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

{"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":"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}

{"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":"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"title":"AC/DC Harmonic Interaction in HVDC Systems","authors":"K. Sadek, N. Christl, P. Lutzelberger","doi":"10.1109/ICHPS.1992.559036","DOIUrl":"https://doi.org/10.1109/ICHPS.1992.559036","url":null,"abstract":"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.","PeriodicalId":438464,"journal":{"name":"ICHPS V International Conference on Harmonics in Power Systems.","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116839214","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}