Pub Date : 2014-09-29DOI: 10.1109/EPE.2014.6910799
Llorenc Taus Beti, U. Schafer
This report presents an algorithm for reference current calculation to minimize losses in electric vehicles with PMSM. The algorithm calculates the current set points explicitly through analytical expressions depending on the requested torque, the speed of the drive and the available DC voltage. The required machine parameters have been gathered from experimental data.
{"title":"Loss minimization algorithm of an IPMSM based on analytical expressions","authors":"Llorenc Taus Beti, U. Schafer","doi":"10.1109/EPE.2014.6910799","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910799","url":null,"abstract":"This report presents an algorithm for reference current calculation to minimize losses in electric vehicles with PMSM. The algorithm calculates the current set points explicitly through analytical expressions depending on the requested torque, the speed of the drive and the available DC voltage. The required machine parameters have been gathered from experimental data.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"23 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89497142","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910900
M. Iacchetti, G. Marques
This paper considers the control of a doubly fed induction machine (DFIG) connected to a dc-bus or dc-grid by using a diode rectifier placed on the stator-side and a single PWM converter on the rotor. In this system, the torque and the frequency have to be regulated simultaneously, in order to make the prime mover operating at the maximum power point and to guarantee at the same time a flux level near the rated value. Since this system is based on a unique reduced-power controlled converter and a diode rectifier, a noticeable reduction of the costs of the power electronics can be achieved. However, the diode bridge causes stator current and voltage harmonics which produce a noticeable torque ripple. A regulation scheme able to reduce the torque ripple is proposed in this paper: resonant current controllers are implemented to track the sixth harmonic components in the reference rotor current commands, in such a way to kill the corresponding harmonic in the electromagnetic torque.
{"title":"Enhanced torque control in a DFIG connected to a DC grid by a diode rectifier","authors":"M. Iacchetti, G. Marques","doi":"10.1109/EPE.2014.6910900","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910900","url":null,"abstract":"This paper considers the control of a doubly fed induction machine (DFIG) connected to a dc-bus or dc-grid by using a diode rectifier placed on the stator-side and a single PWM converter on the rotor. In this system, the torque and the frequency have to be regulated simultaneously, in order to make the prime mover operating at the maximum power point and to guarantee at the same time a flux level near the rated value. Since this system is based on a unique reduced-power controlled converter and a diode rectifier, a noticeable reduction of the costs of the power electronics can be achieved. However, the diode bridge causes stator current and voltage harmonics which produce a noticeable torque ripple. A regulation scheme able to reduce the torque ripple is proposed in this paper: resonant current controllers are implemented to track the sixth harmonic components in the reference rotor current commands, in such a way to kill the corresponding harmonic in the electromagnetic torque.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"38 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89576936","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910709
K. Leong, A. Muetze
This paper proposes a buck type PFC which is based on a new bridgeless inverted buck-boost circuit. The circuit can achieve ZVS for the full range via triangular current mode (TCM) and unlike conventional buck PFC, the circuit can operate for the entire cycle. The bridgeless topology has fewer numbers of components in the conduction path than any other bridgeless boost PFC circuits. The ideal full control is discussed and a simplified control is also proposed which has almost the same efficiency with a simulated peak value of ~97.5%. This circuit also exhibits an interesting property of higher efficiencies at low load conditions which could be of interest for SMPS for laptops and computers.
{"title":"An analysis into bridgeless inverted buck-boost PFC with ZVS capabilities","authors":"K. Leong, A. Muetze","doi":"10.1109/EPE.2014.6910709","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910709","url":null,"abstract":"This paper proposes a buck type PFC which is based on a new bridgeless inverted buck-boost circuit. The circuit can achieve ZVS for the full range via triangular current mode (TCM) and unlike conventional buck PFC, the circuit can operate for the entire cycle. The bridgeless topology has fewer numbers of components in the conduction path than any other bridgeless boost PFC circuits. The ideal full control is discussed and a simplified control is also proposed which has almost the same efficiency with a simulated peak value of ~97.5%. This circuit also exhibits an interesting property of higher efficiencies at low load conditions which could be of interest for SMPS for laptops and computers.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"65 5 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89279769","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 : 2014-09-29DOI: 10.1109/EPE.2014.6911010
Lin Qiu, Lie Xu, Yongdong Li
The matrix converter (MC) is an array of controlled bidirectional semi-conductor switches that allows direct ac-ac conversion without an intermediate dc link. To extend its future application, multilevel matrix converter can be a proposed solution due to its merits in multilevel output, high voltage application, high power conversion, improved harmonics issue and less voltage step, etc. This paper presents an improved voltage balancing control using utility function on a capacitor-clamped multilevel matrix converter; the improved modulation strategy based on amplitude coefficient is employed to improve the performance in terms of modulation precision. Simulations and experimental results from a small-scale experimental prototype are presented to validate the theoretical findings.
