Pub Date : 2003-06-09DOI: 10.1109/ISIE.2003.1267972
C. Macià-Sanahuja, H. Lamela-Rivera
The main problem in power transformers is the degradation of the isolation, and partial discharges are a major contribution to this shortcoming. Partial discharges inside medium and high power transformers generate ultrasonic pressure waves which are detected, in this work, with an optical fibre interferometric sensor. The Mach-Zehnder interferometric sensor implemented, for the detection of partial discharges inside power transformers, is described. This sensor allows a high level sensitivity to be achieved for the typical small pressure variations created by partial discharges. Wavelet analysis is used to identify the acoustic patterns instead of more commonly used Fourier analysis. Acoustic signals contain numerous non-stationary or transitory characteristics that Fourier analysis does not allow them to be obtained: when transforming to frequency domain, temporal information disappears. It is possible to state when a particular event took place. The wavelet analysis helps to solve this problem. Some of the results of which are presented here. These results are compared to those obtained with piezoelectric acoustic sensors, when looking for the best wavelet application, showing good agreement between both methods. We have obtained clear signal between 15-17 kHz and, for the first time, wavelet analysis has provided a tool to identify the shape of the acoustic waves associated to partial discharges.
{"title":"Wavelet analysis of partial discharges acoustic waves obtained using an optical fibre interferometric sensor for transformer applications","authors":"C. Macià-Sanahuja, H. Lamela-Rivera","doi":"10.1109/ISIE.2003.1267972","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267972","url":null,"abstract":"The main problem in power transformers is the degradation of the isolation, and partial discharges are a major contribution to this shortcoming. Partial discharges inside medium and high power transformers generate ultrasonic pressure waves which are detected, in this work, with an optical fibre interferometric sensor. The Mach-Zehnder interferometric sensor implemented, for the detection of partial discharges inside power transformers, is described. This sensor allows a high level sensitivity to be achieved for the typical small pressure variations created by partial discharges. Wavelet analysis is used to identify the acoustic patterns instead of more commonly used Fourier analysis. Acoustic signals contain numerous non-stationary or transitory characteristics that Fourier analysis does not allow them to be obtained: when transforming to frequency domain, temporal information disappears. It is possible to state when a particular event took place. The wavelet analysis helps to solve this problem. Some of the results of which are presented here. These results are compared to those obtained with piezoelectric acoustic sensors, when looking for the best wavelet application, showing good agreement between both methods. We have obtained clear signal between 15-17 kHz and, for the first time, wavelet analysis has provided a tool to identify the shape of the acoustic waves associated to partial discharges.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121901620","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267293
C. Machado, J. Mendes, J. Fonseca
Traditionally, automatic cutting-off machines, of metallic pipes or bars, use a constant cutting velocity mode. This mode of operation, constant cutting velocity combined with different profiles of materials to be cut, exposes the cutting saw to variable cutting forces. Therefore, the cutting off machine is usually set for the worst expected conditions, otherwise excessive wear of the saw and machine will occur. Further, traditional cutting-off machines require the adjustment of the position of a limit switch in order to automatically detect when the cut of a piece has been completed. The aim of this paper is to study the application of control algorithms to the process of cutting-off of metallic pipes or bars, with variable profiles implemented in an industrial cutting-off machine, commercially available. The presented algorithm concern real-time cutting control and automatic detection of the cutting end. The algorithms are implemented in a low cost programmable logic controller (PLC), allowing its use in industrial applications without significant increase on machine cost. All algorithms were developed having in mind safety issues relative to the operation of the cutting machine in order to prevent catastrophic failure. Also, all process related relevant parameters are monitored on a personal computer using OPC (object linking and embedding - for process control).
