Pub Date : 1999-07-12DOI: 10.1109/ISIE.1999.801747
M. Milanovič, B. Sedmak, F. Mihalič, A. Hren
This paper considers the connection between switching matrix function and pulse width modulation algorithm with emphasis on the unity power factor correction requirements for three-phase three-level AC to DC converter. Based on the switching matrix converter theory, the switching sequences for PWM of the three-phase three-level AC to DC converter (rectifier) have been developed. Such an approach enables the input displacement factor correction without an input current sensor. The necessary control variable is only the measured displacement angle between the input voltage and the input current.
{"title":"PWM algorithm for three-phase three-level AC to DC boost rectifier","authors":"M. Milanovič, B. Sedmak, F. Mihalič, A. Hren","doi":"10.1109/ISIE.1999.801747","DOIUrl":"https://doi.org/10.1109/ISIE.1999.801747","url":null,"abstract":"This paper considers the connection between switching matrix function and pulse width modulation algorithm with emphasis on the unity power factor correction requirements for three-phase three-level AC to DC converter. Based on the switching matrix converter theory, the switching sequences for PWM of the three-phase three-level AC to DC converter (rectifier) have been developed. Such an approach enables the input displacement factor correction without an input current sensor. The necessary control variable is only the measured displacement angle between the input voltage and the input current.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128133723","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 : 1999-07-12DOI: 10.1109/ISIE.1999.798667
D. Neacşu
A review of the vectorial control methods for three-phase AC/DC boost converters is first presented. All blocks of the control scheme such as PWM, PI controllers are optimized. The problems associated with fast current dynamics at a step-down current reference due to the limited voltage available are explained both with solutions based on regular PI or novel synchronous reference frame hysteresis control.
{"title":"Vectorial current control techniques for three-phase AC/DC boost converters","authors":"D. Neacşu","doi":"10.1109/ISIE.1999.798667","DOIUrl":"https://doi.org/10.1109/ISIE.1999.798667","url":null,"abstract":"A review of the vectorial control methods for three-phase AC/DC boost converters is first presented. All blocks of the control scheme such as PWM, PI controllers are optimized. The problems associated with fast current dynamics at a step-down current reference due to the limited voltage available are explained both with solutions based on regular PI or novel synchronous reference frame hysteresis control.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132593321","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 : 1999-07-12DOI: 10.1109/ISIE.1999.798730
Doo-Jin shin, Uk-Youl Hah, Je-Hie Lee
In this paper, the authors propose a servo control system with an observer which can predict one step ahead states as well as disturbances. And also, they utilized two inertia modeling in order to deal with coupled system accurately. The overall control system consists of two parts-a servo controller and an observer. The state observer is designed with the Kalman filter algorithm to estimate the unknown states optimally. It is well known that the Kalman filter is an effective way to estimate the state of a dynamic system with a random noisy environment. A measurement error may occur due to a low resolution encoder in observer design. There are a number of disturbances in servo control systems due the observer which can estimate the disturbances using an inverse matrix of system dynamic equations to unexpected loads, parameter changes and other reasons. Simulation results are carried out to show that the proposed algorithm is able to estimate the speed and position stable and accurately. Also, the performance of the proposed algorithm is shown to be better than the average speed algorithm by some simulation results.
{"title":"An observer design for 2 inertia servo control system","authors":"Doo-Jin shin, Uk-Youl Hah, Je-Hie Lee","doi":"10.1109/ISIE.1999.798730","DOIUrl":"https://doi.org/10.1109/ISIE.1999.798730","url":null,"abstract":"In this paper, the authors propose a servo control system with an observer which can predict one step ahead states as well as disturbances. And also, they utilized two inertia modeling in order to deal with coupled system accurately. The overall control system consists of two parts-a servo controller and an observer. The state observer is designed with the Kalman filter algorithm to estimate the unknown states optimally. It is well known that the Kalman filter is an effective way to estimate the state of a dynamic system with a random noisy environment. A measurement error may occur due to a low resolution encoder in observer design. There are a number of disturbances in servo control systems due the observer which can estimate the disturbances using an inverse matrix of system dynamic equations to unexpected loads, parameter changes and other reasons. Simulation results are carried out to show that the proposed algorithm is able to estimate the speed and position stable and accurately. Also, the performance of the proposed algorithm is shown to be better than the average speed algorithm by some simulation results.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133311459","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 : 1999-07-12DOI: 10.1109/ISIE.1999.798719
L. Ben‐Brahim
This paper describes the application of the vector control technique to a three level or NPC (neutral point clamped) inverter using a DSP (digital signal processor) TMS320C25. A newly developed PWM technique for this kind of inverter is applied. As a result the switching losses as well as the current distortions are reduced. A smaller fluctuation of the neutral point voltage was also obtained. The proposed method was applied to a 20 kW motor using an NPC converter and inverter. Theoretical and practical aspects as well as the experimental results are presented in this report.
