Pub Date : 2000-12-04DOI: 10.1109/ISIE.2000.930520
C. Attaianese, D. Capraro, G. Tomasso
A space vector modulator with variable clock frequency is presented in the paper. It is based on the selection of the appropriate modulator clock frequency according to the minimum value of the switching states duration. The purpose is to reduce at the same time the dead time effect on the voltage inverter output waveform, the harmonic content and switching losses. The proposed techniques has been implemented by means of a digital modulator realized by using programmable logic devices. Several tests have been performed and the results compared with the fixed frequency modulation techniques.
{"title":"A variable frequency space vector modulator for VSI fed induction motor drives","authors":"C. Attaianese, D. Capraro, G. Tomasso","doi":"10.1109/ISIE.2000.930520","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930520","url":null,"abstract":"A space vector modulator with variable clock frequency is presented in the paper. It is based on the selection of the appropriate modulator clock frequency according to the minimum value of the switching states duration. The purpose is to reduce at the same time the dead time effect on the voltage inverter output waveform, the harmonic content and switching losses. The proposed techniques has been implemented by means of a digital modulator realized by using programmable logic devices. Several tests have been performed and the results compared with the fixed frequency modulation techniques.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"347 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124533999","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930345
M. Tamate, H. Ohguchi, M. Hayashi, T. Shimizu, H. Takagi, M. Ito
In recent years, immittance conversion theory has attracted interest as a novel power conversion approach. Immittance conversion is defined by the fact that the impedance at the sending end of the conversion circuitry is proportional to the admittance at the receiving end. In other words, it is possible to convert voltage source into current source, or vice-versa. Two types of immittance conversion elements, such as distributed constant line and lumped L-C circuit, have been proposed. However, the application of these immittance conversion elements to power converters have some restrictions because of their inherent defects. A novel immittance conversion element, which the authors call "/spl pi/-LC circuit", is proposed in order to overcome these defects. This proposed circuit converts the fundamental and the third harmonic components in conformity with the immittance conversion theory. The /spl pi/-LC circuit is expected to apply to various power converters. The practical applications of the immittance conversion element, such as DC power supply and utility interactive inverter, are presented. The effectiveness of these converters is confirmed by simulation and experiment.
{"title":"A novel approach of power converter topology based on the immittance conversion theory","authors":"M. Tamate, H. Ohguchi, M. Hayashi, T. Shimizu, H. Takagi, M. Ito","doi":"10.1109/ISIE.2000.930345","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930345","url":null,"abstract":"In recent years, immittance conversion theory has attracted interest as a novel power conversion approach. Immittance conversion is defined by the fact that the impedance at the sending end of the conversion circuitry is proportional to the admittance at the receiving end. In other words, it is possible to convert voltage source into current source, or vice-versa. Two types of immittance conversion elements, such as distributed constant line and lumped L-C circuit, have been proposed. However, the application of these immittance conversion elements to power converters have some restrictions because of their inherent defects. A novel immittance conversion element, which the authors call \"/spl pi/-LC circuit\", is proposed in order to overcome these defects. This proposed circuit converts the fundamental and the third harmonic components in conformity with the immittance conversion theory. The /spl pi/-LC circuit is expected to apply to various power converters. The practical applications of the immittance conversion element, such as DC power supply and utility interactive inverter, are presented. The effectiveness of these converters is confirmed by simulation and experiment.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127611127","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930372
V. Ponomaryov, O. Pogrebnyak, L. N. de Rivera, J.C. Garcia
Differential GPS (DGPS) is the system used for improving accuracy in GPS position and velocity estimation. Measurements can be obtained in real time with a high level of accuracy. We present a modified Kalman filter for DGPS to enhance the estimation of the position and velocity. The realized algorithm in DGPS system can be implemented by low cost commercial C/A code GPS modules. The Kalman filter used reduces the anti-common errors between the users and reference station. Two variants of the filters have been investigated. The experimental testing of the performance of DGPS with Kalman filtering has been realized and discussed in the paper. The investigated procedures of Kalman filtering could be used for better positioning in the applications.
