Pub Date : 2002-12-10DOI: 10.1109/LESCPE.2002.1020687
Z.Q. Wang, S.Z. Zhou, Y.J. Guo
Power quality disturbances are normally recorded by dedicated PQ monitors as sampled points in time. Magnitude is accepted as a significant detection and general classification index in field devices or later assessment analysis. Suitable methods of magnitude characterization are one of the bases of PQD measuring and monitoring. The magnitude of PQD can be determined in several different ways. The RMS voltage, peak voltage and fundamental voltage component are introduced to quantify the voltage severity levels in number of published standards. The paper presents the algorithms of the mentioned approaches implemented in Matlab for quasi real-time situation. The algorithms are FFT-based and/or wavelet transform based. They are validated with the example of the radial test system field voltage sag waveforms provided by the IEEE. The depth-duration characterization of voltage sags is illustrated with the mentioned different approaches. The most appropriate approach is suggested at the end of the paper according to the practical monitoring or measuring requirements. We develop a new PQ monitor with DSP chip infrastructure where all the methods are applied. The proper window length selection and technique to avoid oscillation is also discussed in the rest of the paper. The descriptive information obtained from the magnitude characterization can be used further to extract features for PQD detection and classification.
{"title":"Comparisons on ways of magnitude characterization of power quality disturbances","authors":"Z.Q. Wang, S.Z. Zhou, Y.J. Guo","doi":"10.1109/LESCPE.2002.1020687","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020687","url":null,"abstract":"Power quality disturbances are normally recorded by dedicated PQ monitors as sampled points in time. Magnitude is accepted as a significant detection and general classification index in field devices or later assessment analysis. Suitable methods of magnitude characterization are one of the bases of PQD measuring and monitoring. The magnitude of PQD can be determined in several different ways. The RMS voltage, peak voltage and fundamental voltage component are introduced to quantify the voltage severity levels in number of published standards. The paper presents the algorithms of the mentioned approaches implemented in Matlab for quasi real-time situation. The algorithms are FFT-based and/or wavelet transform based. They are validated with the example of the radial test system field voltage sag waveforms provided by the IEEE. The depth-duration characterization of voltage sags is illustrated with the mentioned different approaches. The most appropriate approach is suggested at the end of the paper according to the practical monitoring or measuring requirements. We develop a new PQ monitor with DSP chip infrastructure where all the methods are applied. The proper window length selection and technique to avoid oscillation is also discussed in the rest of the paper. The descriptive information obtained from the magnitude characterization can be used further to extract features for PQD detection and classification.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122049543","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020667
M. Skok, D. Skrlec, S. Krajcar
In order to enhance the serviceability in the distribution system genetic algorithm and GIS based method is proposed in this article for planning the link distribution networks. All practical issues such as cost parameters (investments, line losses, maintenance), and technical constraints (voltage drop, thermal limit, reliability) as well as physical routing constraints (obstacles, high cost passages, existing line sections) are taken into consideration. Fuzzy set concept and scenario representation (tree of futures) to model uncertainties, as well as decision making guided by a paradigm of multi-criteria risk analysis are discussed. The merits of the approach are discussed by analyzing its application to a study case based on a real case in a Croatian utility.
{"title":"Genetic algorithm and GIS enhanced long term planning of large link structured distribution systems","authors":"M. Skok, D. Skrlec, S. Krajcar","doi":"10.1109/LESCPE.2002.1020667","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020667","url":null,"abstract":"In order to enhance the serviceability in the distribution system genetic algorithm and GIS based method is proposed in this article for planning the link distribution networks. All practical issues such as cost parameters (investments, line losses, maintenance), and technical constraints (voltage drop, thermal limit, reliability) as well as physical routing constraints (obstacles, high cost passages, existing line sections) are taken into consideration. Fuzzy set concept and scenario representation (tree of futures) to model uncertainties, as well as decision making guided by a paradigm of multi-criteria risk analysis are discussed. The merits of the approach are discussed by analyzing its application to a study case based on a real case in a Croatian utility.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124858748","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020669
M. A. Abdel Aziz, E.E. Abou Elzahab, A. Ibrahim, A. Zobaa
Optimization criteria are presented which allow proper calculation of optimal power factor. Optimization minimizes the line loss, maximizes the power factor and maximizes the efficiency, taking into consideration the skin effect. The performance of the obtained capacitor is discussed by means of a numerical example.
