Pub Date : 1996-06-23DOI: 10.1109/PESC.1996.548715
D. Perreault, R.L. Selders, J. Kassakian
This paper introduces a new current-sharing technique for paralleled power converters which is based on frequency encoding of the current-sharing information. The approach has significant advantages over existing methods, including the ability to isolate the transformer or eliminate current-sharing control connections. Operation of the current-sharing technique is analyzed, and experimental results from a 3-cell prototype system are presented.
{"title":"Frequency-based current-sharing techniques for paralleled power converters","authors":"D. Perreault, R.L. Selders, J. Kassakian","doi":"10.1109/PESC.1996.548715","DOIUrl":"https://doi.org/10.1109/PESC.1996.548715","url":null,"abstract":"This paper introduces a new current-sharing technique for paralleled power converters which is based on frequency encoding of the current-sharing information. The approach has significant advantages over existing methods, including the ability to isolate the transformer or eliminate current-sharing control connections. Operation of the current-sharing technique is analyzed, and experimental results from a 3-cell prototype system are presented.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"16 1","pages":"1073-1079 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91014167","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 : 1996-06-23DOI: 10.1109/PESC.1996.548709
H. J. Beukes, J. Enslin, R. Spée
In this paper the performance of the auxiliary resonant commutated pole converter is investigated experimentally for converter based utility devices. Converter performance is evaluated at high power and the results are compared with hard switched converter technology.
{"title":"Performance of the auxiliary resonant commutated pole converter in converter based utility devices","authors":"H. J. Beukes, J. Enslin, R. Spée","doi":"10.1109/PESC.1996.548709","DOIUrl":"https://doi.org/10.1109/PESC.1996.548709","url":null,"abstract":"In this paper the performance of the auxiliary resonant commutated pole converter is investigated experimentally for converter based utility devices. Converter performance is evaluated at high power and the results are compared with hard switched converter technology.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"54 1","pages":"1033-1039 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73489216","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 : 1996-06-23DOI: 10.1109/PESC.1996.548631
N. Raju, S. Venkata, V. Sastry
This paper presents a new power converter topology for the series VAr compensation of AC power systems. The scheme employs a multi-step inverter for compensation at fundamental frequency and a PWM inverter for harmonic compensation. The inverters are decoupled in such a manner that the high-frequency harmonic compensation module uses an inverter of low power rating, while the slow-switching fundamental frequency compensation module supports most of the stresses. This decoupled topology is expected to result in a significant reduction in cost and losses associated with active VAr compensators for high-power applications. The principle of operation along with the control strategy are described. Simulation results are presented to demonstrate the performance of the proposed system.
{"title":"A decoupled series compensator for voltage regulation and harmonic compensation","authors":"N. Raju, S. Venkata, V. Sastry","doi":"10.1109/PESC.1996.548631","DOIUrl":"https://doi.org/10.1109/PESC.1996.548631","url":null,"abstract":"This paper presents a new power converter topology for the series VAr compensation of AC power systems. The scheme employs a multi-step inverter for compensation at fundamental frequency and a PWM inverter for harmonic compensation. The inverters are decoupled in such a manner that the high-frequency harmonic compensation module uses an inverter of low power rating, while the slow-switching fundamental frequency compensation module supports most of the stresses. This decoupled topology is expected to result in a significant reduction in cost and losses associated with active VAr compensators for high-power applications. The principle of operation along with the control strategy are described. Simulation results are presented to demonstrate the performance of the proposed system.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"234 1","pages":"527-531 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73511898","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 : 1996-06-23DOI: 10.1109/PESC.1996.548832
A. Stanković
This paper describes a controller design methodology for series resonant DC/DC power converters. The control goal is to maintain the output voltage in the presence of large load perturbations by varying the switching frequency. This methodology utilizes large-scale, nonlinear switched and generalized averaged models and the resulting closed-loop system is exponentially convergent under typical operating conditions. The designer has a direct handle over the convergence rate, and the nonlinear controller requires only the usual output voltage measurements while the load variations are estimated. When compared to fixed, robust linear compensators, the performance is greatly improved as the duration of a transient is decreased more than an order of magnitude, while size of the output voltage excursion is less than half of the one typically achievable with linear compensators. The nonlinear compensator is fairly simple, as it comprises a static nonlinearity, a saturable integrator, and a few linear and logic elements.
