Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559021
A. Dmowski, J. Janczak, R. Bugyi
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.558988
G. Heydt
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. >
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559040
M. Kuussaari
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. >
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559003
G. Cokkinides, A. Meliopoulos
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.
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559016
M. Begovic, P. Djurić, S. Dunlap, A. Phadke
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.
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.558991
A. de Oliveira, J. C. de Oliveira, P. Ribeiro
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.
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559029
Dr. Arslan Ahmed Amin, J. E. Steelman, S. Ranade
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.
对HMC台站及类似设备中使用的传统谐波滤波器进行了改进。整流器用于从几个调谐滤波器中回收能量。能量回收量控制滤波质量Q. n r ~ h a M a C。低+滤波器可以在设计时不需要VoftagaSourra双绕组变压器I非线性近负载伴随的功率损耗。从简单性和健壮性的角度来看，这样的方法是可取的。和稳定性。通过对运行特性的仿真研究，阐述了“最小损耗滤波器”的概念及其在现有水电枢纽终端上的应用。
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559094
A. de Oliveira, J. C. de Oliveira, A. Sharaf, T. Ortmeyer, P. Ribeiro
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.
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.559100
A. Di Garlando, I. Viatoli
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
本文介绍了一种电流互感器模型参数的计算方法，该模型用于检测静态变换器产生的单向电流的谐波含量。C。的一面。本文还分析了在原型ct上进行的实验结果。将其与理论模型计算值进行比较。在某些情况下，检测静态变流器产生的单向电流的谐波含量存在相当大的困难，特别是当谐波电流幅值为电流直流分量的10至10 +倍时。在早期的一项研究中，已经开发了一种算法，用于设计在其核心使用气隙的ct。这种装置可以只测量谐波电流。并提出了滤波直流和在测量电路和电力系统之间提供直流隔离的双重优点。同时，它保证了在10+104 Hz的频率范围内可接受的比率误差。在I21中，还描述了在上述整个频率范围内评估比率误差的数学模型的发展。该模型考虑了磁现象(片内涡流和二次漏感)的影响以及寄生电容的影响。本研究考虑了ct模型设计参数的计算问题。特别注意等效寄生电容的计算，得出计算高频工作中主共振频率的简化表达式。本文给出了在适当构造的ct样机上获得的许多测试结果。这些由频率响应曲线(在不同的A。C。和直流电流幅值)，一些波形和曲线的变换的例子，显示了对阶跃输入的瞬态响应。这些结果与数值模拟结果进行了比较，证实了所采用的模型及其参数计算方法的质量。研究结果也为指导和改进设计提供了进一步的信息。用于研究ct操作的集总参数电学模型是众所周知的i型等效电路。给定覆盖的频带宽度(10+104 Hz)。这些参数不能被认为是常数。这尤其适用于派生的分支参数(GO, L o)。它们对涡流的影响很敏感。对于绕组的分布电容。影响高频性能的近似表示是可能的，从而可以计算第一共振频率。731s由一个等效寄生电容C组成，表示整体电容效应，该电容C紧接在理想变压器12,31之后。估计等效寄生电容一种可能的评估准则是基于在单个寄生电容网络中分布的总介电能量与等效电路中属于电容C的能量之间的能量型等效的公式。为此，考虑到匝间电容由于感应电动势和电压降对匝间电压分布没有实质性影响的工作情况，制定了二次绕组中介电能的表达式。这一假设在低频和中频工作中是完全可以接受的，这导致了对总等效电容c的评估。该电容值也被认为是确定第一共振频率的有效值。很明显，这种采用单个电容的表示不允许计算进一步的共振现象，这些现象可以在更高频率的实验中观察到。另一方面，第一共振频率的识别是主要感兴趣的因素，因为它决定了ct可接受的操作范围的上限。基本元素。为相邻匝间单位长度的电容，以此为计算基础。这个参数可以用计算双线上两个平行导体之间电容的表达式来估计。如果“dc”表示金属线的直径，“h”表示导线轴线之间的距离。单位长度C′的电容为:。7 . c。[F/ml]tn(2-h/dc 1)式(l)在距离h较直径dc大时是准确的。然而，作为第一近似，假定它在所研究的情况下也是有效的。此外。 取式(1)中所示的介电常数Lr作为空气介电常数与绝缘体介电常数之间的合适值，该值取决于导线之间的距离h。因此，两个相邻匝之间的电容，根据次级绕组匝的平均长度cm2计算。是:
{"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}
Pub Date : 1992-09-22DOI: 10.1109/ICHPS.1992.558999
S.M. Williams, G. Brownfield, J.W. Duffus
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. >
{"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}
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