Pub Date : 1900-01-01DOI: 10.1109/ISIE.2002.1025975
E. Chiarantoni, G. Fornarelli, S. Vergura
This article describes a technique for the formulation of the constraint equations in electrical networks containing ideal switches and characterized by, a time variant topology. The proposed method is suitable for semi-qualitative analysis of switching circuits (switch with zero RON and infinite ROFF) where a faster simulation is preferred to a precise one to focus only the behavioral performance of the circuit to analyze. In the proposed approach a set of overall constraint equations, the "Template Equations," are written at the start of the simulation. The constraint equations, for each topological configuration produced by the ON/OFF switches, are derived by TE on the basis of simple operations. The advantage of the proposed approach consist into the capability to represent, in a single set of equations, circuits with time variant topology.
{"title":"A topological approach to the analysis of switching circuits","authors":"E. Chiarantoni, G. Fornarelli, S. Vergura","doi":"10.1109/ISIE.2002.1025975","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1025975","url":null,"abstract":"This article describes a technique for the formulation of the constraint equations in electrical networks containing ideal switches and characterized by, a time variant topology. The proposed method is suitable for semi-qualitative analysis of switching circuits (switch with zero RON and infinite ROFF) where a faster simulation is preferred to a precise one to focus only the behavioral performance of the circuit to analyze. In the proposed approach a set of overall constraint equations, the \"Template Equations,\" are written at the start of the simulation. The constraint equations, for each topological configuration produced by the ON/OFF switches, are derived by TE on the basis of simple operations. The advantage of the proposed approach consist into the capability to represent, in a single set of equations, circuits with time variant topology.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"14 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":"125386971","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/ISIE.2002.1026367
S. Bolognani, M. Zigliotto
This paper proposes a novel systematic approach to the analysis and design of three-phase current controllers based on the space vector theory. Balanced load currents are considered so that the control is performed by two loops only. According to the proposed space-vector methodology, the two control loops are examined together, as if they were a single system. Well known controllers are reviewed in the frame of the new approach, and new controllers are envisaged. The advantages and pitfalls of each scheme are easily recognised and discussed.
{"title":"A space-vector approach to the analysis and design of three-phase current controllers","authors":"S. Bolognani, M. Zigliotto","doi":"10.1109/ISIE.2002.1026367","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1026367","url":null,"abstract":"This paper proposes a novel systematic approach to the analysis and design of three-phase current controllers based on the space vector theory. Balanced load currents are considered so that the control is performed by two loops only. According to the proposed space-vector methodology, the two control loops are examined together, as if they were a single system. Well known controllers are reviewed in the frame of the new approach, and new controllers are envisaged. The advantages and pitfalls of each scheme are easily recognised and discussed.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"47 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":"126124890","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/ISIE.2002.1025938
V. Oleschuk, F. Blaabjerg, B. Bose
A novel method of direct synchronous pulsewidth modulation (PWM) is applied to control of modular multilevel converters consisting of three standard triphase inverter modules along with an 0.33 p.u. output transformer. The proposed method provides synchronisation of the voltage waveforms for each module and the composed voltage at the output of the converter. Multilevel output voltage of the converter has quarter-wave symmetry during the whole range including the zone of overmodulation. Both continuous and discontinuous versions of synchronous PWM, based on vector approach for determination of the pulse patterns, have been analysed and compared using simulations of the systems with low switching frequencies, which normally are used in high power systems.
{"title":"Synchronous control of modular multilevel converters","authors":"V. Oleschuk, F. Blaabjerg, B. Bose","doi":"10.1109/ISIE.2002.1025938","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1025938","url":null,"abstract":"A novel method of direct synchronous pulsewidth modulation (PWM) is applied to control of modular multilevel converters consisting of three standard triphase inverter modules along with an 0.33 p.u. output transformer. The proposed method provides synchronisation of the voltage waveforms for each module and the composed voltage at the output of the converter. Multilevel output voltage of the converter has quarter-wave symmetry during the whole range including the zone of overmodulation. Both continuous and discontinuous versions of synchronous PWM, based on vector approach for determination of the pulse patterns, have been analysed and compared using simulations of the systems with low switching frequencies, which normally are used in high power systems.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"18 3 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":"126038399","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/ISIE.2002.1026072
T. Kokubu, Noriki Uchida, M. Oku, K. Kamiyama
In the factory automation (FA) area of the manufacturing industry, maintenance management for improving the operational efficiency of equipment is very important. The production line, which is highly automated and is operated by a small number of staff, is very sensitive to unexpected troubles. If there is little information about the troubles, diagnosis and repair of equipment will take time and production efficiency will fall as a result. A programmable controller (PC) is adopted as machine control of a production line in many manufacturing industries. Generally the ladder diagram, which imitates the electric circuit, is used for the PC program. If equipment is highly automated, the volume of a ladder diagram increases, and it becomes complicated and it is impossible to maintain. This paper proposes automatic diagnosis (AD) for PC, which supports maintenance powerfully at the time of equipment failure. The AD features a simple and standard expression, it can be applied to any PCs, has been independent of an application program, and is not influenced by program change. The authors found out many advantages compared with the conventional troubleshooting, as a result of applying AD to actual equipment.
