Pub Date : 1990-12-01DOI: 10.1109/PESC.1990.131229
P. Krein, R. Bass
A systematic approach to the formulation of continuous-time dynamic equations for switching power converters is presented. A new modeling formalism for semiconductor switches is developed as part of this approach. The general structure of the equations is investigated, and, based on a geometric interpretation of the equations, a classification scheme is proposed. Nonlinear methods for analysis and control appropriate to each class are examined. A comparison of current mode and voltage mode DC-DC power converter control is presented as an example.<>
{"title":"Geometric formulation, classification and methods for power electronic systems","authors":"P. Krein, R. Bass","doi":"10.1109/PESC.1990.131229","DOIUrl":"https://doi.org/10.1109/PESC.1990.131229","url":null,"abstract":"A systematic approach to the formulation of continuous-time dynamic equations for switching power converters is presented. A new modeling formalism for semiconductor switches is developed as part of this approach. The general structure of the equations is investigated, and, based on a geometric interpretation of the equations, a classification scheme is proposed. Nonlinear methods for analysis and control appropriate to each class are examined. A comparison of current mode and voltage mode DC-DC power converter control is presented as an example.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"24 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128643240","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 : 1990-06-11DOI: 10.1109/PESC.1990.131173
G. Venkataramanan, D. Divan
Sliding mode control for resonant link converters is introduced in a formal manner through a specific example of a buck resonant link DC-DC converter. The use of variable structure systems theory as a valuable tool to characterize the dynamic behavior of discrete pulse modulated systems in demonstrated. The suboptimal steady-state behavior of discrete pulse modulated converters under conventional control methods is brought out. The discrete time integral sliding mode control as an alternative control method with better performance attributes is proposed. It is demonstrated that the sliding mode control methods developed for the control of a PWM (pulse width modulation) power converter can be extended to the resonant link converter operating under discrete pulse modulation, and the performance can be improved by adding the integral-error term to the sliding surface. The conditions for sliding mode to exist under integral sliding control are obtained. All the results are verified by simulation, and experimental results confirming the concepts are presented.<>
{"title":"Discrete time integral sliding mode control for discrete pulse modulated converters","authors":"G. Venkataramanan, D. Divan","doi":"10.1109/PESC.1990.131173","DOIUrl":"https://doi.org/10.1109/PESC.1990.131173","url":null,"abstract":"Sliding mode control for resonant link converters is introduced in a formal manner through a specific example of a buck resonant link DC-DC converter. The use of variable structure systems theory as a valuable tool to characterize the dynamic behavior of discrete pulse modulated systems in demonstrated. The suboptimal steady-state behavior of discrete pulse modulated converters under conventional control methods is brought out. The discrete time integral sliding mode control as an alternative control method with better performance attributes is proposed. It is demonstrated that the sliding mode control methods developed for the control of a PWM (pulse width modulation) power converter can be extended to the resonant link converter operating under discrete pulse modulation, and the performance can be improved by adding the integral-error term to the sliding surface. The conditions for sliding mode to exist under integral sliding control are obtained. All the results are verified by simulation, and experimental results confirming the concepts are presented.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128517059","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 : 1990-06-11DOI: 10.1109/PESC.1990.131204
A. Gole, V. Sood
The development and implementation of a static VAr (volt-ampere reactive) compensator (SVC) model for digital transient simulation packages are described. The SVC model consists of a 12-pulse thyristor controlled reactor (TCR) with a thyristor switched capacitor (TSC). The equations for the circuit are obtained in state variable form using graph theory techniques and result in accurate, numerically stable solutions. The switching of the TSC capacitors has been modeled in a novel manner that saves on storage and computation time. The method of interfacing the model to a power system transients program is discussed. The transients program can be used to model large power systems external to the SVC model. A demonstration of the use of the SVC model in a power system simulation with the EMTDC packager is presented.<>