{"title":"Increasing the accuracy of differential global positioning system by means of use the Kalman filtering technique","authors":"V. Ponomaryov, O. Pogrebnyak, L. N. de Rivera, J.C. Garcia","doi":"10.1109/ISIE.2000.930372","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930372","url":null,"abstract":"Differential GPS (DGPS) is the system used for improving accuracy in GPS position and velocity estimation. Measurements can be obtained in real time with a high level of accuracy. We present a modified Kalman filter for DGPS to enhance the estimation of the position and velocity. The realized algorithm in DGPS system can be implemented by low cost commercial C/A code GPS modules. The Kalman filter used reduces the anti-common errors between the users and reference station. Two variants of the filters have been investigated. The experimental testing of the performance of DGPS with Kalman filtering has been realized and discussed in the paper. The investigated procedures of Kalman filtering could be used for better positioning in the applications.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121966205","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930363
P. Rodríguez-Peralta, M. Nakano-Miyatake, H. Perez-Meana, G. Duchén-Sánchez
For basic level students of foreign languages, normal speed speaking is very difficult to understand perfectly, because of lack of training in understanding of oral language. However when the speed of speaking slows down, in most cases understanding increases. This fact suggests that to improve learning of the foreign language, it is necessary that students can adjust the speed of speaking according to their own understanding level. This paper presents a comparison of two time scaling algorithms when they are used to assist learning of a foreign language. Both algorithms consist of a pitch detection stage and time scaling stage. The pitch detection of both algorithms is based on autocorrelation method of the speech signals proposed by Rabiner et. al. (1976). The time scaling in the first method consists in duplicating the pitch periods of voiced segments while keeping unchanged unvoiced ones. The second method is based on the short time Fourier transform. Experimental results, MOS (mean opinion scoring) are given using Spanish, French, German, Russian, Japanese and Italian which show desirable features of both time scaling algorithms when they are used to assist the students to learn foreign languages. The performance of both algorithms when the pitch detection stage has some noise is also shown.
{"title":"Time scaling algorithm of speech signal to assist learning of a foreign language","authors":"P. Rodríguez-Peralta, M. Nakano-Miyatake, H. Perez-Meana, G. Duchén-Sánchez","doi":"10.1109/ISIE.2000.930363","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930363","url":null,"abstract":"For basic level students of foreign languages, normal speed speaking is very difficult to understand perfectly, because of lack of training in understanding of oral language. However when the speed of speaking slows down, in most cases understanding increases. This fact suggests that to improve learning of the foreign language, it is necessary that students can adjust the speed of speaking according to their own understanding level. This paper presents a comparison of two time scaling algorithms when they are used to assist learning of a foreign language. Both algorithms consist of a pitch detection stage and time scaling stage. The pitch detection of both algorithms is based on autocorrelation method of the speech signals proposed by Rabiner et. al. (1976). The time scaling in the first method consists in duplicating the pitch periods of voiced segments while keeping unchanged unvoiced ones. The second method is based on the short time Fourier transform. Experimental results, MOS (mean opinion scoring) are given using Spanish, French, German, Russian, Japanese and Italian which show desirable features of both time scaling algorithms when they are used to assist the students to learn foreign languages. The performance of both algorithms when the pitch detection stage has some noise is also shown.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131851167","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930528
E. Wiechmann, R. Burgos, J. Rodríguez
This paper proposes an active front end (AFE) converter for medium voltage current source drives. The converter comprises a 12-pulse isolation transformer and two PWM current source rectifiers (CSR) with GTO thyristors. The converter operates with a switching frequency of 100 Hz (2 p.u.), thus reducing its commutation losses by 66% compared to previous PWM approaches. Also, the converter independently controls its active and reactive power flow, thus being able to operate as a VAr compensator to the power system. Under this scheme, unity power factor is achieved by setting the reactive power reference to zero. The converter's control system is built over an inner d-q axes synchronous frame current loop, and a DC link current and reactive power outer loops to control the d and q axes respectively. Linear controllers are used in all loops except the DC link. A nonlinear controller is employed to linearize this loop, hence avoiding instabilities during regenerative operation. All these features were achieved using staggered sampling space vector modulation (SVM), which assures harmonic cancellation between both PWM-CSR through the feeding transformer. Moreover, the use of SVM avoids all complications associated with selective harmonic elimination techniques (usually employed in these converters). Specifically, solving nonlinear equations and distributing shorting pulses. Simulation results obtained under different operating conditions validate the proposed AFE converter for medium voltage current source drives.
