Pub Date : 2016-09-01DOI: 10.1109/EPE.2016.7695645
M. Putz, P. Blau, A. Kolesnikov, M. Richter, A. Pierer
The development approach for energy storage systems focuses on optimally sized capacitor modules to reduce peak power and to avoid energy recovery of production machines. Using servo presses as an example, the application of two different energy storage systems in the DC link is practically examined. A simulation model in Matlab/Simulink and a test stand of a servo press are proposed for representing the power flows between the mains supply, the electric drives and the storage systems. The description of forming machines and the behaviour of the electric components are used to control the amount of stored energy in a storage system and to influence the process regarding a reduction of peak power.
{"title":"Energy storage in drive systems of servo presses for reduction of peak power and energy recovery","authors":"M. Putz, P. Blau, A. Kolesnikov, M. Richter, A. Pierer","doi":"10.1109/EPE.2016.7695645","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695645","url":null,"abstract":"The development approach for energy storage systems focuses on optimally sized capacitor modules to reduce peak power and to avoid energy recovery of production machines. Using servo presses as an example, the application of two different energy storage systems in the DC link is practically examined. A simulation model in Matlab/Simulink and a test stand of a servo press are proposed for representing the power flows between the mains supply, the electric drives and the storage systems. The description of forming machines and the behaviour of the electric components are used to control the amount of stored energy in a storage system and to influence the process regarding a reduction of peak power.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129452134","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695278
A. Birkel, M. Bakran
In this paper two tapping topologies will be compared in terms of efficiency and utilization of the installed semiconductors. Both topologies consist of a shunt connected two stage concept with a resonant DC/DC converter, followed by a medium power inverter on the low voltage side to supply an AC grid.
{"title":"Comparison of shunt connected tapping concepts in HVDC transmission systems","authors":"A. Birkel, M. Bakran","doi":"10.1109/EPE.2016.7695278","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695278","url":null,"abstract":"In this paper two tapping topologies will be compared in terms of efficiency and utilization of the installed semiconductors. Both topologies consist of a shunt connected two stage concept with a resonant DC/DC converter, followed by a medium power inverter on the low voltage side to supply an AC grid.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129480468","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695306
S. Wall, R. Ruan, Chang-geng Wang, Jingjing Xie
An evaluation is performed for three-phase solar Photo-Voltaic (PV) inverters using either Silicon (Si) or Silicon Carbide (SiC) power devices. Standard and emerging topologies for high-efficiency (>98%) PV inverters are identified and optimized for the capital cost of power filter components and power devices. Analytical formulae are developed for minimum filter inductance considering both current ripple and core-loss constraints. For string-type PV inverters, SiC power devices are shown to be cost competitive compared with Si power devices. Three example PV inverter designs are presented to showcase the use of SiC power devices. Experimental results demonstrate efficiency in excess of 98%.
{"title":"Evaluation of three-phase solar inverters using SiC devices","authors":"S. Wall, R. Ruan, Chang-geng Wang, Jingjing Xie","doi":"10.1109/EPE.2016.7695306","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695306","url":null,"abstract":"An evaluation is performed for three-phase solar Photo-Voltaic (PV) inverters using either Silicon (Si) or Silicon Carbide (SiC) power devices. Standard and emerging topologies for high-efficiency (>98%) PV inverters are identified and optimized for the capital cost of power filter components and power devices. Analytical formulae are developed for minimum filter inductance considering both current ripple and core-loss constraints. For string-type PV inverters, SiC power devices are shown to be cost competitive compared with Si power devices. Three example PV inverter designs are presented to showcase the use of SiC power devices. Experimental results demonstrate efficiency in excess of 98%.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129724137","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695545
M. Abu Bakar, F. Alam, K. Bertilsson
The electronics industry is progressing towards the high density board solutions due to the requirement of compact and intelligent electronic systems. In order to meet the industry demands, the power system is required to be of high power density. This article proposes one of the solution to improve the power density for the medium power applications. In phase shifted full bridge converter, the intrinsic leakage inductance of the main transformer is not high enough to obtain the zero voltage switching of the power switches for the entire operating conditions. An additional shim inductor is usually connected in series with the primary winding of the main transformer to increase the collective leakage inductance. This additional shim inductor degrades the power density of the converter. This paper proposes a method to embed and control the resonance inductance inside the main transformer. In addition to the increased inter-winding spacing, this paper proposes a practical approach to integrate the ferrite rods inside the main transformer for further increase in the leakage inductance. A power transformer is constructed and investigated by using the modelled equations to estimate the leakage inductance. A prototype phase shifted full bridge converter is also developed to investigate the performance of the proposed transformer. The converter is designed for the switching frequency of 400kHz, and tested up to 600watts output power at the input voltage of 200Vdc. The performance of the proposed converter is also compared with the converter of using an external inductor. The investigations show that, in addition to the improved power density, the converter with the proposed transformer is more efficient than the converter with the traditional transformer.