{"title":"A dissipativity-based controller for series resonant DC/DC converters","authors":"A. Stanković","doi":"10.1109/PESC.1996.548832","DOIUrl":"https://doi.org/10.1109/PESC.1996.548832","url":null,"abstract":"This paper describes a controller design methodology for series resonant DC/DC power converters. The control goal is to maintain the output voltage in the presence of large load perturbations by varying the switching frequency. This methodology utilizes large-scale, nonlinear switched and generalized averaged models and the resulting closed-loop system is exponentially convergent under typical operating conditions. The designer has a direct handle over the convergence rate, and the nonlinear controller requires only the usual output voltage measurements while the load variations are estimated. When compared to fixed, robust linear compensators, the performance is greatly improved as the duration of a transient is decreased more than an order of magnitude, while size of the output voltage excursion is less than half of the one typically achievable with linear compensators. The nonlinear compensator is fairly simple, as it comprises a static nonlinearity, a saturable integrator, and a few linear and logic elements.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"24 1","pages":"1844-1849 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78108686","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 : 1996-06-23DOI: 10.1109/PESC.1996.548654
M. Cipolla Ficarra, J.M. Moreno Eguilaz, J. Peracaula
A fuzzy logic speed controller together with a dead-time compensator for the control of a high-performance induction motor drive is presented. The proposed method consists of two parts: one used to reduce the effects of load variations and the other to minimize the effects of system dead-time. A Smith predictor in conjunction with a fuzzy logic gain scheduled PI controller is compared with a classic fixed-gain PI control structure.
{"title":"Fuzzy control of an induction motor with compensation of system dead-time","authors":"M. Cipolla Ficarra, J.M. Moreno Eguilaz, J. Peracaula","doi":"10.1109/PESC.1996.548654","DOIUrl":"https://doi.org/10.1109/PESC.1996.548654","url":null,"abstract":"A fuzzy logic speed controller together with a dead-time compensator for the control of a high-performance induction motor drive is presented. The proposed method consists of two parts: one used to reduce the effects of load variations and the other to minimize the effects of system dead-time. A Smith predictor in conjunction with a fuzzy logic gain scheduled PI controller is compared with a classic fixed-gain PI control structure.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"7 1","pages":"677-681 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78262563","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 : 1996-06-23DOI: 10.1109/PESC.1996.548782
P. Donoso Garcia, P. Cortizo, B.R. de Menezes, M. Severo Mendes
This paper presents a novel control scheme for current distribution in parallel connected DC-to-DC converters. It uses a sliding-mode controller (SMC) to achieve both output current equalization and output voltage regulation. The controller improves the dynamic performance of a parallel buck converter: the output voltage is robust against load disturbances and the output currents are very well equalized. An analysis and design of the sliding mode controller is developed. Simulation and experimental results are presented, showing a good dynamic performance of the control scheme proposed.
{"title":"Sliding mode control for current distribution in DC-to-DC converters connected in parallel","authors":"P. Donoso Garcia, P. Cortizo, B.R. de Menezes, M. Severo Mendes","doi":"10.1109/PESC.1996.548782","DOIUrl":"https://doi.org/10.1109/PESC.1996.548782","url":null,"abstract":"This paper presents a novel control scheme for current distribution in parallel connected DC-to-DC converters. It uses a sliding-mode controller (SMC) to achieve both output current equalization and output voltage regulation. The controller improves the dynamic performance of a parallel buck converter: the output voltage is robust against load disturbances and the output currents are very well equalized. An analysis and design of the sliding mode controller is developed. Simulation and experimental results are presented, showing a good dynamic performance of the control scheme proposed.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"32 1","pages":"1513-1518 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78275675","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 : 1996-06-23DOI: 10.1109/PESC.1996.548775
A. Kislovski
An analytical approximation for the relative incremental permeability of soft ferrites as a function of the magnetic field H is proposed. The numerical values of the parameters of the approximation are given for several current materials. Experiments confirming its validity are reported. The approximation is useful in design of nonlinear magnetic components and in analysis of circuits using them.