{"title":"Intelligent cutting-off of pipes and bars","authors":"C. Machado, J. Mendes, J. Fonseca","doi":"10.1109/ISIE.2003.1267293","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267293","url":null,"abstract":"Traditionally, automatic cutting-off machines, of metallic pipes or bars, use a constant cutting velocity mode. This mode of operation, constant cutting velocity combined with different profiles of materials to be cut, exposes the cutting saw to variable cutting forces. Therefore, the cutting off machine is usually set for the worst expected conditions, otherwise excessive wear of the saw and machine will occur. Further, traditional cutting-off machines require the adjustment of the position of a limit switch in order to automatically detect when the cut of a piece has been completed. The aim of this paper is to study the application of control algorithms to the process of cutting-off of metallic pipes or bars, with variable profiles implemented in an industrial cutting-off machine, commercially available. The presented algorithm concern real-time cutting control and automatic detection of the cutting end. The algorithms are implemented in a low cost programmable logic controller (PLC), allowing its use in industrial applications without significant increase on machine cost. All algorithms were developed having in mind safety issues relative to the operation of the cutting machine in order to prevent catastrophic failure. Also, all process related relevant parameters are monitored on a personal computer using OPC (object linking and embedding - for process control).","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122470410","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267319
Guangzhi Cao, Jingping Jiang, Jiaqian Chen
Regarding common problems existing in current object tracking algorithms based on image matching, such as large computational cost, long matching time and difficulty to realize in real time, this paper provides an improved algorithm which is able to achieve an accurate and rapid tracking. The new algorithm firstly computes the object prediction position by constructing a novel Kalman predictor, and then an adaptive optimized matching is performed in a neighborhood of this prediction position so as to get the real object position rapidly. The experimental results show this algorithm is tractable and readily realizable. What's more important is that it decreases computational cost significantly but meanwhile shows better performance than traditional correlation-based tracking algorithms.
{"title":"An improved object tracking algorithm based on image correlation","authors":"Guangzhi Cao, Jingping Jiang, Jiaqian Chen","doi":"10.1109/ISIE.2003.1267319","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267319","url":null,"abstract":"Regarding common problems existing in current object tracking algorithms based on image matching, such as large computational cost, long matching time and difficulty to realize in real time, this paper provides an improved algorithm which is able to achieve an accurate and rapid tracking. The new algorithm firstly computes the object prediction position by constructing a novel Kalman predictor, and then an adaptive optimized matching is performed in a neighborhood of this prediction position so as to get the real object position rapidly. The experimental results show this algorithm is tractable and readily realizable. What's more important is that it decreases computational cost significantly but meanwhile shows better performance than traditional correlation-based tracking algorithms.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121771215","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267309
V. Montagner, E. Carati, H. Grundling
This paper presents a discrete-time controller for uninterruptible power supplies applications. The proposed technique is able to guarantee good stability margins and to reduce errors from eventual or periodical disturbances through the combination of a discrete linear quadratic regulator with a repetitive controller. A Kalman filter is used to observe the plant state variables, considering only the measurement of the output voltage. Stability and performance analysis are carried out through simulation and experimental results, illustrating the efficiency of the proposed scheme for uninterruptible power supplies as well as its suitability for AC power sources applications.
{"title":"Design and analysis of a linear quadratic regulator with repetitive controller for AC power supplies","authors":"V. Montagner, E. Carati, H. Grundling","doi":"10.1109/ISIE.2003.1267309","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267309","url":null,"abstract":"This paper presents a discrete-time controller for uninterruptible power supplies applications. The proposed technique is able to guarantee good stability margins and to reduce errors from eventual or periodical disturbances through the combination of a discrete linear quadratic regulator with a repetitive controller. A Kalman filter is used to observe the plant state variables, considering only the measurement of the output voltage. Stability and performance analysis are carried out through simulation and experimental results, illustrating the efficiency of the proposed scheme for uninterruptible power supplies as well as its suitability for AC power sources applications.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"335 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122101474","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267956
H. Dehbonei, C. Nayar, L. Chang
This paper presents a new modular hybrid power system incorporating photovoltaic and small scale wind generators connected to an AC bus. The system is based on voltage source inverters using both current control and voltage control. Preliminary experimental and simulation results are included.
