Pub Date : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778408
P. Cortes, José R. Rodríguez, D. Quevedo, César A. Silva
A modified predictive current control strategy is presented in order to have control over the spectrum of the load current. The proposed strategy uses a model of the system to predict the behavior of the current for each possible voltage vector generated by the inverter. For that purpose, at each sampling interval, signal predictions are evaluated using a cost function that quantifies the desired system behavior. The cost function used in this work evaluates the filtered error of the load currents. The inclusion of a filter for the load error allows one to manipulate current spectra. Thus, by designing this filter appropriately, the load spectrum can be shaped.
{"title":"Predictive Current Control Strategy with Imposed Load Current Spectrum","authors":"P. Cortes, José R. Rodríguez, D. Quevedo, César A. Silva","doi":"10.1109/EPEPEMC.2006.4778408","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778408","url":null,"abstract":"A modified predictive current control strategy is presented in order to have control over the spectrum of the load current. The proposed strategy uses a model of the system to predict the behavior of the current for each possible voltage vector generated by the inverter. For that purpose, at each sampling interval, signal predictions are evaluated using a cost function that quantifies the desired system behavior. The cost function used in this work evaluates the filtered error of the load currents. The inclusion of a filter for the load error allows one to manipulate current spectra. Thus, by designing this filter appropriately, the load spectrum can be shaped.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130179364","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778519
Shan Xue, X. Wen, Zhao Feng
Multiphase motor drives are multi-dimensional systems, so multiphase SVPWM must be implemented in a multi-dimensional vector space to satisfy motor's control requirements. In this paper, a novel multi-dimensional multiphase SVPWM strategy, which could synthesize the required voltage vectors not only in d-q subspace but also in other subspaces, is presented. Therefore, this strategy can control all voltage and current harmonics which contribute to the torque positively. Throughout this paper, a five-phase permanent motor drive system is developed as an example, and simulation and experimental results verify the validity of the proposed method. For the purpose of comparison, conventional SVPWM is also tested.
{"title":"A Novel Multi-Dimensional SVPWM Strategy of Multiphase Motor Drives","authors":"Shan Xue, X. Wen, Zhao Feng","doi":"10.1109/EPEPEMC.2006.4778519","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778519","url":null,"abstract":"Multiphase motor drives are multi-dimensional systems, so multiphase SVPWM must be implemented in a multi-dimensional vector space to satisfy motor's control requirements. In this paper, a novel multi-dimensional multiphase SVPWM strategy, which could synthesize the required voltage vectors not only in d-q subspace but also in other subspaces, is presented. Therefore, this strategy can control all voltage and current harmonics which contribute to the torque positively. Throughout this paper, a five-phase permanent motor drive system is developed as an example, and simulation and experimental results verify the validity of the proposed method. For the purpose of comparison, conventional SVPWM is also tested.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131142620","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778503
G. Grandi, G. Serra, A. Tani
In this paper the space vector approach is applied to the analysis of multi-phase electric systems. This approach builds on an existing but non systematic knowledge base, partially available in literature. In particular, power and RMS are expressed in terms of space vectors, and a comparison is carried out with respect to the Fortescue's symmetrical components in the case of n-phase circuits with sinusoidal waveforms. The use of space vectors allows real time analysis and regulation of both multi-phase converters and multi-phase machines with an elegant and effective vectorial approach.
{"title":"General Analysis of Multi-Phase Systems Based on Space Vector Approach","authors":"G. Grandi, G. Serra, A. Tani","doi":"10.1109/EPEPEMC.2006.4778503","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778503","url":null,"abstract":"In this paper the space vector approach is applied to the analysis of multi-phase electric systems. This approach builds on an existing but non systematic knowledge base, partially available in literature. In particular, power and RMS are expressed in terms of space vectors, and a comparison is carried out with respect to the Fortescue's symmetrical components in the case of n-phase circuits with sinusoidal waveforms. The use of space vectors allows real time analysis and regulation of both multi-phase converters and multi-phase machines with an elegant and effective vectorial approach.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130845697","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778406
V. Oleschuk, F. Profumo, A. Tenconi, A. Stankovic
Novel method of synchronous pulsewidth modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single dc voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave symmetry during the whole control range including the zone of overmodulation, and its spectra do not contain even harmonics and sub-harmonics (combined harmonics). Simulations give the behaviour of the proposed methods of synchronous PWM in these systems. Continuous, discontinuous and "direct-direct" schemes of synchronous PWM, applied for control of cascaded three-level converters, have been analysed and compared.