{"title":"Development of a state variable-based static compensator model","authors":"A. Gole, V. Sood","doi":"10.1109/PESC.1990.131204","DOIUrl":"https://doi.org/10.1109/PESC.1990.131204","url":null,"abstract":"The development and implementation of a static VAr (volt-ampere reactive) compensator (SVC) model for digital transient simulation packages are described. The SVC model consists of a 12-pulse thyristor controlled reactor (TCR) with a thyristor switched capacitor (TSC). The equations for the circuit are obtained in state variable form using graph theory techniques and result in accurate, numerically stable solutions. The switching of the TSC capacitors has been modeled in a novel manner that saves on storage and computation time. The method of interfacing the model to a power system transients program is discussed. The transients program can be used to model large power systems external to the SVC model. A demonstration of the use of the SVC model in a power system simulation with the EMTDC packager is presented.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123946119","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 : 1990-06-11DOI: 10.1109/PESC.1990.131277
G. Joung, J.G. Cho, G. Cho
For generalization of the soft-switching-based quantum resonant converters including AC/AC conversion applications, a new concept of quantum resonant switches which include quantum series resonant switches (QSRS) and quantum parallel resonant switches (QPRS) is proposed. The quantum resonant switches are modeled as an equivalent inductor for QSRS and equivalent capacitor for QPRS. The basic conventional PWM (pulse-width-modulated) DC/DC and AC/AC converters can be changed to the corresponding quantum resonant converters with the same global characteristics by replacing the link inductor or capacitor with the proposed QSRS or QPRS. Thus, the conventional modeling and design methods can also be applied to quantum resonant converters. In this procedure, a number of useful quantum resonant AC/AC converter which can improve the characteristics of the high-frequency DC-link AC/AC converters are proposed. Experimental verifications of the modeling of the quantum resonant switches and the topologies and basic operations of the proposed quantum resonant DC/DC and AC/AC converters are presented.<>
{"title":"Generalized quantum resonant converters using a new concepts of quantum resonant switch","authors":"G. Joung, J.G. Cho, G. Cho","doi":"10.1109/PESC.1990.131277","DOIUrl":"https://doi.org/10.1109/PESC.1990.131277","url":null,"abstract":"For generalization of the soft-switching-based quantum resonant converters including AC/AC conversion applications, a new concept of quantum resonant switches which include quantum series resonant switches (QSRS) and quantum parallel resonant switches (QPRS) is proposed. The quantum resonant switches are modeled as an equivalent inductor for QSRS and equivalent capacitor for QPRS. The basic conventional PWM (pulse-width-modulated) DC/DC and AC/AC converters can be changed to the corresponding quantum resonant converters with the same global characteristics by replacing the link inductor or capacitor with the proposed QSRS or QPRS. Thus, the conventional modeling and design methods can also be applied to quantum resonant converters. In this procedure, a number of useful quantum resonant AC/AC converter which can improve the characteristics of the high-frequency DC-link AC/AC converters are proposed. Experimental verifications of the modeling of the quantum resonant switches and the topologies and basic operations of the proposed quantum resonant DC/DC and AC/AC converters are presented.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"34 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116490076","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 : 1990-06-11DOI: 10.1109/PESC.1990.131201
R.R. Beasant, W. Beattie, A. Refsum
The problems of current commutation in the Venturini converter are examined with a view to reducing losses and device stress. An active magnetic filter is proposed for use with bidirectional switches. A new form of switch control is proposed which makes use of both natural and forced commutation as a means of using existing unidirectional semiconductor devices to realize a practical, high-power converter. Commutation losses have been reduced to the level associated with standard DC-to-AC inverters. The hardware required to control seminatural commutation has been shown to be very simple, and could be implemented on a single chip such as a PAL, including basic short-circuit protection. The active magnetic filter technique is capable of distinguishing between load and circulating currents during commutation and can reduce the associated loss by up to a factor of 100.<>