{"title":"A phase shifted full bridge converter with novel control over the leakage inductance","authors":"M. Abu Bakar, F. Alam, K. Bertilsson","doi":"10.1109/EPE.2016.7695545","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695545","url":null,"abstract":"The electronics industry is progressing towards the high density board solutions due to the requirement of compact and intelligent electronic systems. In order to meet the industry demands, the power system is required to be of high power density. This article proposes one of the solution to improve the power density for the medium power applications. In phase shifted full bridge converter, the intrinsic leakage inductance of the main transformer is not high enough to obtain the zero voltage switching of the power switches for the entire operating conditions. An additional shim inductor is usually connected in series with the primary winding of the main transformer to increase the collective leakage inductance. This additional shim inductor degrades the power density of the converter. This paper proposes a method to embed and control the resonance inductance inside the main transformer. In addition to the increased inter-winding spacing, this paper proposes a practical approach to integrate the ferrite rods inside the main transformer for further increase in the leakage inductance. A power transformer is constructed and investigated by using the modelled equations to estimate the leakage inductance. A prototype phase shifted full bridge converter is also developed to investigate the performance of the proposed transformer. The converter is designed for the switching frequency of 400kHz, and tested up to 600watts output power at the input voltage of 200Vdc. The performance of the proposed converter is also compared with the converter of using an external inductor. The investigations show that, in addition to the improved power density, the converter with the proposed transformer is more efficient than the converter with the traditional transformer.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129907809","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695316
A. Zibold, R. Reiner, Beatrix Weis, M. Kunzer, R. Quay, J. Wagner, P. Waltereit, O. Ambacher
This work demonstrates the suitability of AlGaN/GaN-on-Si Schottky diodes in a non-isolated buck converter for LED applications. To the authors' knowledge, this is the first time that AlGaN/GaN-on-Si Schottky diodes have been employed as flyback diodes in a non-isolated buck converter. First the diodes are specifically developed and characterized. Afterwards the diodes are tested in an advanced non-isolated buck converter for LED modules. The circuit is characterized and the approach is discussed and compared to state-of-the-art solutions.
{"title":"High voltage GaN-based Schottky diodes in non-isolated LED buck converters","authors":"A. Zibold, R. Reiner, Beatrix Weis, M. Kunzer, R. Quay, J. Wagner, P. Waltereit, O. Ambacher","doi":"10.1109/EPE.2016.7695316","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695316","url":null,"abstract":"This work demonstrates the suitability of AlGaN/GaN-on-Si Schottky diodes in a non-isolated buck converter for LED applications. To the authors' knowledge, this is the first time that AlGaN/GaN-on-Si Schottky diodes have been employed as flyback diodes in a non-isolated buck converter. First the diodes are specifically developed and characterized. Afterwards the diodes are tested in an advanced non-isolated buck converter for LED modules. The circuit is characterized and the approach is discussed and compared to state-of-the-art solutions.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128331075","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695478
Hongyang Zhang, L. Angquist, S. Norrga, H. Nee, S. Ostlund
The current from an electrical arc furnace (EAF) in a steel plant is highly unsymmetrical, i.e. it comprises a large amount of negative sequence. This causes problems with the voltage stability in the capacitor submodules for a static synchronous compensator (STATCOM), when implemented using the modular multilevel converter (M2C) concept. In order to counteract the uncontrollability of the capacitor voltage, a common practice is to circulate a zero-sequence fundamental current or a direct current. The method brings the benefit of re-balancing the active power among the individual phases while it requires over-rating of the valve current or dc voltage of the STATCOM. This would in practice give a more expensive design. This paper presents a benchmark of various M2C-based STATCOM designs considering the valve overrating. The STATCOM topologies will be benchmarked with the EAF modeled for all possible combinations of positive- and negative-sequence current. The rating comparison considering the dc capacitor ripple and zero-sequence harmonic injection are discussed.
{"title":"Benchmark of high-power STATCOM topologies for flicker compensation","authors":"Hongyang Zhang, L. Angquist, S. Norrga, H. Nee, S. Ostlund","doi":"10.1109/EPE.2016.7695478","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695478","url":null,"abstract":"The current from an electrical arc furnace (EAF) in a steel plant is highly unsymmetrical, i.e. it comprises a large amount of negative sequence. This causes problems with the voltage stability in the capacitor submodules for a static synchronous compensator (STATCOM), when implemented using the modular multilevel converter (M2C) concept. In order to counteract the uncontrollability of the capacitor voltage, a common practice is to circulate a zero-sequence fundamental current or a direct current. The method brings the benefit of re-balancing the active power among the individual phases while it requires over-rating of the valve current or dc voltage of the STATCOM. This would in practice give a more expensive design. This paper presents a benchmark of various M2C-based STATCOM designs considering the valve overrating. The STATCOM topologies will be benchmarked with the EAF modeled for all possible combinations of positive- and negative-sequence current. The rating comparison considering the dc capacitor ripple and zero-sequence harmonic injection are discussed.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128181370","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695619
Dennis Karwatzki, Lennart Baruschka, Marc Dokus, J. Kucka, A. Mertens
In this paper, branch energy balancing as part of a generalised control concept for modular multilevel converter topologies is investigated. A way to derive an optimal branch energy balancing regarding current stress is introduced. Afterwards, this generalised approach is applied to the Modular Multilevel Converter as an example topology. The approach is tested via simulation and verified with a low-voltage test setup.