{"title":"Voltage balancing control of AC-capacitor clamped multi-level matrix converter based on optimal switching status selection","authors":"Lin Qiu, Lie Xu, Yongdong Li","doi":"10.1109/EPE.2014.6911010","DOIUrl":"https://doi.org/10.1109/EPE.2014.6911010","url":null,"abstract":"The matrix converter (MC) is an array of controlled bidirectional semi-conductor switches that allows direct ac-ac conversion without an intermediate dc link. To extend its future application, multilevel matrix converter can be a proposed solution due to its merits in multilevel output, high voltage application, high power conversion, improved harmonics issue and less voltage step, etc. This paper presents an improved voltage balancing control using utility function on a capacitor-clamped multilevel matrix converter; the improved modulation strategy based on amplitude coefficient is employed to improve the performance in terms of modulation precision. Simulations and experimental results from a small-scale experimental prototype are presented to validate the theoretical findings.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"51 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87966688","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910898
M. Schulz
The major factor defining the wear and tear in power electronic components is temperature swing. The paper presents an insight to failure mechanisms and the benefits that can be gained if a holistic approach considering devices, adequate design-in and advanced thermal management is considered.
{"title":"Thermal management details and their influence on the aging of power semiconductors","authors":"M. Schulz","doi":"10.1109/EPE.2014.6910898","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910898","url":null,"abstract":"The major factor defining the wear and tear in power electronic components is temperature swing. The paper presents an insight to failure mechanisms and the benefits that can be gained if a holistic approach considering devices, adequate design-in and advanced thermal management is considered.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"52 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85800930","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910912
Chunfang Zheng, X. Xu, Bo Zhang, D. Qiu
This paper presents the principle and implementation of the wavelet PWM (WPWM) technique based on dyadic-type multi-resolution analyses (MRAs) for single-phase inverters, analyzes and gives the inverter's output features at different parameters based on WPWM technique, which is beneficial to choose suitable parameters. Finally, according to the harmonic eliminating principle, compares WPWM with SPWM technique by some specific examples. The calculation and simulation results show that WPWM can get simpler realization by digital algorithm, higher fundamental component magnitudes and lower THD factors, but the range of fundamental component magnitude is smaller and the ability of eliminating lower harmonics is worse, which provide theoretical basis for the application of the WPWM efficiently in practice.
{"title":"Inverter's characteristic analysis under different parameters of wavelet PWM technique","authors":"Chunfang Zheng, X. Xu, Bo Zhang, D. Qiu","doi":"10.1109/EPE.2014.6910912","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910912","url":null,"abstract":"This paper presents the principle and implementation of the wavelet PWM (WPWM) technique based on dyadic-type multi-resolution analyses (MRAs) for single-phase inverters, analyzes and gives the inverter's output features at different parameters based on WPWM technique, which is beneficial to choose suitable parameters. Finally, according to the harmonic eliminating principle, compares WPWM with SPWM technique by some specific examples. The calculation and simulation results show that WPWM can get simpler realization by digital algorithm, higher fundamental component magnitudes and lower THD factors, but the range of fundamental component magnitude is smaller and the ability of eliminating lower harmonics is worse, which provide theoretical basis for the application of the WPWM efficiently in practice.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"123 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86667957","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 : 2014-09-29DOI: 10.1109/EPE.2014.6911034
Tomáš Bedrník, Jan Kraus, L. Kukačka
The article touches the topic of processing the measurements of high frequency harmonics in power grids (above 2 kHz). Measurements in wider band do produce large volumes of data. But often not all of these need to be stored in their raw form for further analysis. This article discusses some adaptable possibilities of reducing the amount of data and proposes an intelligent magnitude-oriented scheme of grouping harmonics instead of the one defined in current standards.