{"title":"Reduced switching frequency active front end converter for medium voltage current-source drives using space vector modulation","authors":"E. Wiechmann, R. Burgos, J. Rodríguez","doi":"10.1109/ISIE.2000.930528","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930528","url":null,"abstract":"This paper proposes an active front end (AFE) converter for medium voltage current source drives. The converter comprises a 12-pulse isolation transformer and two PWM current source rectifiers (CSR) with GTO thyristors. The converter operates with a switching frequency of 100 Hz (2 p.u.), thus reducing its commutation losses by 66% compared to previous PWM approaches. Also, the converter independently controls its active and reactive power flow, thus being able to operate as a VAr compensator to the power system. Under this scheme, unity power factor is achieved by setting the reactive power reference to zero. The converter's control system is built over an inner d-q axes synchronous frame current loop, and a DC link current and reactive power outer loops to control the d and q axes respectively. Linear controllers are used in all loops except the DC link. A nonlinear controller is employed to linearize this loop, hence avoiding instabilities during regenerative operation. All these features were achieved using staggered sampling space vector modulation (SVM), which assures harmonic cancellation between both PWM-CSR through the feeding transformer. Moreover, the use of SVM avoids all complications associated with selective harmonic elimination techniques (usually employed in these converters). Specifically, solving nonlinear equations and distributing shorting pulses. Simulation results obtained under different operating conditions validate the proposed AFE converter for medium voltage current source drives.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115794929","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930510
Ming-Sheng Yang
A design scheme of smoothed switching structure theory based load-frequency control for power systems including parameter uncertainties is presented in this paper. However, knowledge about the bounds of the parameter uncertainties is required for controller design. The basic concept and design scheme of switching structure control are briefly discussed. The design process of load-frequency control using a linearized model with parameter uncertainties, which are obtained by simultaneously changing parameters by 55% to 95% from their nominal values, consists of key steps including both approximating continuous control law with sliding mode property, and the special switching hyperplane to enhance the system stability degree. The simulation results show that the proposed controller can not only improve the dynamic stability of the power system but also achieves good performance for all admissible uncertainties.
{"title":"Load-frequency control scheme for power systems using smoothed switching structure theory","authors":"Ming-Sheng Yang","doi":"10.1109/ISIE.2000.930510","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930510","url":null,"abstract":"A design scheme of smoothed switching structure theory based load-frequency control for power systems including parameter uncertainties is presented in this paper. However, knowledge about the bounds of the parameter uncertainties is required for controller design. The basic concept and design scheme of switching structure control are briefly discussed. The design process of load-frequency control using a linearized model with parameter uncertainties, which are obtained by simultaneously changing parameters by 55% to 95% from their nominal values, consists of key steps including both approximating continuous control law with sliding mode property, and the special switching hyperplane to enhance the system stability degree. The simulation results show that the proposed controller can not only improve the dynamic stability of the power system but also achieves good performance for all admissible uncertainties.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123606486","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930343
I. Ando, I. Takahashi
This paper describes the general theory of the main circuit constructions and control methods of legs based on output neutral point voltage control under multi-leg power conversion circuits. A controllable fluctuation range of the output neutral point voltage is obtained by the linear programming method under the condition of the desired symmetrical sinusoidal line output voltage. From the analysis, the following points are obtained: (1) the main circuits and control methods of the multi-leg power conversion circuits are constructed by simple theory based on output neutral point voltage control; (2) the controllable maximum line voltage of the each ideal main power circuits is obtained by calculating of the minimum controllable fluctuation range of the output neutral point voltage; and (3) the removed and the common leg conversion circuits can also be realized by simple neutral point voltage control, and high efficiency, low cost and small size converters are achieved. It is clear that this theory expands conventional schemes and it is simple and standard theory on the all multi-leg conversion circuits in the case of symmetrical sinusoidal line output voltage.
