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.1992.559031
J. Janczak, A. Emanuel
will be free of harmonic pollution and the compensator performs like an active filter. If in addition t o (3) the compensator can conx’ert active power, i.e., ic.l jL 0, in which case we deal with a n Active Power Line Conditioner [31. In many instances the compensator delivers or absorbs 60 Hz reactive current, i,, # 0, such tha t the line current i is nearly in phase with the fundamental component of the voltage, or can be made purposely to lag or lead the voltage. These concepts are implemented by monitoring the currents i ~ ~ j and ixr, and adjusting the compensator current waveform and magnitude such tha t i , ~ = -ih” and ;,I = i N , l . Recent studies [4,5,6,7] point out that in low and medium voltage systems with many small or medium sized nonlinear loads scattered among the network busses it is not feasible to compensate separately each nonlinear load. At the busses where a harmonic compensator is available it is more beneficial to use the compensator for the minimization of voltage distortion in the system. This s t r a t e g is the logical one, since in such systems i t is possible to monitor bus voltages but practically impossible to monitor the currents of a miriade of small linear loads. The distortion a t a certain bus with the voltage
{"title":"Adaptive Control Algorithm For Harmonic Compensators","authors":"J. Janczak, A. Emanuel","doi":"10.1109/ICHPS.1992.559031","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559031","url":null,"abstract":"will be free of harmonic pollution and the compensator performs like an active filter. If in addition t o (3) the compensator can conx’ert active power, i.e., ic.l jL 0, in which case we deal with a n Active Power Line Conditioner [31. In many instances the compensator delivers or absorbs 60 Hz reactive current, i,, # 0, such tha t the line current i is nearly in phase with the fundamental component of the voltage, or can be made purposely to lag or lead the voltage. These concepts are implemented by monitoring the currents i ~ ~ j and ixr, and adjusting the compensator current waveform and magnitude such tha t i , ~ = -ih” and ;,I = i N , l . Recent studies [4,5,6,7] point out that in low and medium voltage systems with many small or medium sized nonlinear loads scattered among the network busses it is not feasible to compensate separately each nonlinear load. At the busses where a harmonic compensator is available it is more beneficial to use the compensator for the minimization of voltage distortion in the system. This s t r a t e g is the logical one, since in such systems i t is possible to monitor bus voltages but practically impossible to monitor the currents of a miriade of small linear loads. The distortion a t a certain bus with the voltage","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"8 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":"130299134","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.1992.559004
U. De Martinis, C. Fusco, F. Gagliardi, D. Lauria, D. Villacci
{"title":"On The Evaluation Of The Harmonic Impedances In AC/DC Systems","authors":"U. De Martinis, C. Fusco, F. Gagliardi, D. Lauria, D. Villacci","doi":"10.1109/ICHPS.1992.559004","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559004","url":null,"abstract":"","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":"124033199","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.1992.558998
Rao, Thallam, Scnior Mcmbcr, Salt River Projcct, W. Grady
The increasing application of power electronics in residential, commercial, and industrial loads is gradually increasing current and voltage distortion levels in distribution systems. This trend will accelerate il large loads such as air conditioners are. in the future, powered by electronic drive systems. The objective of this paper is to present the results of a simulation case study in which feeder distortion levels are predicted as adjustable-speeddrive (ASD) air Conditioners become an appreciable fraction of the total load.
{"title":"Estimating Future Harmonic Distortion Levels In Distribution Systems Due To Single-Phase Adjustable-Speed-Drive Air Conditioners: A Case Study","authors":"Rao, Thallam, Scnior Mcmbcr, Salt River Projcct, W. Grady","doi":"10.1109/ICHPS.1992.558998","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.558998","url":null,"abstract":"The increasing application of power electronics in residential, commercial, and industrial loads is gradually increasing current and voltage distortion levels in distribution systems. This trend will accelerate il large loads such as air conditioners are. in the future, powered by electronic drive systems. The objective of this paper is to present the results of a simulation case study in which feeder distortion levels are predicted as adjustable-speeddrive (ASD) air Conditioners become an appreciable fraction of the total load.","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":"121040870","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.1992.558992
H. Beides, Fan Zhang, A. P. Sakis Meliopoulos
Accurate harmonic power flow studies rrquirr calculation of the steady state periodic solution for the network components rrprcsented in the studies. For components with switching sequence controls this task may be complex and computationally demanding. This paper presents a new and efficient method for computing the periodic steady state solution for components used in harmonic analysis. The method is based on state space representation of the components and optimal control theory. Results obtained from testing the method on a single-phase AC controller are prsented.