{"title":"Improvement of a PWM controlled NPC GTO inverter for AC motor drives","authors":"L. Ben‐Brahim","doi":"10.1109/ISIE.1999.798719","DOIUrl":"https://doi.org/10.1109/ISIE.1999.798719","url":null,"abstract":"This paper describes the application of the vector control technique to a three level or NPC (neutral point clamped) inverter using a DSP (digital signal processor) TMS320C25. A newly developed PWM technique for this kind of inverter is applied. As a result the switching losses as well as the current distortions are reduced. A smaller fluctuation of the neutral point voltage was also obtained. The proposed method was applied to a 20 kW motor using an NPC converter and inverter. Theoretical and practical aspects as well as the experimental results are presented in this report.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133486279","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 : 1999-07-12DOI: 10.1109/ISIE.1999.796788
Y. Suh, M. Lee
Stability of state delay systems is discussed by investigating properties of a Lyapunov functional. Firstly finite characterization of a Lyapunov functional equation for state delay systems is proposed. The finite characterization can be computed using a matrix exponential function, while conventional computation has been relied on numerical approximations. Secondly based on the finite characterization, a stability condition for state delay systems with unknown but bounded constant delay is proposed.
{"title":"Stability of state delay systems based on a Lyapunov functional","authors":"Y. Suh, M. Lee","doi":"10.1109/ISIE.1999.796788","DOIUrl":"https://doi.org/10.1109/ISIE.1999.796788","url":null,"abstract":"Stability of state delay systems is discussed by investigating properties of a Lyapunov functional. Firstly finite characterization of a Lyapunov functional equation for state delay systems is proposed. The finite characterization can be computed using a matrix exponential function, while conventional computation has been relied on numerical approximations. Secondly based on the finite characterization, a stability condition for state delay systems with unknown but bounded constant delay is proposed.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133015452","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 : 1999-07-12DOI: 10.1109/ISIE.1999.797024
A. Roskaric
With the double-buck and boost converter appearing in rectifier units, it is necessary to decrease the input current high harmonics distortion. A unity power factor operated rectifier requires two control-loop algorithms. The superior control is the voltage control loop. It provides reference signal to the inferior current control-loop. In order to get unity power factor rectifier operation the current reference must have sinusoidal wave-shape. This function is provided by using of an analog multiplier. This paper deals with a multiplier algorithm based on a pulse width modulation algorithm.
{"title":"Multiplier based on PWM in a double-buck and boost converter","authors":"A. Roskaric","doi":"10.1109/ISIE.1999.797024","DOIUrl":"https://doi.org/10.1109/ISIE.1999.797024","url":null,"abstract":"With the double-buck and boost converter appearing in rectifier units, it is necessary to decrease the input current high harmonics distortion. A unity power factor operated rectifier requires two control-loop algorithms. The superior control is the voltage control loop. It provides reference signal to the inferior current control-loop. In order to get unity power factor rectifier operation the current reference must have sinusoidal wave-shape. This function is provided by using of an analog multiplier. This paper deals with a multiplier algorithm based on a pulse width modulation algorithm.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134112253","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 : 1999-07-12DOI: 10.1109/ISIE.1999.797015
V. Podgorelec, P. Kokol
Decision support systems that help physicians are becoming a very important part of medical decision making. They are based on different models and the best of them are providing an explanation together with an accurate and reliable response. One of the most viable among models are decision trees, already used for many medical decision making purposes. Although effective and reliable, the traditional decision tree construction approach contains several deficiencies. Therefore, we decided to develop a self-adapting evolutionary decision support model, that uses evolutionary principles for the induction of decision trees. Our approach can be considered as a good choice for all kinds of real-world decision making, with respect to the advantages of our model, especially in various medical applications.
{"title":"Self-adapting evolutionary decision support model","authors":"V. Podgorelec, P. Kokol","doi":"10.1109/ISIE.1999.797015","DOIUrl":"https://doi.org/10.1109/ISIE.1999.797015","url":null,"abstract":"Decision support systems that help physicians are becoming a very important part of medical decision making. They are based on different models and the best of them are providing an explanation together with an accurate and reliable response. One of the most viable among models are decision trees, already used for many medical decision making purposes. Although effective and reliable, the traditional decision tree construction approach contains several deficiencies. Therefore, we decided to develop a self-adapting evolutionary decision support model, that uses evolutionary principles for the induction of decision trees. Our approach can be considered as a good choice for all kinds of real-world decision making, with respect to the advantages of our model, especially in various medical applications.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133498619","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 : 1999-07-12DOI: 10.1109/ISIE.1999.801808
B. Curk, K. Jezernik
In this work a new perturbation estimation sliding mode based control algorithm was introduced for a class of nonlinear mechatronics systems in the presence of structured and unstructured uncertainties and external disturbances. The effects of these uncertainties are combined into a single quantity called perturbation. The full order plant with the actuator voltages as control inputs is assumed in control design. The decentralised control shame with only the partial state feedback is applied. A modification of the switching functions with perturbation estimation is introduced. This modification enables the application of the proposed control algorithm also on reduced order plant with torques as control inputs. The salient feature of this approach is that the perturbations are effectively treated by a computationally straightforward procedure. The proposed controller is applied on a minimal configuration direct drive robot mechanism.