{"title":"A new modular hybrid power system","authors":"H. Dehbonei, C. Nayar, L. Chang","doi":"10.1109/ISIE.2003.1267956","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267956","url":null,"abstract":"This paper presents a new modular hybrid power system incorporating photovoltaic and small scale wind generators connected to an AC bus. The system is based on voltage source inverters using both current control and voltage control. Preliminary experimental and simulation results are included.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130488256","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267986
Filippe S. Hallack, M. R. Petraglia
In this paper, the convergence behaviors of fullband and sub-band LMS algorithms are compared for the acoustic echo canceling application. Post-filtering techniques for the reduction of the residual echo and noise are also described. Experimental results with measured speech signals are presented.
{"title":"Performance comparison of adaptive algorithms applied to acoustic echo cancelling","authors":"Filippe S. Hallack, M. R. Petraglia","doi":"10.1109/ISIE.2003.1267986","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267986","url":null,"abstract":"In this paper, the convergence behaviors of fullband and sub-band LMS algorithms are compared for the acoustic echo canceling application. Post-filtering techniques for the reduction of the residual echo and noise are also described. Experimental results with measured speech signals are presented.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"174 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120922022","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267982
F. Lima, C. Cruz
This paper presents a single-phase rectifier with low conduction losses. To have a further reduction in the rectifier losses, a passive non- dissipative snubber is included in the rectifier. The snubber allows non-dissipative commutation at the switches within a large range of the input current. The snubber reduces the rate of the current grow during the switch turn on and also the rate of voltage grow during the switch turn off. The performance of the snubber circuit associated with the low conduction losses results in a rectifier with high efficiency. The design of a three KW rectifier is also presented and simulation results are shown to access the performance of the proposed rectifier.
{"title":"Unit power factor single-phase rectifier with reduced conduction loss using a non-dissipative passive snubber","authors":"F. Lima, C. Cruz","doi":"10.1109/ISIE.2003.1267982","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267982","url":null,"abstract":"This paper presents a single-phase rectifier with low conduction losses. To have a further reduction in the rectifier losses, a passive non- dissipative snubber is included in the rectifier. The snubber allows non-dissipative commutation at the switches within a large range of the input current. The snubber reduces the rate of the current grow during the switch turn on and also the rate of voltage grow during the switch turn off. The performance of the snubber circuit associated with the low conduction losses results in a rectifier with high efficiency. The design of a three KW rectifier is also presented and simulation results are shown to access the performance of the proposed rectifier.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"577 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123129662","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267251
Guillermo R. Bossio, C. D. de Angelo, J. Solsona, G. García, M. Valla
The application of an additional excitation in induction motor drives for static, dynamic and mixed eccentricity diagnosis is proposed. The additional excitation consists of a predetermined inverter-switching pattern applied while the fundamental excitation is cancelled. This excitation has been previously used to implement a position estimation strategy. This strategy obtains information about the rotor position from the machine saliencies effects over the zero sequence voltage. The air-gap eccentricity is a saliency that depends on the rotor position. For such reason, it also produces changes over the zero sequence voltage. In order to evaluate the feasibility of this proposal, a multiple coupled circuit model of the induction motor is used. Experimental results that validate the proposal are also presented.
{"title":"Application of an additional excitation in inverter-fed induction motors for air-gap eccentricity diagnosis","authors":"Guillermo R. Bossio, C. D. de Angelo, J. Solsona, G. García, M. Valla","doi":"10.1109/ISIE.2003.1267251","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267251","url":null,"abstract":"The application of an additional excitation in induction motor drives for static, dynamic and mixed eccentricity diagnosis is proposed. The additional excitation consists of a predetermined inverter-switching pattern applied while the fundamental excitation is cancelled. This excitation has been previously used to implement a position estimation strategy. This strategy obtains information about the rotor position from the machine saliencies effects over the zero sequence voltage. The air-gap eccentricity is a saliency that depends on the rotor position. For such reason, it also produces changes over the zero sequence voltage. In order to evaluate the feasibility of this proposal, a multiple coupled circuit model of the induction motor is used. Experimental results that validate the proposal are also presented.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129526973","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267902
A. Sabanoviç, O. Sozbilir, G. Goktug, N. Šabanović
In this paper one solution for control of electromechanical linear drive with timing-belt, in the SMC framework is presented. In such a system the elasticity of the timing-belt along with large friction forces represent a major nonlinearity causing wide change of the system parameters and the oscillation of the load. Proposed solution is based on introduction of sliding mode motion and selection of the controller structure based on the predefined structure of the time derivative of Liapunov function candidate. By selecting appropriate form of the Liapunov function time derivative the resulting control is continuous and chattering is minimized. The simulation and experimental results are presented showing that the proposed design can satisfy technical requirements of the system.