{"title":"Synchronous Control of Cascaded Three-Level Inverters","authors":"V. Oleschuk, F. Profumo, A. Tenconi, A. Stankovic","doi":"10.1109/EPEPEMC.2006.4778406","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778406","url":null,"abstract":"Novel method of synchronous pulsewidth modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single dc voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave symmetry during the whole control range including the zone of overmodulation, and its spectra do not contain even harmonics and sub-harmonics (combined harmonics). Simulations give the behaviour of the proposed methods of synchronous PWM in these systems. Continuous, discontinuous and \"direct-direct\" schemes of synchronous PWM, applied for control of cascaded three-level converters, have been analysed and compared.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124293207","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778458
G. Iwański, W. Koczara
A stand alone power generation system with doubly fed induction generator and its control method is presented in the paper. A slip-ring induction generator is equipped with the stator connected capacitances for filtering the switching frequency harmonics produced by the rotor connected power electronics converter. The proposed direct voltage control method, based on the stator voltage vector reference, provides fixed frequency and amplitude of the generated stator voltage operation. Different types of load (linear nonlinear) can be supplied keeping high quality voltage. A star connected stator provides the four wires system, supplying a single phase or unbalanced load. However the high load asymmetry produces the unbalanced stator voltage and in this case the additional part of the voltage control method is necessary for voltage asymmetry correction. As the main part of the control method bases of the positive sequence component of the stator voltage vector, the asymmetry correction algorithm bases on the negative sequence components. To extract both positive and negative sequence components of the stator voltage vector, two independent rotating frames are used. The coordinates systems rotates in opposite directions with synchronous and counter to synchronous angular speed. A PSIM software is used for control method design and prototyping. A proposed stand alone power generation system was build and tested. The developed stator voltage control with voltage asymmetry algorithm is proved by simulations and by oscillograms from laboratory tests
{"title":"Positive and Negative Sequence based Sensorless Control for Stand-Alone Slip-Ring Generator","authors":"G. Iwański, W. Koczara","doi":"10.1109/EPEPEMC.2006.4778458","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778458","url":null,"abstract":"A stand alone power generation system with doubly fed induction generator and its control method is presented in the paper. A slip-ring induction generator is equipped with the stator connected capacitances for filtering the switching frequency harmonics produced by the rotor connected power electronics converter. The proposed direct voltage control method, based on the stator voltage vector reference, provides fixed frequency and amplitude of the generated stator voltage operation. Different types of load (linear nonlinear) can be supplied keeping high quality voltage. A star connected stator provides the four wires system, supplying a single phase or unbalanced load. However the high load asymmetry produces the unbalanced stator voltage and in this case the additional part of the voltage control method is necessary for voltage asymmetry correction. As the main part of the control method bases of the positive sequence component of the stator voltage vector, the asymmetry correction algorithm bases on the negative sequence components. To extract both positive and negative sequence components of the stator voltage vector, two independent rotating frames are used. The coordinates systems rotates in opposite directions with synchronous and counter to synchronous angular speed. A PSIM software is used for control method design and prototyping. A proposed stand alone power generation system was build and tested. The developed stator voltage control with voltage asymmetry algorithm is proved by simulations and by oscillograms from laboratory tests","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117114568","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778602
J. A. Barrado, R. Griñó
This work proposes a system, based on a self-excited induction generator (SEIG) with a shunt electronic converter, to feed isolated three-phase and single-phase linear or nonlinear loads. The electronic converter is composed by a three-phase four-wire shunt active filter and a DC chopper attached to its DC bus. The converter compensates the current harmonics, the reactive power and the load unbalances at its AC side and dissipates the active power excess through the chopper at its DC side. The designed control architecture assures that, in steady state, the rms values of the voltages and the frequency remain at the their reference values. The simulated results show a good performance of the system under different loading conditions
{"title":"Voltage and Frequency Control for a Self-Excited Induction Generator Using a Three-Phase Four-Wire Electronic Converter","authors":"J. A. Barrado, R. Griñó","doi":"10.1109/EPEPEMC.2006.4778602","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778602","url":null,"abstract":"This work proposes a system, based on a self-excited induction generator (SEIG) with a shunt electronic converter, to feed isolated three-phase and single-phase linear or nonlinear loads. The electronic converter is composed by a three-phase four-wire shunt active filter and a DC chopper attached to its DC bus. The converter compensates the current harmonics, the reactive power and the load unbalances at its AC side and dissipates the active power excess through the chopper at its DC side. The designed control architecture assures that, in steady state, the rms values of the voltages and the frequency remain at the their reference values. The simulated results show a good performance of the system under different loading conditions","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125797963","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778443
Hung-I Hsieh, T. Lin, Dan Y. Chen
In a two-wire (no chassis ground) input off-line power supply system, a capacitor is often connected between the primary and the secondary side of the transformer for common-mode EMI reduction. For a three-wire off-line power supplies, such a capacitor, is also used sometime for the same purpose. It's unclear how this capacitor works. In this paper, explanation of the noise suppression mechanism and effectiveness of such a capacitor is given. From the understanding of the mechanism, suggestions were made for the use of such a capacitor and output inductor placement to avoid the pitfalls and achieve desirable effects.
