Pub Date : 2018-10-22DOI: 10.23919/IPEC.2018.8507510
Toru Ogawa, Tomohira Takahashi, M. Takemoto, S. Ogasawara, H. Arita, A. Daikoku
This paper presents an examination of increasing operation speed of consequent pole type axial gap motor to achieve higher output density. Our research group has been developing consequent pole type axial gap motor with field windings for traction motor of electric vehicles. From the point of fuel economy and layout, smaller and lighter traction motor is required. It is profitable to increase operation speed for reducing the size of motor. It is necessary to suppress line to line voltage to achieve high speed operation, and we examined pole-slot combination. Moreover, as rotor’s outer diameter of axial gap motor is larger than that of radial gap motor, the strength of rotor should be considered. We studied the adoption of non- magnetic high tensile strength steel for rotor supporting component. Motor design and the result of spin burst test are presented and we confirmed the operation of target maximum speed and output power density can be possible.
{"title":"The Examination of Increasing Operation Speed of Consequent Pole Type Axial Gap Motor for Higher Output Power Density","authors":"Toru Ogawa, Tomohira Takahashi, M. Takemoto, S. Ogasawara, H. Arita, A. Daikoku","doi":"10.23919/IPEC.2018.8507510","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507510","url":null,"abstract":"This paper presents an examination of increasing operation speed of consequent pole type axial gap motor to achieve higher output density. Our research group has been developing consequent pole type axial gap motor with field windings for traction motor of electric vehicles. From the point of fuel economy and layout, smaller and lighter traction motor is required. It is profitable to increase operation speed for reducing the size of motor. It is necessary to suppress line to line voltage to achieve high speed operation, and we examined pole-slot combination. Moreover, as rotor’s outer diameter of axial gap motor is larger than that of radial gap motor, the strength of rotor should be considered. We studied the adoption of non- magnetic high tensile strength steel for rotor supporting component. Motor design and the result of spin burst test are presented and we confirmed the operation of target maximum speed and output power density can be possible.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"9 1","pages":"2796-2801"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79857678","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507737
Z. Gong, Bjorn A. C. van de Ven, Y. Lu, Y. Luo, K. Gupta, C. D. da Silva, H. Bergveld, O. Trescases
Improved utilisation of the total energy storage in Electric Vehicle (EV) battery systems can be achieved through balancing of the series-connected battery units based on parameters such as the terminal voltage and State-of-Charge (SOC). This paper proposes a BMS power architecture where at any given time, an isolated converter connects either a module or one of its constituent sub-modules to the vehicle auxiliary bus, where a 12V lead-acid battery is present. The converters operate in burst-mode with a period of 10 s to simultaneously balance the sub-modules and regulate the auxiliary bus voltage. The use of module and sub-module input modes to the converters enables the supply of high-power auxiliary loads without an increase in converter input current rating. Simulations of one rule-based and one variable-priority control algorithm, both using SOC as the balancing parameter, are shown over a 6 hour load profile and 5% maximum initial SOC imbalance, for a 4 kWh liquid-cooled battery module prototye. Measurements using the same prototype are shown to match the simulation results. The simulation and experimental results highlight the necessary trade-off, in the system control, between auxiliary bus voltage regulation and balancing rate.
{"title":"EV BMS with Time-Shared Isolated Converters for Active Balancing and Auxiliary Bus Regulation","authors":"Z. Gong, Bjorn A. C. van de Ven, Y. Lu, Y. Luo, K. Gupta, C. D. da Silva, H. Bergveld, O. Trescases","doi":"10.23919/IPEC.2018.8507737","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507737","url":null,"abstract":"Improved utilisation of the total energy storage in Electric Vehicle (EV) battery systems can be achieved through balancing of the series-connected battery units based on parameters such as the terminal voltage and State-of-Charge (SOC). This paper proposes a BMS power architecture where at any given time, an isolated converter connects either a module or one of its constituent sub-modules to the vehicle auxiliary bus, where a 12V lead-acid battery is present. The converters operate in burst-mode with a period of 10 s to simultaneously balance the sub-modules and regulate the auxiliary bus voltage. The use of module and sub-module input modes to the converters enables the supply of high-power auxiliary loads without an increase in converter input current rating. Simulations of one rule-based and one variable-priority control algorithm, both using SOC as the balancing parameter, are shown over a 6 hour load profile and 5% maximum initial SOC imbalance, for a 4 kWh liquid-cooled battery module prototye. Measurements using the same prototype are shown to match the simulation results. The simulation and experimental results highlight the necessary trade-off, in the system control, between auxiliary bus voltage regulation and balancing rate.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"69 1","pages":"267-274"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83541283","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507991
Jongwon Heo, K. Kondo
In the PMSM sensorless drive system, when the power supply is lost, the position of rotor cannot be estimated by the usual control method. And the system stops due to the Filter Condenser (FC) voltage or the rotation speed decrease. To solve this problem, we proposed effective control methods at the interruption of power supply. There are three methods depending on inertial loads of the application and duration of the power interruption. In this paper, we explain the structure and characteristics of the three control methods and compare them. And we propose an appropriate continuous operation control depending on application and usage environment.