{"title":"Magnitude oriented intelligent grouping scheme for harmonics above 2 kHz","authors":"Tomáš Bedrník, Jan Kraus, L. Kukačka","doi":"10.1109/EPE.2014.6911034","DOIUrl":"https://doi.org/10.1109/EPE.2014.6911034","url":null,"abstract":"The article touches the topic of processing the measurements of high frequency harmonics in power grids (above 2 kHz). Measurements in wider band do produce large volumes of data. But often not all of these need to be stored in their raw form for further analysis. This article discusses some adaptable possibilities of reducing the amount of data and proposes an intelligent magnitude-oriented scheme of grouping harmonics instead of the one defined in current standards.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"10 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87395875","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910881
G. Torrisi, S. Mariéthoz, Roy Smith
Precise estimation of flux and accurate modeling are of paramount importance for improving control performance in induction machines. Non-linearities limit the performance of control techniques, which in general assume linearity of the components. The paper proposes a procedure to identify magnetic saturation and hysteresis losses, which uses the available current and voltage measurements from the inverter and is based on the Jiles-Atherton theory. The theoretical achievements are tested on an experimental test rig, showing practical feasibility of the method.
{"title":"Identification of magnetic characteristics of induction motors based on the Jiles-Atherton model","authors":"G. Torrisi, S. Mariéthoz, Roy Smith","doi":"10.1109/EPE.2014.6910881","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910881","url":null,"abstract":"Precise estimation of flux and accurate modeling are of paramount importance for improving control performance in induction machines. Non-linearities limit the performance of control techniques, which in general assume linearity of the components. The paper proposes a procedure to identify magnetic saturation and hysteresis losses, which uses the available current and voltage measurements from the inverter and is based on the Jiles-Atherton theory. The theoretical achievements are tested on an experimental test rig, showing practical feasibility of the method.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"11 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78604180","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910859
M. Kasper, Stefan Herden, D. Bortis, J. Kolar
Unequal irradiance of series connected PV panels in a string strongly decreases the output power of the PV system, as either PV panels are bypassed or operated below their MPP. By connecting balancing converters around each pair of adjacent PV panels, all panels can maintain the operation close to their MPP regardless of any mismatched operating condition. In this paper a balancing converter concept with ZVS is introduced and the operation of a string of PV panels equipped with balancing converters is analytically described. Based on this analytic framework, different examples of shading scenarios of a PV string are examined regarding the average inductor current values that occur within the balancing modules, in order to derive the required specifications of a balancing converter. Moreover, a two-level overcurrent protection concept is introduced which enables to keep all balancing converters within the safe operating area at all times, even at shading conditions with high mismatch. Furthermore, the design optimization of a highly efficient PV voltage balancing converter with a wide input voltage range is explained in detail and finally the concept is verified with measurement results of a demonstrator system.
{"title":"Impact of PV string shading conditions on panel voltage equalizing converters and optimization of a single converter system with overcurrent protection","authors":"M. Kasper, Stefan Herden, D. Bortis, J. Kolar","doi":"10.1109/EPE.2014.6910859","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910859","url":null,"abstract":"Unequal irradiance of series connected PV panels in a string strongly decreases the output power of the PV system, as either PV panels are bypassed or operated below their MPP. By connecting balancing converters around each pair of adjacent PV panels, all panels can maintain the operation close to their MPP regardless of any mismatched operating condition. In this paper a balancing converter concept with ZVS is introduced and the operation of a string of PV panels equipped with balancing converters is analytically described. Based on this analytic framework, different examples of shading scenarios of a PV string are examined regarding the average inductor current values that occur within the balancing modules, in order to derive the required specifications of a balancing converter. Moreover, a two-level overcurrent protection concept is introduced which enables to keep all balancing converters within the safe operating area at all times, even at shading conditions with high mismatch. Furthermore, the design optimization of a highly efficient PV voltage balancing converter with a wide input voltage range is explained in detail and finally the concept is verified with measurement results of a demonstrator system.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"30 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81242998","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910901
A. Joannou, D. Pentz, J. D. van Wyk, A. D. de Beer
Power semi-conductors are able to achieve switching transients within a few nanoseconds and possibly even faster. These fast switching transients will need to be measured and analyzed thoroughly. In this paper four different types of shunt constructions and installations are tested on the same power electronics circuit, giving widely diverse results. Interpreting and analyzing these measurement results will assist in developing accurate current measurement devices for fast switching transient power electronic converters of the future.
{"title":"Some considerations for miniaturized measurement shunts in high frequency power electronic converters","authors":"A. Joannou, D. Pentz, J. D. van Wyk, A. D. de Beer","doi":"10.1109/EPE.2014.6910901","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910901","url":null,"abstract":"Power semi-conductors are able to achieve switching transients within a few nanoseconds and possibly even faster. These fast switching transients will need to be measured and analyzed thoroughly. In this paper four different types of shunt constructions and installations are tested on the same power electronics circuit, giving widely diverse results. Interpreting and analyzing these measurement results will assist in developing accurate current measurement devices for fast switching transient power electronic converters of the future.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"26 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86089089","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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