Pub Date : 2012-11-12DOI: 10.1109/ECCE.2012.6342657
Weimin Zhang, Yu Long, Zheyu Zhang, F. Wang, L. Tolbert, B. Blalock, S. Henning, C. Wilson, R. Dean
Silicon Power MOSFETs, with more than thirty years of development, are widely accepted and applied in power converters. Gallium Nitride (GaN) power devices are commercially available in recent years [1], but the device performance and application have not been fully developed. In this paper, GaN devices are compared with state-of-art Si devices to evaluate the device impact on soft-switching DC-DC converters, like LLC resonant converter. The analytical approach of device selection and comparison are conducted and loss related device parameters are derived. Total device losses are compared between Si and GaN based on these parameters. GaN shows less loss compared with Si, yielding approximately a 20% reduction of total device loss. Two 300 W, 500 kHz, 48 V-12 V GaN-based and Si-based converter prototypes are built and tested. Since the body diode forward voltage drop of GaN device is high, the dead time is adjusted to minimize the body diode conduction period. The peak efficiency of the GaN-based converter is 97.5%, and the full load efficiency is 96.1%, which is around 0.3% higher than the Si-based converter at full load. The test results shows that, although GaN device has lower loss, the improvement of converter efficiency is not much. The reason is that the transformer loss accounts for more than 60% of total loss. Therefore, a transformer which fits the GaN device characteristic need to be further investigated.
{"title":"Evaluation and comparison of silicon and gallium nitride power transistors in LLC resonant converter","authors":"Weimin Zhang, Yu Long, Zheyu Zhang, F. Wang, L. Tolbert, B. Blalock, S. Henning, C. Wilson, R. Dean","doi":"10.1109/ECCE.2012.6342657","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342657","url":null,"abstract":"Silicon Power MOSFETs, with more than thirty years of development, are widely accepted and applied in power converters. Gallium Nitride (GaN) power devices are commercially available in recent years [1], but the device performance and application have not been fully developed. In this paper, GaN devices are compared with state-of-art Si devices to evaluate the device impact on soft-switching DC-DC converters, like LLC resonant converter. The analytical approach of device selection and comparison are conducted and loss related device parameters are derived. Total device losses are compared between Si and GaN based on these parameters. GaN shows less loss compared with Si, yielding approximately a 20% reduction of total device loss. Two 300 W, 500 kHz, 48 V-12 V GaN-based and Si-based converter prototypes are built and tested. Since the body diode forward voltage drop of GaN device is high, the dead time is adjusted to minimize the body diode conduction period. The peak efficiency of the GaN-based converter is 97.5%, and the full load efficiency is 96.1%, which is around 0.3% higher than the Si-based converter at full load. The test results shows that, although GaN device has lower loss, the improvement of converter efficiency is not much. The reason is that the transformer loss accounts for more than 60% of total loss. Therefore, a transformer which fits the GaN device characteristic need to be further investigated.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"62 1","pages":"1362-1366"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91038126","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342237
Saijun Zhang, Xiaoyan Yu
It is desirable to have low input current ripple for Photovoltaic / Fuel Cell Power Conditioning System (PCS). A typical input filter could be bulky and costly in order to decrease the input current ripple of the dc-dc converter to satisfy the requirement of low current ripple. This paper proposes a new control approach of adjusting the active phase number and switching frequency to achieve the low or zero input current ripples in the interleaved boost converter. Therefore the input filter is not needed in steady-state. Comparing with existing common solutions, this solution features a lower cost, more compact, better current ripple performance and higher reliability. Simulation and experimental results show that the input current ripples can be greatly decreased with this strategy. The principle of this control approach is also valid for other common interleaved dc-dc topologies.
{"title":"Control strategy to achieve minimum / zero input current ripple for the interleaved boost converter in Photovoltaic / Fuel Cell Power Conditioning System","authors":"Saijun Zhang, Xiaoyan Yu","doi":"10.1109/ECCE.2012.6342237","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342237","url":null,"abstract":"It is desirable to have low input current ripple for Photovoltaic / Fuel Cell Power Conditioning System (PCS). A typical input filter could be bulky and costly in order to decrease the input current ripple of the dc-dc converter to satisfy the requirement of low current ripple. This paper proposes a new control approach of adjusting the active phase number and switching frequency to achieve the low or zero input current ripples in the interleaved boost converter. Therefore the input filter is not needed in steady-state. Comparing with existing common solutions, this solution features a lower cost, more compact, better current ripple performance and higher reliability. Simulation and experimental results show that the input current ripples can be greatly decreased with this strategy. The principle of this control approach is also valid for other common interleaved dc-dc topologies.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"8 1","pages":"4301-4306"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89428241","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342465
Jiadan Wei, Qingqing Zheng, Yiwei Yang
In order to overcome the excitation problem of the brushless synchronous machine used as starter for engine cranking in the variable frequency starter/generator system, this paper presented a novel three phase open-winding structure of the excitation generator with double inverters for supplying the integrated AC and DC excitation power to the major machine. The control strategies of three-phase AC excitation in the initial start process and DC excitation in the high-middle speed was given, then, the switch method of AC and DC excitation was analyzed. A simulation model of the proposed excitation system is built and the simulation results verify that the proposed control strategies could supply smooth excitation current for the brushless machine and the torque in start process can be maintained.