{"title":"Use of a Cz Common-Mode Capacitor in 2-wire and 3-wire Off-line Power Supplies","authors":"Hung-I Hsieh, T. Lin, Dan Y. Chen","doi":"10.1109/EPEPEMC.2006.4778443","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778443","url":null,"abstract":"In a two-wire (no chassis ground) input off-line power supply system, a capacitor is often connected between the primary and the secondary side of the transformer for common-mode EMI reduction. For a three-wire off-line power supplies, such a capacitor, is also used sometime for the same purpose. It's unclear how this capacitor works. In this paper, explanation of the noise suppression mechanism and effectiveness of such a capacitor is given. From the understanding of the mechanism, suggestions were made for the use of such a capacitor and output inductor placement to avoid the pitfalls and achieve desirable effects.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126001259","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778384
M. Stadler, J. Pforr
This paper presents results of the analysis and design of a multi-phase buck converter with integrated filter inductor when operated with a wide range of voltage conversion ratios. Included are the analysis of the converter input and output currents to optimize the required filter capacitors, the analysis and design of the integrated filter inductor and results of a state-space controller that provides robust control of the output voltage for the required wide range of input voltages and loads ranging from full to no-load conditions. The influence of the wide range of input voltages to the operation of the converter is demonstrated. A prototype converter with four phases and an integrated filter inductor has been built and tested to verify predictions from the analysis.
{"title":"Multi-phase Converter for Wide Range of Input Voltages with Integrated Filter Inductor","authors":"M. Stadler, J. Pforr","doi":"10.1109/EPEPEMC.2006.4778384","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778384","url":null,"abstract":"This paper presents results of the analysis and design of a multi-phase buck converter with integrated filter inductor when operated with a wide range of voltage conversion ratios. Included are the analysis of the converter input and output currents to optimize the required filter capacitors, the analysis and design of the integrated filter inductor and results of a state-space controller that provides robust control of the output voltage for the required wide range of input voltages and loads ranging from full to no-load conditions. The influence of the wide range of input voltages to the operation of the converter is demonstrated. A prototype converter with four phases and an integrated filter inductor has been built and tested to verify predictions from the analysis.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570350","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778470
Yanshen Hu, Yunxiang Xie, Huamin Xu, Hao Tian
A novel integrated magnetic structure, which enables further reduction in an overall volume and weight of main inductors, the losses of the inductor windings and the channels by integrating the inductors in a single core, is proposed, for the telecom power application, and the operations and practical design considerations of the DC/DC boost converters using interleaved two-channel with CCM operation are investigated with common ¿-model.
{"title":"Design and Implementation of Two-Channel Interleaved Boost Converters with Integrated Coupling Inductors","authors":"Yanshen Hu, Yunxiang Xie, Huamin Xu, Hao Tian","doi":"10.1109/EPEPEMC.2006.4778470","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778470","url":null,"abstract":"A novel integrated magnetic structure, which enables further reduction in an overall volume and weight of main inductors, the losses of the inductor windings and the channels by integrating the inductors in a single core, is proposed, for the telecom power application, and the operations and practical design considerations of the DC/DC boost converters using interleaved two-channel with CCM operation are investigated with common ¿-model.","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127097354","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 : 2006-08-01DOI: 10.1109/EPEPEMC.2006.4778439
Z. Gao, T. Habetler, R. Harley, R. S. Colby
This paper proposes a sensorless rotor temperature estimator for small to medium size mains-fed induction machines. With measurements obtained from only current and voltage sensors, the proposed estimator can capture the rotor temperature in an online fashion. First the rotor speed is extracted from the current harmonic spectrum based on the estimated rotor slot and eccentricity harmonic frequencies. Then the inductances are estimated from the induction machine equivalent circuit. The stator winding resistance at ambient temperature is the only motor parameter needed at this stage. Once the inductances are obtained, they are fed into the rotor resistance estimation algorithm to yield an estimate of the rotor resistance. Finally the rotor temperature is calculated from the linear relationship between temperature and rotor resistance. Experimental results from different motors are shown to validate the proposed scheme. The whole scheme is accurate and reliable and is therefore suitable to be implemented in a rotor thermal protection relay or a motor drive employing vector control scheme to compensate for the detuning effects
{"title":"A Sensorless Rotor Temperature Estimator for Induction Machines Based on Current Harmonic Spectral Estimation Scheme","authors":"Z. Gao, T. Habetler, R. Harley, R. S. Colby","doi":"10.1109/EPEPEMC.2006.4778439","DOIUrl":"https://doi.org/10.1109/EPEPEMC.2006.4778439","url":null,"abstract":"This paper proposes a sensorless rotor temperature estimator for small to medium size mains-fed induction machines. With measurements obtained from only current and voltage sensors, the proposed estimator can capture the rotor temperature in an online fashion. First the rotor speed is extracted from the current harmonic spectrum based on the estimated rotor slot and eccentricity harmonic frequencies. Then the inductances are estimated from the induction machine equivalent circuit. The stator winding resistance at ambient temperature is the only motor parameter needed at this stage. Once the inductances are obtained, they are fed into the rotor resistance estimation algorithm to yield an estimate of the rotor resistance. Finally the rotor temperature is calculated from the linear relationship between temperature and rotor resistance. Experimental results from different motors are shown to validate the proposed scheme. The whole scheme is accurate and reliable and is therefore suitable to be implemented in a rotor thermal protection relay or a motor drive employing vector control scheme to compensate for the detuning effects","PeriodicalId":401288,"journal":{"name":"2006 12th International Power Electronics and Motion Control Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121617883","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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