Pub Date : 2014-09-29DOI: 10.1109/EPE.2014.6911045
S. Papadopoulos, M. Rashed, C. Klumpner, P. Wheeler
This paper proposes a new three phase hybrid inverter topology suitable for medium to high voltage inverter applications. The topology shown in Fig. 1 consists of a 3-phase VSI rated at medium voltage acting as a main inverter bridge processing the bulk power whilst being connected in parallel to a CSI acting as an active filter to cancel out the switching current ripple produced by the VSI. The CSI is connected via a series capacitor which minimises the voltage stress to only a small fraction of the fundamental grid voltage via a control approach shown in the paper. Therefore, the added installed power of the CSI is less than 4% of the main inverter bridge which should account for a small added cost. As a result, the hybrid topology allows for optimal device utilization to achieve high output current quality with minimal device ratings and potentially improved efficiency. The control of the CSI is independent to the main inverter bridge which means that the auxiliary converter solution can be retrofitted to existing medium voltage installations for power quality improvement.
{"title":"A hybrid converter for medium voltage using a low-voltage current source active filter connected via a series capacitor","authors":"S. Papadopoulos, M. Rashed, C. Klumpner, P. Wheeler","doi":"10.1109/EPE.2014.6911045","DOIUrl":"https://doi.org/10.1109/EPE.2014.6911045","url":null,"abstract":"This paper proposes a new three phase hybrid inverter topology suitable for medium to high voltage inverter applications. The topology shown in Fig. 1 consists of a 3-phase VSI rated at medium voltage acting as a main inverter bridge processing the bulk power whilst being connected in parallel to a CSI acting as an active filter to cancel out the switching current ripple produced by the VSI. The CSI is connected via a series capacitor which minimises the voltage stress to only a small fraction of the fundamental grid voltage via a control approach shown in the paper. Therefore, the added installed power of the CSI is less than 4% of the main inverter bridge which should account for a small added cost. As a result, the hybrid topology allows for optimal device utilization to achieve high output current quality with minimal device ratings and potentially improved efficiency. The control of the CSI is independent to the main inverter bridge which means that the auxiliary converter solution can be retrofitted to existing medium voltage installations for power quality improvement.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"10 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":"85296100","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.2014.6910943
C. Zoeller, M. Vogelsberger, P. Nussbaumer, T. Wolbank
In modern traction drive applications condition monitoring is getting more and more important. Insulation health state monitoring can be done by evaluating the high frequency current response to voltage step excitation by the signal analyses of the current sensors, which are also used for the control of the machine. This reduces the costs and number of necessary system components. A change in the current response is, amongst others, correlated to a change through insulation degradation. The dominant influencing parameters of the high frequency current response of the machine are parasitic winding capacitances as well as insulation resistances, which are slowly changing over time if the insulation is deteriorated through different stresses, e.g. thermal or electrical. These slow changes can be monitored over long time period and give evidence if additional maintenance steps are required. Thus an unforeseeable outage of the traction drive system caused by damage of the machine can be prevented. Before the insulation state can be evaluated certain signal processing steps are necessary to increase the sensitivity. In this work the method of stimulation as well as detection of changes in the dominant parameters is verified on a 1.4MW induction machine.