{"title":"Skin effect on optimal power factor","authors":"M. A. Abdel Aziz, E.E. Abou Elzahab, A. Ibrahim, A. Zobaa","doi":"10.1109/LESCPE.2002.1020669","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020669","url":null,"abstract":"Optimization criteria are presented which allow proper calculation of optimal power factor. Optimization minimizes the line loss, maximizes the power factor and maximizes the efficiency, taking into consideration the skin effect. The performance of the obtained capacitor is discussed by means of a numerical example.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116480478","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020670
H. Kojabadi, L. Chang, R. Doriaswami
This paper reports the basic concept and recent progress in sensorless vector-controlled inverter fed induction tor (IM) drives. In field oriented control, a rotational transducer such as a tachometer, an encoder or a resolver, was often mounted on the IM shaft. However, a speed sensor cannot be mounted on a shaft in some cases such as motor drives in a hostile environment or high-speed motor drives. Further, these sensors suffer from low reliability, high cost and noise. Therefore, a sensorless speed drive is increasingly employed in modern industrial applications. This paper gives a short review of sensorless vector control of an induction motor drive.
{"title":"Recent progress in sensorless vector-controlled induction motor drives","authors":"H. Kojabadi, L. Chang, R. Doriaswami","doi":"10.1109/LESCPE.2002.1020670","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020670","url":null,"abstract":"This paper reports the basic concept and recent progress in sensorless vector-controlled inverter fed induction tor (IM) drives. In field oriented control, a rotational transducer such as a tachometer, an encoder or a resolver, was often mounted on the IM shaft. However, a speed sensor cannot be mounted on a shaft in some cases such as motor drives in a hostile environment or high-speed motor drives. Further, these sensors suffer from low reliability, high cost and noise. Therefore, a sensorless speed drive is increasingly employed in modern industrial applications. This paper gives a short review of sensorless vector control of an induction motor drive.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125515464","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020674
S. Nabavi-Niaki
This paper investigates the ability of unified power flow controller (UPFC) on controlling the tie line power transfer of an interconnected system. A form of vector presentation in complex power plane is used to visualize the effect of different control parameters of UPFC on tie line power transfer. This visualization helps to identify the effectiveness of each control parameters on power control region.
{"title":"Visualization of UPFC control parameters effects on the tie-line power flow","authors":"S. Nabavi-Niaki","doi":"10.1109/LESCPE.2002.1020674","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020674","url":null,"abstract":"This paper investigates the ability of unified power flow controller (UPFC) on controlling the tie line power transfer of an interconnected system. A form of vector presentation in complex power plane is used to visualize the effect of different control parameters of UPFC on tie line power transfer. This visualization helps to identify the effectiveness of each control parameters on power control region.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122154140","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020677
L. Aromataris, G. Rodríguez, S. Preidikman
One of the most important problems in the study of transient stability of power systems is the determination of perturbation's maximum time of permanence without losing the synchronism of the generators that feed the network. The problem is generally solved by either the application of the equal-area criterion or through numerical integration methods. In the present work, the phase-plane is proposed as an alternative tool to solve the above-mentioned problem with greater efficiency.
{"title":"The phase plane: a tool to solve the transient stability problem","authors":"L. Aromataris, G. Rodríguez, S. Preidikman","doi":"10.1109/LESCPE.2002.1020677","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020677","url":null,"abstract":"One of the most important problems in the study of transient stability of power systems is the determination of perturbation's maximum time of permanence without losing the synchronism of the generators that feed the network. The problem is generally solved by either the application of the equal-area criterion or through numerical integration methods. In the present work, the phase-plane is proposed as an alternative tool to solve the above-mentioned problem with greater efficiency.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124923522","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020676
A.S. Quintela, C. Castro
In this paper, a method for contingency ranking for voltage stability is proposed. Contingencies are ranked according to a performance index defined in terms of branch-based voltage stability proximity indices. Simulation results show that the most critical contingencies can be correctly identified.