{"title":"A New Modeling Approach For Power System Harmonic Analysis","authors":"H. Beides, Fan Zhang, A. P. Sakis Meliopoulos","doi":"10.1109/ICHPS.1992.558992","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.558992","url":null,"abstract":"Accurate harmonic power flow studies rrquirr calculation of the steady state periodic solution for the network components rrprcsented in the studies. For components with switching sequence controls this task may be complex and computationally demanding. This paper presents a new and efficient method for computing the periodic steady state solution for components used in harmonic analysis. The method is based on state space representation of the components and optimal control theory. Results obtained from testing the method on a single-phase AC controller are prsented.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"27 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":"133970905","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.1992.559009
M. Depenbrock
A generally applicable method to analyse the relations connecting currents, voltages, instantaneous-, active-, nonactive- and apparent power quantities is described. By introducing a special m-conductor equivalent scheme an unified treatment of nonsinusoidaI, unbalanced polyphase systems is possible and a simple definition of unsymmetrical loads can be derived. It is explained why it is necessary to distinguish between the decomposition of quantities into components or into portions. The method includes other ones well known and approved in the past as more special cases
{"title":"The FBD-Method, A Generally Applicable Tool For Analyzing Power Relations","authors":"M. Depenbrock","doi":"10.1109/ICHPS.1992.559009","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559009","url":null,"abstract":"A generally applicable method to analyse the relations connecting currents, voltages, instantaneous-, active-, nonactive- and apparent power quantities is described. By introducing a special m-conductor equivalent scheme an unified treatment of nonsinusoidaI, unbalanced polyphase systems is possible and a simple definition of unsymmetrical loads can be derived. It is explained why it is necessary to distinguish between the decomposition of quantities into components or into portions. The method includes other ones well known and approved in the past as more special cases","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"45 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":"124025775","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.1992.559002
A. Girgis, W. Quaintance, J. Qiu, E. Makram
A time-domain method for impedance modeling of an unbalanced, three-phase power transmission and distribution network using three-phase measurements of bus voltage and injected current waveforms is presented. An impedance model seen at a bus where a harmonic filter is to be installed is calculated for each harmonic frequency, and the effect of placing the filter at the bus is then analyzed at these frequencies. As the configuration or operating condition of the power system varies, the estimated model changes accordingly, provided updated measurements are available. Hence, the effect of the harmonic filter under different system configurations or operating conditions is analyzed, and the information from this analysis is used for online harmonic filter control. Impedance models estimated by the proposed method are applied in filter design and performance analysis with actual recorded data, and the results are presented. >
{"title":"A Time-domain Three-phase Power System Impedance Modeling Approach For Harmonic Filter Analysis","authors":"A. Girgis, W. Quaintance, J. Qiu, E. Makram","doi":"10.1109/ICHPS.1992.559002","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559002","url":null,"abstract":"A time-domain method for impedance modeling of an unbalanced, three-phase power transmission and distribution network using three-phase measurements of bus voltage and injected current waveforms is presented. An impedance model seen at a bus where a harmonic filter is to be installed is calculated for each harmonic frequency, and the effect of placing the filter at the bus is then analyzed at these frequencies. As the configuration or operating condition of the power system varies, the estimated model changes accordingly, provided updated measurements are available. Hence, the effect of the harmonic filter under different system configurations or operating conditions is analyzed, and the information from this analysis is used for online harmonic filter control. Impedance models estimated by the proposed method are applied in filter design and performance analysis with actual recorded data, and the results are presented. >","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"37 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":"123287663","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.1992.559006
M. Grotzbach, Jianping Xu
{"title":"Investigation Of Noncharacteristic Harmonics In AC/DC Converters Caused By Network Asymmetries","authors":"M. Grotzbach, Jianping Xu","doi":"10.1109/ICHPS.1992.559006","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559006","url":null,"abstract":"","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"22 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":"129338249","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 : 1900-01-01DOI: 10.1109/ICHPS.1992.559036
K. Sadek, N. Christl, P. Lutzelberger
The harmonic interaction between AC- and DC-systems has been discussed in various publications with respect to both charactcristic and non-characteristic harmonic phenomenon injected into ac-power transmission systems by HVDC converters. However, in recent convener stations different magnitudes of harmonic currents than the theoretical predicted values have been measured. This paper describes a mathematical circuit analysis to determine the transfer of harmonics from the supplying ac-grid to the receiving ac-system and vice versa connected by HVDC links. In general there are mathematical rules, which type and magnitude of harmonics (dependent on the positive or negative sequence system components) will be transferred through the dc-circuit and injected into the receiving power grid. A mathematical model is represented to describe the transfer of harmonics (harmonic voltage distortion from the sending ac-system) through the HVDC link and its impact on the receiving ac-side. The contribution of these harmonic voltages has been analyzed and will be considered for modelling the harmonic current source for the inverter terminal. The model is valid for power flow in both directions.
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