{"title":"Stimulating and detecting changes in the insulation health state of inverter fed ac machines","authors":"C. Zoeller, M. Vogelsberger, P. Nussbaumer, T. Wolbank","doi":"10.1109/EPE.2014.6910943","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910943","url":null,"abstract":"In modern traction drive applications condition monitoring is getting more and more important. Insulation health state monitoring can be done by evaluating the high frequency current response to voltage step excitation by the signal analyses of the current sensors, which are also used for the control of the machine. This reduces the costs and number of necessary system components. A change in the current response is, amongst others, correlated to a change through insulation degradation. The dominant influencing parameters of the high frequency current response of the machine are parasitic winding capacitances as well as insulation resistances, which are slowly changing over time if the insulation is deteriorated through different stresses, e.g. thermal or electrical. These slow changes can be monitored over long time period and give evidence if additional maintenance steps are required. Thus an unforeseeable outage of the traction drive system caused by damage of the machine can be prevented. Before the insulation state can be evaluated certain signal processing steps are necessary to increase the sensitivity. In this work the method of stimulation as well as detection of changes in the dominant parameters is verified on a 1.4MW induction machine.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"84 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":"83803366","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.2014.6910861
Weimin Wu, Zhen Wang, Jun Ji, F. Blaabjerg
Aalborg Inverter is a grid-tied DC/AC inverter. In order to optimize the design, its power losses are analyzed in detail, combined with a description of the single-phase operating principle and the modulation strategy. A 2 kW / 220 V experimental prototype is constructed to verify the theoretical analysis. It is concluded that a minimize inductance in the power loop does help the inverter to achieve the high efficiency with the good dynamic performance.
{"title":"Performance analysis of new type grid-tied inverter-Aalborg Inverter","authors":"Weimin Wu, Zhen Wang, Jun Ji, F. Blaabjerg","doi":"10.1109/EPE.2014.6910861","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910861","url":null,"abstract":"Aalborg Inverter is a grid-tied DC/AC inverter. In order to optimize the design, its power losses are analyzed in detail, combined with a description of the single-phase operating principle and the modulation strategy. A 2 kW / 220 V experimental prototype is constructed to verify the theoretical analysis. It is concluded that a minimize inductance in the power loop does help the inverter to achieve the high efficiency with the good dynamic performance.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"6 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":"82509716","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.2014.6910800
A. Dieng, J. Le Claire, M. Benkhoris, M. Ait-Ahmed
This papar deals with an optimal control of 5-Phase Vienna rectifier - PMSG set for Marine Current Turbine Applications. In order to optimize the transfert of the power all EMF harmonic are exploited. Then the control strategy needs to impose optimal current waveforms under normal operation and under fault operation. These current references are not constants in the abcde frame. Then a robust and accurate current controller is used.
{"title":"High-efficiency current control of five-phase VIENNA rectifier - PMSG SET for marine current turbine applications","authors":"A. Dieng, J. Le Claire, M. Benkhoris, M. Ait-Ahmed","doi":"10.1109/EPE.2014.6910800","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910800","url":null,"abstract":"This papar deals with an optimal control of 5-Phase Vienna rectifier - PMSG set for Marine Current Turbine Applications. In order to optimize the transfert of the power all EMF harmonic are exploited. Then the control strategy needs to impose optimal current waveforms under normal operation and under fault operation. These current references are not constants in the abcde frame. Then a robust and accurate current controller is used.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"10 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":"82977807","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.2014.6910873
Diego Torres-Lobera, S. Valkealahti
Photovoltaic (PV) technology permits us to harness and transform solar radiation into electricity. However, PV power generators are still a marginal share in the global power generation capacity. One of the main reasons for it is that PV systems are greatly dependent on the atmospheric conditions affecting their operation. Furthermore, series connection of PV cells is prone to power losses when the electrical characteristics of the cells are dissimilar or the cells operate under non-uniform operating conditions. Accurate electrical models are required to analyze PV systems under non-ideal operating conditions, for example, to optimize the design of grid inverters. This paper proposes a method to optimize the accuracy of the electrical models based on a sensitivity analysis of the parameters of the model and on the evaluation of the normalized root mean square error between the measured and simulated P-V characteristics continuously by the second.