{"title":"Continuous Operation Control of PMSM in the case of DC Power Supply Loss","authors":"Jongwon Heo, K. Kondo","doi":"10.23919/IPEC.2018.8507991","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507991","url":null,"abstract":"In the PMSM sensorless drive system, when the power supply is lost, the position of rotor cannot be estimated by the usual control method. And the system stops due to the Filter Condenser (FC) voltage or the rotation speed decrease. To solve this problem, we proposed effective control methods at the interruption of power supply. There are three methods depending on inertial loads of the application and duration of the power interruption. In this paper, we explain the structure and characteristics of the three control methods and compare them. And we propose an appropriate continuous operation control depending on application and usage environment.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"37 1","pages":"726-731"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79272270","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507395
T. Ninomiya, Abdulaziz Gasim, S. Shimomura
This paper makes basic examination on four models of linear PM vernier motors in order to apply them to a steel-wheel linear motor train. Their models are categorized into two types with PM arrangement. One is the motor that has the PM arrangement based on the original design of the conventional PM vernier motor, and the other is the motor with a spoke type arrangement of PMs, which we have previously proposed. Typical vernier motors have a short air gap length, but the one that is applied to the steel-wheel linear motor train requires a larger air gap length. The examinations find a result that in the motor with the conventional PM arrangement increase of the PM volume hardly contribute to increase of the thrust, but that in the motor with the PM arrangement of a spoke type has a good effect on increasing the thrust.
{"title":"Magnet Arrangement suitable for Large Air Gap Length in Linear PM Vernier Motor","authors":"T. Ninomiya, Abdulaziz Gasim, S. Shimomura","doi":"10.23919/IPEC.2018.8507395","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507395","url":null,"abstract":"This paper makes basic examination on four models of linear PM vernier motors in order to apply them to a steel-wheel linear motor train. Their models are categorized into two types with PM arrangement. One is the motor that has the PM arrangement based on the original design of the conventional PM vernier motor, and the other is the motor with a spoke type arrangement of PMs, which we have previously proposed. Typical vernier motors have a short air gap length, but the one that is applied to the steel-wheel linear motor train requires a larger air gap length. The examinations find a result that in the motor with the conventional PM arrangement increase of the PM volume hardly contribute to increase of the thrust, but that in the motor with the PM arrangement of a spoke type has a good effect on increasing the thrust.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"21 1","pages":"2836-2841"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73719706","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507603
H. Ando, R. Takahashi, S. Azuma, M. Hasegawa, T. Yokoyama, T. Hikihara
Distributing power packets in a network is an efficient technique for supplying power to distributed loads. In the case that the amount of power is limited in a closed network system, the consensus algorithm can be useful for sharing the limited power resource in the system. For example, we consider a power network consisting of one power source and N(≫1) loads. We assume that each load has a buffer that can store the power for driving the load. It is important to efficiently share the limited power from the single source. One possible way for sharing power is as follows. First, all loads are divided into several clusters. Next, the power source sends power packets to each cluster by responding to the feedback information on how much power is required by the loads in the cluster. If the power demand of one load exceeds the power supply from the source, the deficient power is accommodated by the consensus algorithm among the buffers within the cluster. We discuss by numerical simulations how to cluster the loads in terms of the balance between the cost for distributing power from the source and the performance of loads.
{"title":"A resource sharing model in a power packet distribution network","authors":"H. Ando, R. Takahashi, S. Azuma, M. Hasegawa, T. Yokoyama, T. Hikihara","doi":"10.23919/IPEC.2018.8507603","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507603","url":null,"abstract":"Distributing power packets in a network is an efficient technique for supplying power to distributed loads. In the case that the amount of power is limited in a closed network system, the consensus algorithm can be useful for sharing the limited power resource in the system. For example, we consider a power network consisting of one power source and N(≫1) loads. We assume that each load has a buffer that can store the power for driving the load. It is important to efficiently share the limited power from the single source. One possible way for sharing power is as follows. First, all loads are divided into several clusters. Next, the power source sends power packets to each cluster by responding to the feedback information on how much power is required by the loads in the cluster. If the power demand of one load exceeds the power supply from the source, the deficient power is accommodated by the consensus algorithm among the buffers within the cluster. We discuss by numerical simulations how to cluster the loads in terms of the balance between the cost for distributing power from the source and the performance of loads.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"25 1","pages":"3665-3669"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84349819","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507605
Wataru Kodaka, S. Ogasawara, K. Orikawa, M. Takemoto, Takashi Hyodo, Hiroyuki Tokusaki
Insulated AC/DC converters using matrix converters (MCs) have higher efficiency, smaller size, and longer lifespan compared with conventional ones. For downsizing of high-frequency (HF) transformers in these converters, developments of HF output MC control methods are active. It is expected to improve efficiency by applying soft switching techniques for these converters. However, to achieve soft switching, phase difference between an output voltage and a current is required. As a result, output power factor decreases. In this paper, a relationship between soft switching conditions and output power factor is revealed. Considering this relationship, the authors propose a new MC control method to achieve soft switching and maximum output power factor. Additionally, this method enables to suppress the distortion of input currents and reduce ripple of the output current. Also, the MC can control the output current and instantaneous reactive power. The authors confirm that experimental results show validity of the method.