{"title":"Improved perturbation estimation in sliding mode motion control of DD robot","authors":"B. Curk, K. Jezernik","doi":"10.1109/ISIE.1999.801808","DOIUrl":"https://doi.org/10.1109/ISIE.1999.801808","url":null,"abstract":"In this work a new perturbation estimation sliding mode based control algorithm was introduced for a class of nonlinear mechatronics systems in the presence of structured and unstructured uncertainties and external disturbances. The effects of these uncertainties are combined into a single quantity called perturbation. The full order plant with the actuator voltages as control inputs is assumed in control design. The decentralised control shame with only the partial state feedback is applied. A modification of the switching functions with perturbation estimation is introduced. This modification enables the application of the proposed control algorithm also on reduced order plant with torques as control inputs. The salient feature of this approach is that the perturbations are effectively treated by a computationally straightforward procedure. The proposed controller is applied on a minimal configuration direct drive robot mechanism.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133904638","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 : 1999-07-12DOI: 10.1109/ISIE.1999.801749
U. Drofenik, J. Kolar
Integrated control circuits being available for the input current control of single-phase power factor correctors are frequently applied also for realizing a simple current control for each phase of a three-phase PWM rectifier system. There, the input currents are controlled independently although the three phases are mutually coupled, i.e., the sum of the phase currents is forced to zero for missing connections between the mains star point and the output voltage center point. However, ignoring of the coupling of the three phases results in increased amplitudes of harmonics with switching frequency and/or in a significantly higher ripple of the rectifier input current. This is shown in this paper by a detailed analysis of different current control concepts for a three-phase three-switch three-level boost-type PWM rectifier (VIENNA Rectifier I) with unity power factor. The theoretical considerations are verified by digital simulations and an experimental analysis of a laboratory prototype and are valid in general for three-phase boost-type voltage DC link PWM rectifier systems.
{"title":"Comparison of not synchronized sawtooth carrier and synchronized triangular carrier phase current control for the VIENNA rectifier I","authors":"U. Drofenik, J. Kolar","doi":"10.1109/ISIE.1999.801749","DOIUrl":"https://doi.org/10.1109/ISIE.1999.801749","url":null,"abstract":"Integrated control circuits being available for the input current control of single-phase power factor correctors are frequently applied also for realizing a simple current control for each phase of a three-phase PWM rectifier system. There, the input currents are controlled independently although the three phases are mutually coupled, i.e., the sum of the phase currents is forced to zero for missing connections between the mains star point and the output voltage center point. However, ignoring of the coupling of the three phases results in increased amplitudes of harmonics with switching frequency and/or in a significantly higher ripple of the rectifier input current. This is shown in this paper by a detailed analysis of different current control concepts for a three-phase three-switch three-level boost-type PWM rectifier (VIENNA Rectifier I) with unity power factor. The theoretical considerations are verified by digital simulations and an experimental analysis of a laboratory prototype and are valid in general for three-phase boost-type voltage DC link PWM rectifier systems.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133840347","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 : 1999-07-12DOI: 10.1109/ISIE.1999.798683
J. Espí, Á. Navarro, A. Ferreres, R. García, J. Maicas
The controlled sources method provides a direct graphical technique to construct large-signal circuits of resonant inverters. In this article the method is varied to be suitable for modeling DC-DC resonant converters as well. The modified controlled sources method is illustrated with examples, and the PSpice implementation of the series resonant converter is given. All static and dynamic characteristics of the resonant converter can be deduced by means of DC-sweep and AC-sweep simulations of this model.
{"title":"Obtaining large-signal circuits of DC-DC resonant converters using the \"controlled sources method\"","authors":"J. Espí, Á. Navarro, A. Ferreres, R. García, J. Maicas","doi":"10.1109/ISIE.1999.798683","DOIUrl":"https://doi.org/10.1109/ISIE.1999.798683","url":null,"abstract":"The controlled sources method provides a direct graphical technique to construct large-signal circuits of resonant inverters. In this article the method is varied to be suitable for modeling DC-DC resonant converters as well. The modified controlled sources method is illustrated with examples, and the PSpice implementation of the series resonant converter is given. All static and dynamic characteristics of the resonant converter can be deduced by means of DC-sweep and AC-sweep simulations of this model.","PeriodicalId":227402,"journal":{"name":"ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121448789","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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