{"title":"Optimizing the accuracy of electrical models of PV systems operating under non-ideal conditions","authors":"Diego Torres-Lobera, S. Valkealahti","doi":"10.1109/EPE.2014.6910873","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910873","url":null,"abstract":"Photovoltaic (PV) technology permits us to harness and transform solar radiation into electricity. However, PV power generators are still a marginal share in the global power generation capacity. One of the main reasons for it is that PV systems are greatly dependent on the atmospheric conditions affecting their operation. Furthermore, series connection of PV cells is prone to power losses when the electrical characteristics of the cells are dissimilar or the cells operate under non-uniform operating conditions. Accurate electrical models are required to analyze PV systems under non-ideal operating conditions, for example, to optimize the design of grid inverters. This paper proposes a method to optimize the accuracy of the electrical models based on a sensitivity analysis of the parameters of the model and on the evaluation of the normalized root mean square error between the measured and simulated P-V characteristics continuously by the second.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"57 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":"77756321","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.2014.6910823
Xibo Yuan
This paper has proposed a new non-regenerative three-phase four-level rectifier topology with only half of the active devices of the conventional four-level rectifier. Each phase leg has only three active devices. The operation of the rectifier with regards to current path and output voltage levels are analysed. The available voltage vectors in this type of rectifier are constrained by the current flow direction. The maximum active power and reactive power capacity of the rectifier have been derived. A simple carrier-based modulation scheme is presented to modulate the rectifier as well as balance the dc-link capacitors' voltages. Simulation results have validated the topology and control scheme.
{"title":"A new nine-switch non-regenerative four-level rectifier","authors":"Xibo Yuan","doi":"10.1109/EPE.2014.6910823","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910823","url":null,"abstract":"This paper has proposed a new non-regenerative three-phase four-level rectifier topology with only half of the active devices of the conventional four-level rectifier. Each phase leg has only three active devices. The operation of the rectifier with regards to current path and output voltage levels are analysed. The available voltage vectors in this type of rectifier are constrained by the current flow direction. The maximum active power and reactive power capacity of the rectifier have been derived. A simple carrier-based modulation scheme is presented to modulate the rectifier as well as balance the dc-link capacitors' voltages. Simulation results have validated the topology and control scheme.","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":"80885501","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.2014.6910785
Yu Du, A. Huang, Fei Xue, Ruiyang Yu
The paper presented a new energy storage device based on low-voltage (12.8V) Li-ion battery pack with an embedded DC-DC converter. The batteries and converter are packaged together. The integrated battery pack can be directly connected to high-voltage (400V) DC grid, enabling a modular approach for battery energy storage systems.
{"title":"A modular integrated Li-ion battery pack with a multi-core based transformer isolated bidirectional DC-DC converter","authors":"Yu Du, A. Huang, Fei Xue, Ruiyang Yu","doi":"10.1109/EPE.2014.6910785","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910785","url":null,"abstract":"The paper presented a new energy storage device based on low-voltage (12.8V) Li-ion battery pack with an embedded DC-DC converter. The batteries and converter are packaged together. The integrated battery pack can be directly connected to high-voltage (400V) DC grid, enabling a modular approach for battery energy storage systems.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"26 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":"78848022","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.2014.6910867
S. Schroth, F. Krismer, J. Kolar, H. Ertl
This Paper details two different contributions related to practical CM/DM EMI measurements. A first part investigates sources and implications of measurement errors that result for CM/DM separators in a practical measurement environment with a particular focus on the recently presented input impedance criterion for CM/DM separators. Furthermore, the realization of an active CM/DM separator, which features competitive separation capabilities (DMTR/CMRR > 51 dB and CMTR/DMRR > 47 dB for frequencies up to 10MHz), is presented.
