ICHPS V International Conference on Harmonics in Power Systems.最新文献

{"title":"Considerations For Compensation By Active Power Filters","authors":"A. Dmowski, J. Janczak, R. Bugyi","doi":"10.1109/ICHPS.1992.559021","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559021","url":null,"abstract":"","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129291858","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":"Systems Analysis Using Hartley Impedances","authors":"G. Heydt","doi":"10.1109/ICHPS.1992.558988","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.558988","url":null,"abstract":"The Fourier-based method of phasors is reformulated as an all-real calculation method which is based on the Hartley transform. In that transform, the all-real kernel cas (vt) is used rather than the familiar e/sup -jvt/ which is used in the Fourier transform. The concept of an all-real Hartley impedance is developed. The advantages and disadvantages of this alternate formulation are discussed. The method is applied to the calculation of harmonics in electric power distribution systems. >","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124401241","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":"Statistical Evaluation Of Telephone Noise Interference Caused By AC Power Line Harmonic Currents","authors":"M. Kuussaari","doi":"10.1109/ICHPS.1992.559040","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559040","url":null,"abstract":"A statistical approach is used to evaluate the limits for harmonic currents in AC power lines, the goal being to prevent excessive telephone noise interference voltages in subscriber cables in rural areas. The analysis is based on a Monte Carlo simulation which takes into account the effect of the experimental probability distributions of the relevant parameters. It is shown that under Finnish conditions, the properties of communication cables permit equivalent disturbing phase currents of 8 to 10 A. The digital exchanges permit approximately the same currents. Some new telephone types that have a low balance may make it necessary to limit the currents to a level that is somewhat lower. >","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122498894","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 Sequence Impedance of Multiphase Underground Cables","authors":"G. Cokkinides, A. Meliopoulos","doi":"10.1109/ICHPS.1992.559003","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559003","url":null,"abstract":"This paper presents a new model of multiphase underground cables for the mrnputation of harmonic impedana. The unique features of this model indude explicit representation of the grounding configuration and terminal; substation grounds, and the distribution earth currents. A segmentation method is employcd to compute the cable and earth current distribution. Other properties of the model arc: (1) aaura te frequency dependent parameter representation from DC to several MHz, (2) explicit modeling of asymmetries, and (3) high numerical efficiency. The model implementation is based on direct solution of the transmission line differential equations.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115181019","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":"Frequency Tracking In Power Networks Of Harmonics","authors":"M. Begovic, P. Djurić, S. Dunlap, A. Phadke","doi":"10.1109/ICHPS.1992.559016","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559016","url":null,"abstract":"Three new techniques for frequency measurement are prw posed in the paper. The first is a modified zero aoshing method using curve fitting of voltage samplar. The second method is based on polynomial fitting of the DFT quasistationary phasor data for calculation of the rate of change of the positive sequence phase angle. The third method o p erateh on a complex signal obtained by the standard kchnique of quadrature demodulation. All three methods AX characterized by immunity to reasonable unounts of noise m d harmonics in power systems. The performance of the proposed techniques is illustrated on several scenarios by computer simulation.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127042323","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":"Developments In Instrumentation For Harmonic Distortion Monitoring And Measurement","authors":"A. de Oliveira, J. C. de Oliveira, P. Ribeiro","doi":"10.1109/ICHPS.1992.558991","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.558991","url":null,"abstract":"This article presents the results of the developments of compact low cost instrumentation to identify, and evaluate harmonic distortions in electrical power systems. First a sensor of the total voltage or current harmonic distortion is described. This provides the first information on the state of the power quality. The fundamentals and prototype performance results of a harmonic flow direction detector is also discussed. Next a selective harmonic analyzer is described. Finally, an instrument for harmonic impedance measurements is discussed. Adequacy, portability, the use of simplified techniques, reliability, accuracy and low costs of the prototypes are discussed in this paper.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132128164","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":"Innovative Filter Concept For Power System Harmonics","authors":"Dr. Arslan Ahmed Amin, J. E. Steelman, S. Ranade","doi":"10.1109/ICHPS.1992.559029","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559029","url":null,"abstract":"A modification to conventional harmonic filters used in HMC Stations and similar equipment is proposed. A rectifier is used to recover energy from several tuned filters. and the amount of energy recovered controls filter quality Q. n r ~ h a M a C Thus. low+ filters can be desimed without the VoftagaSourra Two-Winding Transformer I Nonllnear Load attendant power losses. Such f i l t e rs are desirable from the point of view of simplicity, robustness. and stability. The 'minimum losses filter' concept is explained through simulation studies of operating characteristics and Its application to an existing HYDC terminal.