{"title":"Relative incremental permeability of soft ferrites as a function of the magnetic field H: an analytic approximation","authors":"A. Kislovski","doi":"10.1109/PESC.1996.548775","DOIUrl":"https://doi.org/10.1109/PESC.1996.548775","url":null,"abstract":"An analytical approximation for the relative incremental permeability of soft ferrites as a function of the magnetic field H is proposed. The numerical values of the parameters of the approximation are given for several current materials. Experiments confirming its validity are reported. The approximation is useful in design of nonlinear magnetic components and in analysis of circuits using them.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"2 1","pages":"1469-1475 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77864296","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 : 1996-06-23DOI: 10.1109/PESC.1996.548716
V. Thottuvelil, G. Verghese
A method for assessing the small-signal stability of paralleled converters with active current sharing is derived. The method is general and can be applied to systems with any number of converters. For identical converters, the method results in a particularly simple stability criterion. Illustrative examples show application of the analysis method. Design considerations for using the method are also provided.
{"title":"Stability analysis of paralleled DC/DC converters with active current sharing","authors":"V. Thottuvelil, G. Verghese","doi":"10.1109/PESC.1996.548716","DOIUrl":"https://doi.org/10.1109/PESC.1996.548716","url":null,"abstract":"A method for assessing the small-signal stability of paralleled converters with active current sharing is derived. The method is general and can be applied to systems with any number of converters. For identical converters, the method results in a particularly simple stability criterion. Illustrative examples show application of the analysis method. Design considerations for using the method are also provided.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"64 1","pages":"1080-1086 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77932626","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 : 1996-06-23DOI: 10.1109/PESC.1996.548813
N. Langovsky, M. Elbuluk, M. D. Kankam
This paper revisits a discrete form of a bilateral switch that is used in AC resonant link power converters (ACRLCs). The active power device used is the MOS-controlled thyristor (MCT). The switch topology offers high levels of component integration, and increases the modular design of ACRLCs. However, the topology can cause problems due to the nonidealities of the solid-state devices. A simple solution to these problems is presented in the form of a switching sequence that allows all switches to theoretically commutate current at zero-voltage. Also, the proposed sequencing of the devices eliminates the need for snubber components. Simulation and experimental results are presented and discussed.
{"title":"Optimized switching sequence for snubberless operation of bilateral MCT switches in AC resonant link converters","authors":"N. Langovsky, M. Elbuluk, M. D. Kankam","doi":"10.1109/PESC.1996.548813","DOIUrl":"https://doi.org/10.1109/PESC.1996.548813","url":null,"abstract":"This paper revisits a discrete form of a bilateral switch that is used in AC resonant link power converters (ACRLCs). The active power device used is the MOS-controlled thyristor (MCT). The switch topology offers high levels of component integration, and increases the modular design of ACRLCs. However, the topology can cause problems due to the nonidealities of the solid-state devices. A simple solution to these problems is presented in the form of a switching sequence that allows all switches to theoretically commutate current at zero-voltage. Also, the proposed sequencing of the devices eliminates the need for snubber components. Simulation and experimental results are presented and discussed.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"25 1","pages":"1724-1730 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77999678","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 : 1996-06-23DOI: 10.1109/PESC.1996.548795
K. Shinoda, M. Fujii, M. Matsuo, T. Suetsugu, S. Mori
This paper presents the analysis and experimental results of the phase-controlled resonant DC/AC inverter with Class E frequency multipliers. This inverter can regulate the output voltage against line and load variations at a fixed operating frequency. The measured efficiency was over 91% at an output power of 0.87 W and an output frequency of 1.0 MHz using frequency doublers.
{"title":"Analysis of phase-controlled resonant DC/AC inverter with Class E frequency multipliers","authors":"K. Shinoda, M. Fujii, M. Matsuo, T. Suetsugu, S. Mori","doi":"10.1109/PESC.1996.548795","DOIUrl":"https://doi.org/10.1109/PESC.1996.548795","url":null,"abstract":"This paper presents the analysis and experimental results of the phase-controlled resonant DC/AC inverter with Class E frequency multipliers. This inverter can regulate the output voltage against line and load variations at a fixed operating frequency. The measured efficiency was over 91% at an output power of 0.87 W and an output frequency of 1.0 MHz using frequency doublers.","PeriodicalId":19979,"journal":{"name":"PESC Record. 27th Annual IEEE Power Electronics Specialists Conference","volume":"317 1","pages":"1601-1606 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1996-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75003009","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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