{"title":"An approach to the realization of a high-power Venturini converter","authors":"R.R. Beasant, W. Beattie, A. Refsum","doi":"10.1109/PESC.1990.131201","DOIUrl":"https://doi.org/10.1109/PESC.1990.131201","url":null,"abstract":"The problems of current commutation in the Venturini converter are examined with a view to reducing losses and device stress. An active magnetic filter is proposed for use with bidirectional switches. A new form of switch control is proposed which makes use of both natural and forced commutation as a means of using existing unidirectional semiconductor devices to realize a practical, high-power converter. Commutation losses have been reduced to the level associated with standard DC-to-AC inverters. The hardware required to control seminatural commutation has been shown to be very simple, and could be implemented on a single chip such as a PAL, including basic short-circuit protection. The active magnetic filter technique is capable of distinguishing between load and circulating currents during commutation and can reduce the associated loss by up to a factor of 100.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"55 23 Suppl 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125996527","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 : 1990-06-11DOI: 10.1109/PESC.1990.131268
J. Ferreira
An analytical method to calculate the AC resistance of round conductor windings is derived. It is shown that the skin effect and proximity effect are orthogonal to each other, which means that their losses can be calculated separately and then simply added together. It is shown that this method of calculation is inherently much more accurate than a popular existing method using an equivalent rectangular conductor and a one-dimensional cartesian coordinate system solution.<>
{"title":"Appropriate modelling of conductive losses in the design of magnetic components","authors":"J. Ferreira","doi":"10.1109/PESC.1990.131268","DOIUrl":"https://doi.org/10.1109/PESC.1990.131268","url":null,"abstract":"An analytical method to calculate the AC resistance of round conductor windings is derived. It is shown that the skin effect and proximity effect are orthogonal to each other, which means that their losses can be calculated separately and then simply added together. It is shown that this method of calculation is inherently much more accurate than a popular existing method using an equivalent rectangular conductor and a one-dimensional cartesian coordinate system solution.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121928426","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 : 1990-06-11DOI: 10.1109/PESC.1990.131241
E. Levi, S. Vukosavic, V. Vučković
Modifications that are necessary in the structures of rotor flux computers and indirect vector controllers in order to take into account the main flux saturation are considered. The schemes discussed are based on measurement of the main flux and stator currents, stator voltages and stator currents, and stator currents and rotor speed. Particular attention is given to a calculator based on stator currents and rotor speed as measured variables and to simplified saturated indirect vector controllers. Verification of the proposed saturated rotor flux calculators and indirect vector controllers is provided by means of digital simulation. One of the schemes is applied in a vector-controlled induction motor drive, and experimental results are included.<>
{"title":"Saturation compensation schemes for vector controlled induction motor drives","authors":"E. Levi, S. Vukosavic, V. Vučković","doi":"10.1109/PESC.1990.131241","DOIUrl":"https://doi.org/10.1109/PESC.1990.131241","url":null,"abstract":"Modifications that are necessary in the structures of rotor flux computers and indirect vector controllers in order to take into account the main flux saturation are considered. The schemes discussed are based on measurement of the main flux and stator currents, stator voltages and stator currents, and stator currents and rotor speed. Particular attention is given to a calculator based on stator currents and rotor speed as measured variables and to simplified saturated indirect vector controllers. Verification of the proposed saturated rotor flux calculators and indirect vector controllers is provided by means of digital simulation. One of the schemes is applied in a vector-controlled induction motor drive, and experimental results are included.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116403826","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 : 1990-06-11DOI: 10.1109/PESC.1990.131205
G. Karady
A new power supply which permits the independent regulation of the active and reactive power of a superconductive magnetic energy storage (SMES) system is discussed. The power supply consists of 20 units connected in parallel. Each unit contains a 24-pulse bridge converter, a thyristor switched capacitor bank. An SMES system using the power supply is capable of improving power system stability and oscillation damping, as well as performing load leveling. The power supply can be built with commercially available components using well-proven technology.<>