{"title":"Automatic diagnosis on sequential machine control","authors":"T. Kokubu, Noriki Uchida, M. Oku, K. Kamiyama","doi":"10.1109/ISIE.2002.1026072","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1026072","url":null,"abstract":"In the factory automation (FA) area of the manufacturing industry, maintenance management for improving the operational efficiency of equipment is very important. The production line, which is highly automated and is operated by a small number of staff, is very sensitive to unexpected troubles. If there is little information about the troubles, diagnosis and repair of equipment will take time and production efficiency will fall as a result. A programmable controller (PC) is adopted as machine control of a production line in many manufacturing industries. Generally the ladder diagram, which imitates the electric circuit, is used for the PC program. If equipment is highly automated, the volume of a ladder diagram increases, and it becomes complicated and it is impossible to maintain. This paper proposes automatic diagnosis (AD) for PC, which supports maintenance powerfully at the time of equipment failure. The AD features a simple and standard expression, it can be applied to any PCs, has been independent of an application program, and is not influenced by program change. The authors found out many advantages compared with the conventional troubleshooting, as a result of applying AD to actual equipment.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"58 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":"128375617","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/ISIE.2002.1026319
T. Iino, H. Nakayama
Detailed construction of a full absolute encoder consisting of an absolute angle sensor using a diffused light optical system and a revolution counter using magnetic bubble device was discussed. Using this optical system, a high resolution (1/2020 of revolution) compact angle sensor was realized. Real time data output was also realized by using a digital signal processor. The feature of backup battery free revolution counting was brought out using precision compact magnetic circuits and electrical circuits.
{"title":"A full absolute encoder realized with a high-resolution optical angle sensor and a revolution counter using a magnetic bubble device","authors":"T. Iino, H. Nakayama","doi":"10.1109/ISIE.2002.1026319","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1026319","url":null,"abstract":"Detailed construction of a full absolute encoder consisting of an absolute angle sensor using a diffused light optical system and a revolution counter using magnetic bubble device was discussed. Using this optical system, a high resolution (1/2020 of revolution) compact angle sensor was realized. Real time data output was also realized by using a digital signal processor. The feature of backup battery free revolution counting was brought out using precision compact magnetic circuits and electrical circuits.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"1 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":"128559676","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/ISIE.2002.1025971
R. Faranda, I. Valadè
After showing how the UPQC is able to-compensate for network voltage variations through different operating strategies, one such strategy is proposed whose aim is to limit the total losses of the device. An estimate was made of the extent of the losses of converters as a function of the DC section voltage and of the maximum injectable voltage from the injection transformer and, subsequently, with reference to a specific case, the optimal values for the design of the device are defined. A procedure is proposed, based on simulation of the behaviour of converters, in order to calculate the operating losses of inverters controlled in accordance with the two different PWM techniques used in controlling valves of the device in question.
{"title":"UPQC compensation strategy and design aimed at reducing losses","authors":"R. Faranda, I. Valadè","doi":"10.1109/ISIE.2002.1025971","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1025971","url":null,"abstract":"After showing how the UPQC is able to-compensate for network voltage variations through different operating strategies, one such strategy is proposed whose aim is to limit the total losses of the device. An estimate was made of the extent of the losses of converters as a function of the DC section voltage and of the maximum injectable voltage from the injection transformer and, subsequently, with reference to a specific case, the optimal values for the design of the device are defined. A procedure is proposed, based on simulation of the behaviour of converters, in order to calculate the operating losses of inverters controlled in accordance with the two different PWM techniques used in controlling valves of the device in question.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"33 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":"128647190","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/ISIE.2002.1025956
G. Spagnuolo, M. Vitelli
An evolutionary approach to worst-case circuit tolerance design is presented in this paper. Thanks to an appropriate choice of the fitness function and of the reproduction operators, the algorithm is able to explore a wide sub-region of the space of parameters without any prior knowledge about position and size of the region of acceptability. Vertex analysis has been used to check the feasibility of any candidate tolerance region. For this reason, if, as for a large part of cases, the region of acceptability is convex and simply connected, the algorithm ensures an optimal design with 100% yield. The search for a "central" design in the feasible region,. namely for a set of parameters' central values and tolerances that make the circuit the most tolerant to uncertainties, is driven by the optimization of the objective function of interest for the designer as, for example, the per-unit circuit cost. Features and limitations of the approach are discussed by means of two examples.