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130117255","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 Standards - The Need For An Integrated Perspective","authors":"A. de Oliveira, J. C. de Oliveira, A. Sharaf, T. Ortmeyer, P. Ribeiro","doi":"10.1109/ICHPS.1992.559094","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559094","url":null,"abstract":"Four conditions are necessary for the establishment of an effective harmonic standard. First, it must be comprehensive in that it adequately takes account of the complexity and dynamics of harmonic phenomena. Secondly, it must be flexible enough to accommodate varying conditions and different networks. Thirdly, it must be effective in guaranteeing the compliance with specified compatibility conditions necessary for proper operation of the system (equipment and loads). Finally, it must be simple, such that the operating engineer is able to understand and apply it whenever necessary. With these issues in mind, this paper presents a qualitative analysis of the existing standards €or harmonic distortion by pointing to their limitations and their conflicting philosophical bases while emphasizing the need for an integrated approach that explicitly and comprehensively considers the complexity and dynamics of the harmonic problem. An oveniew of existing standards is followed by a description of fundamental/philosophical issues that need consideration and integration in the preparation of harmonics standards. Practical measurement problems and planning system considerations are raised and discussed. Some basic guidelines are presented.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129425144","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":"D.C. Polarized Current Transformers For The Measurement Of Harmonic Noise: Numerical and Experimental Analysis","authors":"A. Di Garlando, I. Viatoli","doi":"10.1109/ICHPS.1992.559100","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559100","url":null,"abstract":"The paper describes the method employed for calculating the parameters of the model of a current transformer (C.T.) designed to detect the harmonic content of unidirectional currents generated by static convertors on their D . C . side. The paper also analyses the experimental results obtained during tests carried out on a prototype C.T.. comparing them with the values calculated from the theoretical model. I M R O D U f l I ON The detection of the harmonic content of unidirectional currents generated by static convertors presents considerable difficulties in certain cases, particularly whet the harmonic current amplitudes are of the order of 10to lo-+ times the D.C. component of the current. During an earlier study 121 an algorithm has been developed for the design of a C.T. employing an air gap in its core. This device makes possible the measurement of harmonic currents only. and presents the double advantage of filtering out the D.C. and providing D.C. isolation between the measuring circuit and the power system. At the same time, it assures an acceptable ratio error over the frequency range 10+104 Hz. In I21 it is also described the development of a mathematical model for the evaluation of the ratio error over the entire frequency range mentioned. This model takes into account the influence of magnetic phenomena (eddy currents in laminations and secondary leakage inductance) as well as the effect of parasitic capacitances. The present study considers the problem of calculating the design parameters of the C.T. model. Particular attention is given to the calculation of the equivalent parasitic capacitance, arriving at the determination of a simplified expression for calculating the main resonance frequency in high-frequency operation. The paper shows many test results, obtained on a suitably constructed C.T. prototype. These consist of frequency response curves (at different A . C . and D.C. current amplitudes), examples of transformation of some waveforms and curves showing the transient response to a step input. These results, compared with those obtained by numerical simulation, confirm the quality of the model adopted and of the method used for calculating its parameters. The results also yield further informations i n guiding and improving the design. CALCULATION PARAKtXERS The lumped-parameter electrical model adopted for the study of the C.T. operation is the well-known I-type equivalent circuit. Given the width of the band covered (10+104 Hz). the parameters cannot be considered as constant. Ihis applies particularly to the derived branch parameters (GO, L o ) . which are sensitive to the influence of eddy currents. As for the distributed capacitances of the windings. which affect the performance at high frequencies, an approximate representation 1s possible, enabling the calculation of the first resonance frequency. 731s consists o f representing the overall capacitance effect by means of a single equivalent parasitic capacitance C, p","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122521195","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 Propagation On An Electric Distribution System: Fleld Measurements Compared With Computer Simulation","authors":"S.M. Williams, G. Brownfield, J.W. Duffus","doi":"10.1109/ICHPS.1992.558999","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.558999","url":null,"abstract":"Increasing use of power electronic loads on distribution feeders together with greater use of power factor correction capacitors on the distribution system can result in poor operating conditions in the form of high harmonic levels propagating through a distribution system. HARMFLO (Harmonic Power Flow Study Program) was developed by EPRI (Electric Power Research Institute) for use in the analysis of harmonics on a power system. However, for a typical analysis of a distribution system, data for some of the parameters required by HARMFLO are not available. Furthermore, exact load information is usually not available. Harmonic levels determined from field tests on a distribution system are compared to results of HARMFLO simulations to determine if this analysis tool can provide useful results despite the lack of exact information for load modeling and other system parameters. >","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114965983","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}