{"title":"Branch energy balancing with a generalised control concept for modular multilevel topologies — Using the example of the modular multilevel converter","authors":"Dennis Karwatzki, Lennart Baruschka, Marc Dokus, J. Kucka, A. Mertens","doi":"10.1109/EPE.2016.7695619","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695619","url":null,"abstract":"In this paper, branch energy balancing as part of a generalised control concept for modular multilevel converter topologies is investigated. A way to derive an optimal branch energy balancing regarding current stress is introduced. Afterwards, this generalised approach is applied to the Modular Multilevel Converter as an example topology. The approach is tested via simulation and verified with a low-voltage test setup.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129558055","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695595
N. Remus, Martin Leubner, W. Hofmann
In this paper two recent presented active grid current stabilisation strategies for direct matrix converter based drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts. While the functionality of the active stabilisation strategies has been proven already this publication focuses on the harmonic distortion of grid and machine current as well as the efficiency of converter and machine. The purpose is to rate the performance of the active damping approaches. After a short introduction of the stabilisation strategies the experimental setup is described. Finally, several points of operation will be used to evaluate the strategies for long term use.
{"title":"Efficiency comparison of active and passive grid filter damping methods using direct matrix converter","authors":"N. Remus, Martin Leubner, W. Hofmann","doi":"10.1109/EPE.2016.7695595","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695595","url":null,"abstract":"In this paper two recent presented active grid current stabilisation strategies for direct matrix converter based drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts. While the functionality of the active stabilisation strategies has been proven already this publication focuses on the harmonic distortion of grid and machine current as well as the efficiency of converter and machine. The purpose is to rate the performance of the active damping approaches. After a short introduction of the stabilisation strategies the experimental setup is described. Finally, several points of operation will be used to evaluate the strategies for long term use.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127145382","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695364
Ying Chen, F. Zhuo, Fan Zhang, Wenjie Pan, Yan Yang
Parallel-connected IGBTs are prone to large-current destruction in high-power applications due to current unbalance between each IGBT branches. This paper proposes a novel control method to improve the current balance in order to protect the device against over current destruction. The method uses two control loops to confine the current rising speed as well as to reconcile the current change start time difference. Without current measurement or any manual operation, the implementation is thus simple and convenient. Details about the strategy and its superiority are discussed. Simulation results validate the effectiveness of the proposed method.
{"title":"A novel method for current balancing between parallel-connected IGBTs","authors":"Ying Chen, F. Zhuo, Fan Zhang, Wenjie Pan, Yan Yang","doi":"10.1109/EPE.2016.7695364","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695364","url":null,"abstract":"Parallel-connected IGBTs are prone to large-current destruction in high-power applications due to current unbalance between each IGBT branches. This paper proposes a novel control method to improve the current balance in order to protect the device against over current destruction. The method uses two control loops to confine the current rising speed as well as to reconcile the current change start time difference. Without current measurement or any manual operation, the implementation is thus simple and convenient. Details about the strategy and its superiority are discussed. Simulation results validate the effectiveness of the proposed method.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127247949","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 : 2016-09-01DOI: 10.1109/EPE.2016.7695413
Cord Prignitz, H. Eckel, H. Knaak
Future HVDC systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters. Due to this wind turbine inverters must own a grid forming capability. This paper describes a control strategy that requires only minor changes in the conventional wind turbine inverter control software to form the AC voltage in the offshore island grid connected via diode rectifier HVDC link.
{"title":"Voltage and current behavior in a FixReF controlled offshore wind farm using a HVDC transmission system based on uncontrolled diode rectifier units","authors":"Cord Prignitz, H. Eckel, H. Knaak","doi":"10.1109/EPE.2016.7695413","DOIUrl":"https://doi.org/10.1109/EPE.2016.7695413","url":null,"abstract":"Future HVDC systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters. Due to this wind turbine inverters must own a grid forming capability. This paper describes a control strategy that requires only minor changes in the conventional wind turbine inverter control software to form the AC voltage in the offshore island grid connected via diode rectifier HVDC link.","PeriodicalId":119358,"journal":{"name":"2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130046403","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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