{"title":"Sliding mode control of timing-belt servosystem","authors":"A. Sabanoviç, O. Sozbilir, G. Goktug, N. Šabanović","doi":"10.1109/ISIE.2003.1267902","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267902","url":null,"abstract":"In this paper one solution for control of electromechanical linear drive with timing-belt, in the SMC framework is presented. In such a system the elasticity of the timing-belt along with large friction forces represent a major nonlinearity causing wide change of the system parameters and the oscillation of the load. Proposed solution is based on introduction of sliding mode motion and selection of the controller structure based on the predefined structure of the time derivative of Liapunov function candidate. By selecting appropriate form of the Liapunov function time derivative the resulting control is continuous and chattering is minimized. The simulation and experimental results are presented showing that the proposed design can satisfy technical requirements of the system.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"54 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129988928","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 : 2003-06-09DOI: 10.1109/ISIE.2003.1267933
K. Lorentz, A. Kalogeras, T. Bauten, L. Ferrarini, C. Schwab, J. Thieme, G. Fogliazza, A. Vontas
Industrial control technology experiences a strong trend towards distributed systems. This leads to the distribution of formerly physically centralised hardware and software into smaller units, which are distributed within the automation system. From the software point of view, a major state-of-the-art technology for this is the international standard IEC 61499, for which however wide spread applications do not exist. In addition, Internet related technologies also have to be considered, to enhance the overall system performance. Related to these topics diverse proposals created by different organisations exist, which specify a future way of building industrial automation applications. All these approaches have the common modeling paradigm of programming distributed applications by connecting the function blocks in a "system editor". The function blocks for the single distributed units need to be programmed in a specific editor which is device specific. The overall system functionality thus can only be programmed as relationships of already existing function blocks. Within the IST initiative of the European Commission, the funded research project TORERO aims at specifying both an integrated development environment (IDE) and an architectural platform on specific devices which together allow for the distribution of (central) control functions.
{"title":"Next generation integrated development of automation control code in TORERO","authors":"K. Lorentz, A. Kalogeras, T. Bauten, L. Ferrarini, C. Schwab, J. Thieme, G. Fogliazza, A. Vontas","doi":"10.1109/ISIE.2003.1267933","DOIUrl":"https://doi.org/10.1109/ISIE.2003.1267933","url":null,"abstract":"Industrial control technology experiences a strong trend towards distributed systems. This leads to the distribution of formerly physically centralised hardware and software into smaller units, which are distributed within the automation system. From the software point of view, a major state-of-the-art technology for this is the international standard IEC 61499, for which however wide spread applications do not exist. In addition, Internet related technologies also have to be considered, to enhance the overall system performance. Related to these topics diverse proposals created by different organisations exist, which specify a future way of building industrial automation applications. All these approaches have the common modeling paradigm of programming distributed applications by connecting the function blocks in a \"system editor\". The function blocks for the single distributed units need to be programmed in a specific editor which is device specific. The overall system functionality thus can only be programmed as relationships of already existing function blocks. Within the IST initiative of the European Commission, the funded research project TORERO aims at specifying both an integrated development environment (IDE) and an architectural platform on specific devices which together allow for the distribution of (central) control functions.","PeriodicalId":166431,"journal":{"name":"2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133976645","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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