{"title":"Three-Phase to High-Frequency Single-Phase Matrix Converter : A Frequency Control Suitable for Soft Switching","authors":"Wataru Kodaka, S. Ogasawara, K. Orikawa, M. Takemoto, Takashi Hyodo, Hiroyuki Tokusaki","doi":"10.23919/IPEC.2018.8507605","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507605","url":null,"abstract":"Insulated AC/DC converters using matrix converters (MCs) have higher efficiency, smaller size, and longer lifespan compared with conventional ones. For downsizing of high-frequency (HF) transformers in these converters, developments of HF output MC control methods are active. It is expected to improve efficiency by applying soft switching techniques for these converters. However, to achieve soft switching, phase difference between an output voltage and a current is required. As a result, output power factor decreases. In this paper, a relationship between soft switching conditions and output power factor is revealed. Considering this relationship, the authors propose a new MC control method to achieve soft switching and maximum output power factor. Additionally, this method enables to suppress the distortion of input currents and reduce ripple of the output current. Also, the MC can control the output current and instantaneous reactive power. The authors confirm that experimental results show validity of the method.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"355 1","pages":"2589-2595"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76416019","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507723
Yunpeng Si, Yifu Liu, Qin Lei
This paper proposes a standard module of "Isolated Half Bridge (IHB)" or "Isolated Full Bridge (IFB)" and its application in MVDC/MVAC system by using modular structure. The fundamental and 2nd harmonic current ripple can be eliminated through connecting the DC links of three phase on the same level. Energy density and system efficiency can be largely improved since the capacitor size is reduced. In addition, energy storage devices can be integrated in the proposed topology and thus make it feasible for smart grid and marine applications. Detailed simulation results of comparison between proposed topology and traditional MMC have been presented. Moreover, medium voltage drive starting from zero frequency is also simulated. Modular DC/DC converters with energy storage are discussed as well.
{"title":"New Module with Isolated Half Bridge or Isolated Full Bridge for Modular Medium voltage converter","authors":"Yunpeng Si, Yifu Liu, Qin Lei","doi":"10.23919/IPEC.2018.8507723","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507723","url":null,"abstract":"This paper proposes a standard module of \"Isolated Half Bridge (IHB)\" or \"Isolated Full Bridge (IFB)\" and its application in MVDC/MVAC system by using modular structure. The fundamental and 2nd harmonic current ripple can be eliminated through connecting the DC links of three phase on the same level. Energy density and system efficiency can be largely improved since the capacitor size is reduced. In addition, energy storage devices can be integrated in the proposed topology and thus make it feasible for smart grid and marine applications. Detailed simulation results of comparison between proposed topology and traditional MMC have been presented. Moreover, medium voltage drive starting from zero frequency is also simulated. Modular DC/DC converters with energy storage are discussed as well.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"25 1","pages":"2400-2403"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74817726","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507997
Jia-You Lee, Yu-chi Wang, Chih-Yi Liao
This paper is aimed to utilize the technology of contactless power transmission to design and implement contactless electric vehicle power track system with segment-excited inductively coupled structure array. To increase the tolerances of lateral and longitudinal displacement that between vehicle and the track, the simulation software have analyzed the track coil of magnetic field and selected the spiral structure with a uniform magnetic field distribution. The size of pickup coil has also been determined to let the system receive power efficiently. The overall track consists of pad arrays. For reducing power loss caused by turning on the track power simultaneously, the segment-excited control has been set up in the system. Based on the experimental results, the maximum output power of system is 910.6 W and the highest efficiency is 75% with 160 V input dc supply voltage and load resistance 80.7 Ω under 12 cm air-gap.