{"title":"Improved branch-based voltage stability proximity indices. II. Application in security analysis","authors":"A.S. Quintela, C. Castro","doi":"10.1109/LESCPE.2002.1020676","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020676","url":null,"abstract":"In this paper, a method for contingency ranking for voltage stability is proposed. Contingencies are ranked according to a performance index defined in terms of branch-based voltage stability proximity indices. Simulation results show that the most critical contingencies can be correctly identified.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123034342","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 : 2002-12-10DOI: 10.1109/LESCPE.2002.1020684
M. Shwehdi, A. Mantawy, J. Bakhashwain, Y. El Hawi
Nowadays, the concern about power quality is continuously increasing, due to industry automation and use of nonlinear devices introduced in the power system. These nonlinear control devices or loads may cause harmonics or distortion to the current waveform. Such distortions will cause malfunction to the sensitive devices such as metering instruments, on-line process analyzers, and measuring devices, and false readings may be displayed. These false readings are going to affect the operation of the plant and may cause shut down and large monetary losses. The purpose of this paper is to outline the subject of harmonics and to conduct and demonstrate harmonic study on a petrochemical company power system in Saudi Arabia. The study will insure that the harmonic flows between different buses are within standards for industrial plants, and emphasize that the plant can be safely operated from the harmonics effects point of view. Also, to determine the THD values, and conduct mitigation if high THD, TIF values obtained to that are beyond the recommended practices by IEEE-519-1992.
{"title":"Harmonic flow study and evaluation of a petrochemical plant in Saudi Arabia","authors":"M. Shwehdi, A. Mantawy, J. Bakhashwain, Y. El Hawi","doi":"10.1109/LESCPE.2002.1020684","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020684","url":null,"abstract":"Nowadays, the concern about power quality is continuously increasing, due to industry automation and use of nonlinear devices introduced in the power system. These nonlinear control devices or loads may cause harmonics or distortion to the current waveform. Such distortions will cause malfunction to the sensitive devices such as metering instruments, on-line process analyzers, and measuring devices, and false readings may be displayed. These false readings are going to affect the operation of the plant and may cause shut down and large monetary losses. The purpose of this paper is to outline the subject of harmonics and to conduct and demonstrate harmonic study on a petrochemical company power system in Saudi Arabia. The study will insure that the harmonic flows between different buses are within standards for industrial plants, and emphasize that the plant can be safely operated from the harmonics effects point of view. Also, to determine the THD values, and conduct mitigation if high THD, TIF values obtained to that are beyond the recommended practices by IEEE-519-1992.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128996548","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 : 2002-10-28DOI: 10.1109/LESCPE.2002.1020686
M. A. Abdel Aziz, E.E. Abou Elzahab, A. Ibrahim, A. Zobaa
The effect of capacitance compensation of nonlinear loads is considered on the displacement factor, distortion factor, and power factor. Optimization of the displacement factor is found to result in reduction of the distortion factor to a minimum value.
{"title":"Effect of terminal capacitance on the supply current distortion factor","authors":"M. A. Abdel Aziz, E.E. Abou Elzahab, A. Ibrahim, A. Zobaa","doi":"10.1109/LESCPE.2002.1020686","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020686","url":null,"abstract":"The effect of capacitance compensation of nonlinear loads is considered on the displacement factor, distortion factor, and power factor. Optimization of the displacement factor is found to result in reduction of the distortion factor to a minimum value.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134430740","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/LESCPE.2002.1020657
The following topics are dealt with: power system economics; power system deregulation; distribution systems; power electronics; power system stability; power system protection; power system fault analysis; and power quality.
{"title":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","authors":"","doi":"10.1109/LESCPE.2002.1020657","DOIUrl":"https://doi.org/10.1109/LESCPE.2002.1020657","url":null,"abstract":"The following topics are dealt with: power system economics; power system deregulation; distribution systems; power electronics; power system stability; power system protection; power system fault analysis; and power quality.","PeriodicalId":127699,"journal":{"name":"LESCOPE'02. 2002 Large Engineering Systems Conference on Power Engineering. Conference Proceedings","volume":"41 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":"123670144","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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