{"title":"General theory of multi-leg power conversion circuits based on neutral point voltage","authors":"I. Ando, I. Takahashi","doi":"10.1109/ISIE.2000.930343","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930343","url":null,"abstract":"This paper describes the general theory of the main circuit constructions and control methods of legs based on output neutral point voltage control under multi-leg power conversion circuits. A controllable fluctuation range of the output neutral point voltage is obtained by the linear programming method under the condition of the desired symmetrical sinusoidal line output voltage. From the analysis, the following points are obtained: (1) the main circuits and control methods of the multi-leg power conversion circuits are constructed by simple theory based on output neutral point voltage control; (2) the controllable maximum line voltage of the each ideal main power circuits is obtained by calculating of the minimum controllable fluctuation range of the output neutral point voltage; and (3) the removed and the common leg conversion circuits can also be realized by simple neutral point voltage control, and high efficiency, low cost and small size converters are achieved. It is clear that this theory expands conventional schemes and it is simple and standard theory on the all multi-leg conversion circuits in the case of symmetrical sinusoidal line output voltage.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124865419","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930523
R. Ortega, N. Barabanov, G. Escobar
Practitioners in the electric drives community have introduced a novel torque control strategy for high power induction motor applications called direct torque control (DTC), which has three distinctive features: it focuses on stator (instead of rotor) flux regulation, it does not aim at an asymptotic system inversion (hence it does not require additional current loops), and it explicitly takes into account the discrete nature of the control actions, which are simply points of a finite set obtained from a switching logic. Besides its simplicity, it is claimed that the achieved performance is (in some instances) superior to classical field oriented strategies because of the digital form of the control structure and the reduced dependence on parameter variations of the stator flux calculations. Our objective in this paper is twofold, first to carry out a mathematical analysis of the stabilization mechanism of DTC, which helps us assess the achievable performance of the current scheme and provide guidelines for its tuning. Second, to propose a modified DTC to improve its dynamical behavior. Experimental results are presented to illustrate the main points of our paper.
{"title":"Direct torque control of induction motors: stability analysis and performance improvement","authors":"R. Ortega, N. Barabanov, G. Escobar","doi":"10.1109/ISIE.2000.930523","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930523","url":null,"abstract":"Practitioners in the electric drives community have introduced a novel torque control strategy for high power induction motor applications called direct torque control (DTC), which has three distinctive features: it focuses on stator (instead of rotor) flux regulation, it does not aim at an asymptotic system inversion (hence it does not require additional current loops), and it explicitly takes into account the discrete nature of the control actions, which are simply points of a finite set obtained from a switching logic. Besides its simplicity, it is claimed that the achieved performance is (in some instances) superior to classical field oriented strategies because of the digital form of the control structure and the reduced dependence on parameter variations of the stator flux calculations. Our objective in this paper is twofold, first to carry out a mathematical analysis of the stabilization mechanism of DTC, which helps us assess the achievable performance of the current scheme and provide guidelines for its tuning. Second, to propose a modified DTC to improve its dynamical behavior. Experimental results are presented to illustrate the main points of our paper.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127204418","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930509
Ming-Sheng Yang
This paper proposes a robust control strategy to study the decentralized load-frequency control problem of multi-area interconnected power systems with parameter uncertainties using sliding mode control. It comprises N local robust load-frequency controllers for an N-area power system. The bounds of system parameter uncertainties are also considered for robustness. A method of eliminating the chattering encountered in load-frequency controllers combining the sliding mode control technique is presented. Overall system stability, for all admissible system parameter uncertainties and the generation-rate constraint, is ensured when the robust load-frequency controller and sliding mode controller are in operation. The effectiveness of the proposed robust control scheme has been verified through simulation studies on a three-area interconnected power system model.