{"title":"Adaptable power supply for superconductive magnetic energy storage system","authors":"G. Karady","doi":"10.1109/PESC.1990.131205","DOIUrl":"https://doi.org/10.1109/PESC.1990.131205","url":null,"abstract":"A new power supply which permits the independent regulation of the active and reactive power of a superconductive magnetic energy storage (SMES) system is discussed. The power supply consists of 20 units connected in parallel. Each unit contains a 24-pulse bridge converter, a thyristor switched capacitor bank. An SMES system using the power supply is capable of improving power system stability and oscillation damping, as well as performing load leveling. The power supply can be built with commercially available components using well-proven technology.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"216 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121975276","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 : 1990-06-11DOI: 10.1109/PESC.1990.131242
T. Matsuo, V. Blasko, J. Moreira, T. Lipo
A novel direct field-oriented control scheme for induction motor drive applications that employs rotor end ring current detection and removes the dependence of the controller accuracy on temperature is presented. This field orientation scheme does not require an incremental encoder for rotor position sensing. The motor torque can be accurately controlled even down to zero frequency operation. The controller is completely independent of rotor time constant variations. The rotor end ring current is measured via Hall-effect sensors. An adaptive controller for the rotor current gains eliminates the error introduced in the measurement due to temperature changes of the Hall sensors. Consequently, the field-oriented controller remains robust, even for conditions where the machine internal air temperature reaches 100 degrees C. Experimental results showing the practical feasibility of the proposed direct field-oriented controller are presented.<>
{"title":"A new direct field oriented controller employing rotor end ring current detection","authors":"T. Matsuo, V. Blasko, J. Moreira, T. Lipo","doi":"10.1109/PESC.1990.131242","DOIUrl":"https://doi.org/10.1109/PESC.1990.131242","url":null,"abstract":"A novel direct field-oriented control scheme for induction motor drive applications that employs rotor end ring current detection and removes the dependence of the controller accuracy on temperature is presented. This field orientation scheme does not require an incremental encoder for rotor position sensing. The motor torque can be accurately controlled even down to zero frequency operation. The controller is completely independent of rotor time constant variations. The rotor end ring current is measured via Hall-effect sensors. An adaptive controller for the rotor current gains eliminates the error introduced in the measurement due to temperature changes of the Hall sensors. Consequently, the field-oriented controller remains robust, even for conditions where the machine internal air temperature reaches 100 degrees C. Experimental results showing the practical feasibility of the proposed direct field-oriented controller are presented.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"BC-29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126717792","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 : 1990-06-11DOI: 10.1109/PESC.1990.131255
S. Ohtsu, K. Yamamoto, T. Sugiura
The authors analyze the relationship between the magnetizing inductance of a transformer and a choke-coil required to enhance the switching frequency and maintain a stable operation without increasing the power loss of high-voltage power supplies. The relationship between the transformer magnetizing inductance and the switching frequency in the highly efficient stable operation of a high-voltage output push-pull current-fed converter is also defined. Based on the analysis, high-voltage output power supplies can be designed raising the switching frequency from approximately 20 kHz to 200 kHz, without an increase in power loss. It is experimentally show that the efficiency is high over a wide frequency range if the transformer and the choke-coil magnetizing inductance have suitable values.<>
{"title":"Stable conditions in high-voltage output push-pull current-fed converters","authors":"S. Ohtsu, K. Yamamoto, T. Sugiura","doi":"10.1109/PESC.1990.131255","DOIUrl":"https://doi.org/10.1109/PESC.1990.131255","url":null,"abstract":"The authors analyze the relationship between the magnetizing inductance of a transformer and a choke-coil required to enhance the switching frequency and maintain a stable operation without increasing the power loss of high-voltage power supplies. The relationship between the transformer magnetizing inductance and the switching frequency in the highly efficient stable operation of a high-voltage output push-pull current-fed converter is also defined. Based on the analysis, high-voltage output power supplies can be designed raising the switching frequency from approximately 20 kHz to 200 kHz, without an increase in power loss. It is experimentally show that the efficiency is high over a wide frequency range if the transformer and the choke-coil magnetizing inductance have suitable values.<<ETX>>","PeriodicalId":330807,"journal":{"name":"21st Annual IEEE Conference on Power Electronics Specialists","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126437299","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：