{"title":"Analysis and practical relevance of CM/DM EMI noise separator characteristics","authors":"S. Schroth, F. Krismer, J. Kolar, H. Ertl","doi":"10.1109/EPE.2014.6910867","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910867","url":null,"abstract":"This Paper details two different contributions related to practical CM/DM EMI measurements. A first part investigates sources and implications of measurement errors that result for CM/DM separators in a practical measurement environment with a particular focus on the recently presented input impedance criterion for CM/DM separators. Furthermore, the realization of an active CM/DM separator, which features competitive separation capabilities (DMTR/CMRR > 51 dB and CMTR/DMRR > 47 dB for frequencies up to 10MHz), is presented.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"439 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":"82893521","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.2014.6910787
P. Sergeant, H. Vansompel, L. Dupré, A. Van den Bossche
The goal of this paper is to study the additional loss caused by Pulse Width Modulation (PWM), on the one hand in an axial flux permanent magnet synchronous machine (PMSM), and on the other hand in the voltage source inverter (VSI) that supplies the machine. Via a computationally efficient technique, the losses are computed in the stator iron and in the magnets of the axial flux PMSM with PWM supply. In addition, the switching losses of the converter are estimated as a function of the PWM frequency. The losses are evaluated in both the machine and the power electronic converter for several PWM frequencies, for several stator currents and for different magnet segmentations. It is observed that with unsegmented magnets, a high PWM frequency results in much lower total losses of the drive than a low PWM frequency. With segmented magnets, the influence of the PWM frequency on the losses of the drive is much smaller. Only in overload conditions, at twice the rated stator current, the lowest considered PWM frequency results in the lowest losses.
{"title":"Losses in VSI-PWM fed axial flux machines","authors":"P. Sergeant, H. Vansompel, L. Dupré, A. Van den Bossche","doi":"10.1109/EPE.2014.6910787","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910787","url":null,"abstract":"The goal of this paper is to study the additional loss caused by Pulse Width Modulation (PWM), on the one hand in an axial flux permanent magnet synchronous machine (PMSM), and on the other hand in the voltage source inverter (VSI) that supplies the machine. Via a computationally efficient technique, the losses are computed in the stator iron and in the magnets of the axial flux PMSM with PWM supply. In addition, the switching losses of the converter are estimated as a function of the PWM frequency. The losses are evaluated in both the machine and the power electronic converter for several PWM frequencies, for several stator currents and for different magnet segmentations. It is observed that with unsegmented magnets, a high PWM frequency results in much lower total losses of the drive than a low PWM frequency. With segmented magnets, the influence of the PWM frequency on the losses of the drive is much smaller. Only in overload conditions, at twice the rated stator current, the lowest considered PWM frequency results in the lowest losses.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"1 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":"90786706","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.2014.6910960
Sungmin Kim, Jae-Seung Jung, Shenghui Cui, S. Sul
To increase the popularity of HVDC power transmission system, the Multi-Terminal Direct Current (MTDC) power transmission system is expected to be installed. Since the Voltage Source Converter HVDC (VSC-HVDC) is available, the MTDC systems are much more likely to be installed soon. However, an efficient Direct Current blocking measure such as DC circuit breaker remains as the most critical hurdle to implement MTDC system. In this paper, a new DC current suppression circuit is proposed. This circuit is a kind of the semiconductor DC circuit breaker, and can be used for very quickly interrupting the DC current against the short circuit fault condition at the cost of minimum conduction loss at the normal operation. Because of the modular configuration, the proposed circuit has inherent redundancy and no need of the series-connection of the semiconductor switches and bulky surge voltage arrestor bank.
{"title":"DC current suppression circuit in HVDC power transmission system","authors":"Sungmin Kim, Jae-Seung Jung, Shenghui Cui, S. Sul","doi":"10.1109/EPE.2014.6910960","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910960","url":null,"abstract":"To increase the popularity of HVDC power transmission system, the Multi-Terminal Direct Current (MTDC) power transmission system is expected to be installed. Since the Voltage Source Converter HVDC (VSC-HVDC) is available, the MTDC systems are much more likely to be installed soon. However, an efficient Direct Current blocking measure such as DC circuit breaker remains as the most critical hurdle to implement MTDC system. In this paper, a new DC current suppression circuit is proposed. This circuit is a kind of the semiconductor DC circuit breaker, and can be used for very quickly interrupting the DC current against the short circuit fault condition at the cost of minimum conduction loss at the normal operation. Because of the modular configuration, the proposed circuit has inherent redundancy and no need of the series-connection of the semiconductor switches and bulky surge voltage arrestor bank.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"2 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":"90868616","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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