{"title":"Decentralized sliding mode stabilizer design for multi-area interconnected power systems","authors":"Ming-Sheng Yang","doi":"10.1109/ISIE.2000.930509","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930509","url":null,"abstract":"This paper proposes a robust control strategy to study the decentralized load-frequency control problem of multi-area interconnected power systems with parameter uncertainties using sliding mode control. It comprises N local robust load-frequency controllers for an N-area power system. The bounds of system parameter uncertainties are also considered for robustness. A method of eliminating the chattering encountered in load-frequency controllers combining the sliding mode control technique is presented. Overall system stability, for all admissible system parameter uncertainties and the generation-rate constraint, is ensured when the robust load-frequency controller and sliding mode controller are in operation. The effectiveness of the proposed robust control scheme has been verified through simulation studies on a three-area interconnected power system model.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132950635","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 : 2000-12-04DOI: 10.1109/ISIE.2000.930340
J. Espinoza, G. Joós, M. Perez, T. Moran
Pulse-width modulated current-source and voltage-source rectifiers are becoming an interesting alternative as a source of variable DC power. Advantages include reduced line current harmonic distortion and complete displacement power factor control, including reactive power compensation. Consequently, literature has recently reported different control strategies, where the active power flows from the AC mains into the load. Unfortunately, when active power flows from the load into the converter, it is usually dissipated in the DC link by means of switched resistors. Such approach reduces the overall efficiency; specially, when regeneration is the normal operating mode as in down-hill belt conveyors and electrical shovels in mining applications. In these cases, the regenerative operating mode should be permanently sustained. This work reviews several important issues concerning such an operating mode; specifically, the stability of the converter-load system, and stability analysis of closed loop operation. The paper shows that PWM rectifiers controlled by a regular linear controller (such as PIs) may become unstable under the regenerative operating mode and analyses a control strategy to overcome such difficulties. Simulated results confirm the validity of theoretical considerations.
{"title":"Stability issues in three-phase PWM current/voltage source rectifiers in the regeneration mode","authors":"J. Espinoza, G. Joós, M. Perez, T. Moran","doi":"10.1109/ISIE.2000.930340","DOIUrl":"https://doi.org/10.1109/ISIE.2000.930340","url":null,"abstract":"Pulse-width modulated current-source and voltage-source rectifiers are becoming an interesting alternative as a source of variable DC power. Advantages include reduced line current harmonic distortion and complete displacement power factor control, including reactive power compensation. Consequently, literature has recently reported different control strategies, where the active power flows from the AC mains into the load. Unfortunately, when active power flows from the load into the converter, it is usually dissipated in the DC link by means of switched resistors. Such approach reduces the overall efficiency; specially, when regeneration is the normal operating mode as in down-hill belt conveyors and electrical shovels in mining applications. In these cases, the regenerative operating mode should be permanently sustained. This work reviews several important issues concerning such an operating mode; specifically, the stability of the converter-load system, and stability analysis of closed loop operation. The paper shows that PWM rectifiers controlled by a regular linear controller (such as PIs) may become unstable under the regenerative operating mode and analyses a control strategy to overcome such difficulties. Simulated results confirm the validity of theoretical considerations.","PeriodicalId":298625,"journal":{"name":"ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130911721","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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