnawecky
{"title":"Effects of geomagnetically-induced currents in power transformers from power systems point of view","authors":"S. Arabi, M. M. Komaragiri, M. Tarnawecky","doi":"10.1109/CEEJ.1987.6591093","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591093","url":null,"abstract":"Geomagnetically-induced currents (GICs), passing through the grounded neutral leads of power transformers, produce simultaneous AC-DC excitations causing some degree of half-cycle transformer saturation which may cause a number of associated problems. A quantitative evaluation of produced harmonics, VAr demand, copper loss, and iron loss of the transformer under GIC is presented. The impact of these effects depends on the ratio of GIC to the critical GIC necessary to cause full transformer saturation. Theoretical results are supported by digital simulation results using the Electro-Magnetic Transients Program (EMTP).","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122929538","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
Static and small signal analysis of a series-resonant converter operating above its resonant frequency 工作在谐振频率以上的串联谐振变换器的静态和小信号分析
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591092
K. Al- Haddad, Y. Chéron, H. Foch, V. Rajagopalan
{"title":"Static and small signal analysis of a series-resonant converter operating above its resonant frequency","authors":"K. Al- Haddad, Y. Chéron, H. Foch, V. Rajagopalan","doi":"10.1109/CEEJ.1987.6591092","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591092","url":null,"abstract":"A study of static and dynamic characteristics of a series-resonant power converter incorporating dual thyristor switches is presented. In a series-resonant converter (SRC), the dual thyristor operates at a frequency above its resonant frequency and this operation is efficiently achieved because of negligible turn-on and turn-off losses even at high frequencies. After reviewing the characteristics of a dual thyristor, the authors plot normalized static characteristics that are useful in designing SRC incorporating dual thyristors. For small signal perturbations, Bode diagrams of the control to output voltage transfer function are obtained by calculation and compared with experimental measurements. The effects of large signal perturbation on the stability of the SRC are also presented.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131586050","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
Error mechanisms in a four-level pulse width modulated optical fibre system 四电平脉宽调制光纤系统中的误差机理
Canadian Electrical Engineering Journal Pub Date : 1987-10-01 DOI: 10.1109/CEEJ.1987.6591089
K. H. Teo, C. G. Englefield, P. Goud
{"title":"Error mechanisms in a four-level pulse width modulated optical fibre system","authors":"K. H. Teo, C. G. Englefield, P. Goud","doi":"10.1109/CEEJ.1987.6591089","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6591089","url":null,"abstract":"The error mechanisms in a four-level PWM optical fibre communication system are investigated. The error mechanisms are related to the noise variance and amplitude of the received signal at the sampling instants. This theory, referred to as the `amplitude theory', is shown to be more generally applicable than an earlier theory, referred to as the `slope theory'. The slope theory is an extension of the noise analysis for an analog PWM system. Theoretical and experimental results show that the slope theory generally underestimates the BER and that the amplitude theory gives a more accurate evaluation.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"356 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123107255","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
Channel hand-off strategies in cellular mobile communication systems 蜂窝移动通信系统中的信道切换策略
Canadian Electrical Engineering Journal Pub Date : 1987-07-01 DOI: 10.1109/CEEJ.1987.6593828
E. Bitar, M. McDonnell, N. Georganas
{"title":"Channel hand-off strategies in cellular mobile communication systems","authors":"E. Bitar, M. McDonnell, N. Georganas","doi":"10.1109/CEEJ.1987.6593828","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6593828","url":null,"abstract":"This paper describes a computer simulation study of a cellular, land-mobile radio communication system with and without frequency hand-off strategies. The authors assume that cell boundary crossings for calls-in-progress exist. In the hand-off procedure, they have studied several strategies where channels are specifically reserved for hand-offs. These strategies have been evaluated in terms of the new-call rejection rate and the rate of premature terminations of calls-in-progress. In a second method the authors have found the additional base station transmitter power required to service all the calls in progress without switching them to new channels. In addition, the cochannel interference introduced by this method has been evaluated and studied as a function of the additional transmission distance, with different partitions of channels, while maintaining a blocking probability of 2% or less.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127699392","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
Beneficial effects of positive current feedback control of DC motors 直流电机正电流反馈控制的有益效果
Canadian Electrical Engineering Journal Pub Date : 1987-07-01 DOI: 10.1109/CEEJ.1987.6593833
A. Turgeon, J. O'Shea
{"title":"Beneficial effects of positive current feedback control of DC motors","authors":"A. Turgeon, J. O'Shea","doi":"10.1109/CEEJ.1987.6593833","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6593833","url":null,"abstract":"The widespread use of DC motors for servomechanisms and robots requires good design expertise of every possible type of control systems. Tachometers and position sensors play a vital role to insure good performances of speed regulators and position followers. This paper shows that the use of an armature current sensor and a positive feedback loop allows for more design freedom when building speed regulators and servomechanisms. Indeed, positive current feedback decreases the transient current peaks and improves precision, especially for speed regulators. The study is based on state space approach and pole placement method. Numerous cases were simulated and results are conclusive.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129128127","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 dual polarized line source feed for cylindrical reflector antennas 用于圆柱形反射器天线的双极化线源馈电
Canadian Electrical Engineering Journal Pub Date : 1987-07-01 DOI: 10.1109/CEEJ.1987.6593829
L. Shafai, A. Ittipiboon, J. Dobrowolski
{"title":"A dual polarized line source feed for cylindrical reflector antennas","authors":"L. Shafai, A. Ittipiboon, J. Dobrowolski","doi":"10.1109/CEEJ.1987.6593829","DOIUrl":"https://doi.org/10.1109/CEEJ.1987.6593829","url":null,"abstract":"A line source feed for an offset cylindrical parabolic reflector antenna is described. The line source consists of two transverse and longitudinal dipole arrays over a ground plane. The elements of each array are fed separately from a feed waveguide through a coaxial line which is connected to a probe inserted into the waveguide. Within each waveguide these probes form a tapered array. The probes are treated as an N-port network to determine their penetration depth for a required Taylor distribution along the line source. The line source is then constructed and tested for both aperture field distribution and the input impedance. Its performance as a feed for an offset cylindrical parabolic reflector antenna is also studied.","PeriodicalId":282137,"journal":{"name":"Canadian Electrical Engineering Journal","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133284711","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
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