{"title":"Worst-case tolerance design by genetic algorithms","authors":"G. Spagnuolo, M. Vitelli","doi":"10.1109/ISIE.2002.1025956","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1025956","url":null,"abstract":"An evolutionary approach to worst-case circuit tolerance design is presented in this paper. Thanks to an appropriate choice of the fitness function and of the reproduction operators, the algorithm is able to explore a wide sub-region of the space of parameters without any prior knowledge about position and size of the region of acceptability. Vertex analysis has been used to check the feasibility of any candidate tolerance region. For this reason, if, as for a large part of cases, the region of acceptability is convex and simply connected, the algorithm ensures an optimal design with 100% yield. The search for a \"central\" design in the feasible region,. namely for a set of parameters' central values and tolerances that make the circuit the most tolerant to uncertainties, is driven by the optimization of the objective function of interest for the designer as, for example, the per-unit circuit cost. Features and limitations of the approach are discussed by means of two examples.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"22 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":"121184801","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/ISIE.2002.1025937
B. Francois, J. Hautier
This paper gives a solution to implement a reconfigurable embedded controller for a NPC inverter. Redundancies in semiconductor configurations are used to enable a minimal operation with faulty power switches. The fault tolerance is obtained by the use of a particular control system architecture where modulated voltages are directly imposed and corresponding switch configurations are determined by a connection controller. In case of failure events, the technique consists in a reconfiguration of the conversion controller.
{"title":"Design of a fault tolerant control system for a NPC multilevel inverter","authors":"B. Francois, J. Hautier","doi":"10.1109/ISIE.2002.1025937","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1025937","url":null,"abstract":"This paper gives a solution to implement a reconfigurable embedded controller for a NPC inverter. Redundancies in semiconductor configurations are used to enable a minimal operation with faulty power switches. The fault tolerance is obtained by the use of a particular control system architecture where modulated voltages are directly imposed and corresponding switch configurations are determined by a connection controller. In case of failure events, the technique consists in a reconfiguration of the conversion controller.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"1 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":"126672347","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/ISIE.2002.1026080
C. Hintz, B. Angerer, D. Schroder
In this paper, the authors present an online identification method for mechatronic systems consisting of a linear part with unknown parameters and a nonlinear system part with unknown static nonlinear characteristics (systems with isolated nonlinearities). A structured recurrent neural network is used to identify the unknown parameters of the known signal flow chart. In this paper, the authors present the successful identification of a typical motion control environment consisting of a driving machine connected by an elastic shaft to the load. The presented identification algorithm uses only the speed of the driving machine for parameter adaption. Besides the detailed steps to develop the structured recurrent network, the authors present simulation results as well as measurement results. The identified linear parameters are the inertias of the driving machine and the load, the spring and damping constant of the elastic shaft. Identification results for the nonlinear friction characteristics are also derived. The novelty of this approach is the simultaneous identification of the parameters of the linear part and the nonlinearity. Due to the use of this approach physical interpretation of the identification results is possible. It is possible to use the identification results in order to optimize nonlinear observers and state space controllers.
{"title":"Online identification of a mechatronic system with structured recurrent neural networks","authors":"C. Hintz, B. Angerer, D. Schroder","doi":"10.1109/ISIE.2002.1026080","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1026080","url":null,"abstract":"In this paper, the authors present an online identification method for mechatronic systems consisting of a linear part with unknown parameters and a nonlinear system part with unknown static nonlinear characteristics (systems with isolated nonlinearities). A structured recurrent neural network is used to identify the unknown parameters of the known signal flow chart. In this paper, the authors present the successful identification of a typical motion control environment consisting of a driving machine connected by an elastic shaft to the load. The presented identification algorithm uses only the speed of the driving machine for parameter adaption. Besides the detailed steps to develop the structured recurrent network, the authors present simulation results as well as measurement results. The identified linear parameters are the inertias of the driving machine and the load, the spring and damping constant of the elastic shaft. Identification results for the nonlinear friction characteristics are also derived. The novelty of this approach is the simultaneous identification of the parameters of the linear part and the nonlinearity. Due to the use of this approach physical interpretation of the identification results is possible. It is possible to use the identification results in order to optimize nonlinear observers and state space controllers.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"37 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":"124032607","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/ISIE.2002.1026361
R. Marino, P. Tomei, C. M. Verrelli
The problem of controlling a sensorless induction motor (i.e. without rotor speed measurements) is addressed. Smooth reference signals for rotor speed and rotor flux modulus are required to be tracked globally (i.e. from any initial condition). Only semiglobal solutions have been obtained, in the literature for the full-order model of an induction motor: a global solution is presented here, by extending the global solution obtained by R. Marino et al. (see 15th IFAC World Congress, Barcelona, July 2002) for current-fed motors. A novel rotor speed observer is designed, while online integration of stator flux dynamics is required.
{"title":"A new global control scheme for sensorless induction motors","authors":"R. Marino, P. Tomei, C. M. Verrelli","doi":"10.1109/ISIE.2002.1026361","DOIUrl":"https://doi.org/10.1109/ISIE.2002.1026361","url":null,"abstract":"The problem of controlling a sensorless induction motor (i.e. without rotor speed measurements) is addressed. Smooth reference signals for rotor speed and rotor flux modulus are required to be tracked globally (i.e. from any initial condition). Only semiglobal solutions have been obtained, in the literature for the full-order model of an induction motor: a global solution is presented here, by extending the global solution obtained by R. Marino et al. (see 15th IFAC World Congress, Barcelona, July 2002) for current-fed motors. A novel rotor speed observer is designed, while online integration of stator flux dynamics is required.","PeriodicalId":330283,"journal":{"name":"Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on","volume":"7 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":"127396073","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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