{"title":"Contactless EV Power Track System with Segment-Excited Inductively Coupled Structure","authors":"Jia-You Lee, Yu-chi Wang, Chih-Yi Liao","doi":"10.23919/IPEC.2018.8507997","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507997","url":null,"abstract":"This paper is aimed to utilize the technology of contactless power transmission to design and implement contactless electric vehicle power track system with segment-excited inductively coupled structure array. To increase the tolerances of lateral and longitudinal displacement that between vehicle and the track, the simulation software have analyzed the track coil of magnetic field and selected the spiral structure with a uniform magnetic field distribution. The size of pickup coil has also been determined to let the system receive power efficiently. The overall track consists of pad arrays. For reducing power loss caused by turning on the track power simultaneously, the segment-excited control has been set up in the system. Based on the experimental results, the maximum output power of system is 910.6 W and the highest efficiency is 75% with 160 V input dc supply voltage and load resistance 80.7 Ω under 12 cm air-gap.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"107 1","pages":"657-662"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80528296","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507509
A. Risseh, H. Nee, K. Kostov
Parasitic inductances caused by the package of semiconductor devices in power converters, are limiting the switching speed and giving rise to higher switching losses than necessary. In this study a half-bridge planar power module with Silicon Carbide (SiC) MOSFET bare dies was designed and manufactured for ultra-low parasitic inductance. The circuit structure was simulated and the parasitic inductances were extracted from ANSYS-Q3D. The values were then fed into LT-Spice to simulate the electrical behavior of the half-bridge. The experimental and simulation results were compared to each other and were used to adjust and easily extend the simulation model with additional MOSFETs for higher current capability. It was shown that the proposed planar module, with four parallel SiC MOSFETs at each position, is able to switch 600V and 400A during 40 and 17ns with EON and EOFF equal to 3.1 and 1.3mJ, respectively. Moreover, unlike the commercial modules, this design allows double-sided cooling to extract the generated heat from the device, resulting in lower operating temperature.
{"title":"Fast Switching Planar Power Module With SiC MOSFETs and Ultra-low Parasitic Inductance","authors":"A. Risseh, H. Nee, K. Kostov","doi":"10.23919/IPEC.2018.8507509","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507509","url":null,"abstract":"Parasitic inductances caused by the package of semiconductor devices in power converters, are limiting the switching speed and giving rise to higher switching losses than necessary. In this study a half-bridge planar power module with Silicon Carbide (SiC) MOSFET bare dies was designed and manufactured for ultra-low parasitic inductance. The circuit structure was simulated and the parasitic inductances were extracted from ANSYS-Q3D. The values were then fed into LT-Spice to simulate the electrical behavior of the half-bridge. The experimental and simulation results were compared to each other and were used to adjust and easily extend the simulation model with additional MOSFETs for higher current capability. It was shown that the proposed planar module, with four parallel SiC MOSFETs at each position, is able to switch 600V and 400A during 40 and 17ns with EON and EOFF equal to 3.1 and 1.3mJ, respectively. Moreover, unlike the commercial modules, this design allows double-sided cooling to extract the generated heat from the device, resulting in lower operating temperature.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"70 1","pages":"2732-2737"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75075907","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 : 2018-10-22DOI: 10.23919/IPEC.2018.8507731
Zhongxu Wang, Huai Wang, Yi Zhang, F. Blaabjerg
Due to the parameter mismatch, the unbalanced power loss distribution among SMs in the modular multilevel converter (MMC) can be introduced and further deteriorated by the low-frequency asynchronous switching transients related to no-carrier modulation techniques. The unbalanced thermal stress can reduce the reliability of the MMC and increase the complexity of cooling system design. Nevertheless, an internal balance mechanism exists in the MMC thanks to the capacitor voltage balancing. It contributes to an even conduction loss dissipation among SMs, which is studied and revealed in this paper. Moreover, a computationally light conduction loss estimation method is proposed correspondingly relying on the characteristics of semiconductors and the arm current only. Simulations and experiments are conducted to verify the effectiveness the proposed method.
{"title":"Balanced Conduction Loss Distribution among SMs in Modular Multilevel Converters","authors":"Zhongxu Wang, Huai Wang, Yi Zhang, F. Blaabjerg","doi":"10.23919/IPEC.2018.8507731","DOIUrl":"https://doi.org/10.23919/IPEC.2018.8507731","url":null,"abstract":"Due to the parameter mismatch, the unbalanced power loss distribution among SMs in the modular multilevel converter (MMC) can be introduced and further deteriorated by the low-frequency asynchronous switching transients related to no-carrier modulation techniques. The unbalanced thermal stress can reduce the reliability of the MMC and increase the complexity of cooling system design. Nevertheless, an internal balance mechanism exists in the MMC thanks to the capacitor voltage balancing. It contributes to an even conduction loss dissipation among SMs, which is studied and revealed in this paper. Moreover, a computationally light conduction loss estimation method is proposed correspondingly relying on the characteristics of semiconductors and the arm current only. Simulations and experiments are conducted to verify the effectiveness the proposed method.","PeriodicalId":6610,"journal":{"name":"2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)","volume":"58 1","pages":"3123-3128"},"PeriodicalIF":0.0,"publicationDate":"2018-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83961674","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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