{"title":"Integrated AC and DC excitation method for brushless synchronous machine","authors":"Jiadan Wei, Qingqing Zheng, Yiwei Yang","doi":"10.1109/ECCE.2012.6342465","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342465","url":null,"abstract":"In order to overcome the excitation problem of the brushless synchronous machine used as starter for engine cranking in the variable frequency starter/generator system, this paper presented a novel three phase open-winding structure of the excitation generator with double inverters for supplying the integrated AC and DC excitation power to the major machine. The control strategies of three-phase AC excitation in the initial start process and DC excitation in the high-middle speed was given, then, the switch method of AC and DC excitation was analyzed. A simulation model of the proposed excitation system is built and the simulation results verify that the proposed control strategies could supply smooth excitation current for the brushless machine and the torque in start process can be maintained.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"50 1","pages":"2322-2325"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89980930","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342551
Zhiliang Zhang, Xiao-Fei He, X. Ren, Xin Li, Yanfei Liu
Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used for the flyback micro-inverter. BCM and DCM control strategies are investigated for the interleaved flyback micro-inverter concentrating on the loss analysis under different load condition. These two control strategies have different impact on the loss distribution and thus the efficiency of the flyback micro-inverter. Based on the loss analysis, a new hybrid control strategy combing the two-phase DCM and one-phase DCM control is proposed to improve the efficiency in wide load range by reducing the dominant losses depending on the load current. The experimental results verified the benefits of the proposed control.
{"title":"Multi-mode control for photovoltaic grid-connected interleaved flyback micro-inverters to achieve high efficiency in wide load range","authors":"Zhiliang Zhang, Xiao-Fei He, X. Ren, Xin Li, Yanfei Liu","doi":"10.1109/ECCE.2012.6342551","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342551","url":null,"abstract":"Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used for the flyback micro-inverter. BCM and DCM control strategies are investigated for the interleaved flyback micro-inverter concentrating on the loss analysis under different load condition. These two control strategies have different impact on the loss distribution and thus the efficiency of the flyback micro-inverter. Based on the loss analysis, a new hybrid control strategy combing the two-phase DCM and one-phase DCM control is proposed to improve the efficiency in wide load range by reducing the dominant losses depending on the load current. The experimental results verified the benefits of the proposed control.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"61 1","pages":"2433-2438"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90092588","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342176
N. Yousefpoor, B. Parkhideh, S. Bhattacharya
For power flow control with specific attention to renewable energy resources based transmission in a meshed network, less complex coordinated control can be obtained with the proposed convertible static transmission controller (CSTC) concept which is connected across the substation power transformer and can be reconfigured to the required modes of operation. Dual Series Static Compensator (DSSC) mode or series-series mode available in the CSTC provides superior performance in terms of operating characteristics compared to conventional power flow controllers. In this paper, detailed steady-state and dynamic performance of DSSC will be investigated, and the control structure of DSSC will be proposed to control active and reactive power independently. This paper specifically explores the challenges of the proposed control method. In particular, the proposed control structure is based on line current PLL. The dynamic performance of DSSC is further investigated in PSCAD/EMTDC environment.
{"title":"An approach to regulating Dual Series Static Compensator (DSSC)","authors":"N. Yousefpoor, B. Parkhideh, S. Bhattacharya","doi":"10.1109/ECCE.2012.6342176","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342176","url":null,"abstract":"For power flow control with specific attention to renewable energy resources based transmission in a meshed network, less complex coordinated control can be obtained with the proposed convertible static transmission controller (CSTC) concept which is connected across the substation power transformer and can be reconfigured to the required modes of operation. Dual Series Static Compensator (DSSC) mode or series-series mode available in the CSTC provides superior performance in terms of operating characteristics compared to conventional power flow controllers. In this paper, detailed steady-state and dynamic performance of DSSC will be investigated, and the control structure of DSSC will be proposed to control active and reactive power independently. This paper specifically explores the challenges of the proposed control method. In particular, the proposed control structure is based on line current PLL. The dynamic performance of DSSC is further investigated in PSCAD/EMTDC environment.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"47 1","pages":"4732-4737"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89418584","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342638
R. Khanna, W. Stanchina, G. Reed
The parasitic capacitances of GaN have been evaluated in order to assess the impact that each capacitance has on the switching losses of GaN devices. This required developing and validating equivalent GaN HFET device models in SaberRD and implementing the models in a switching test circuit under variable parasitic capacitance conditions. The data presented here can facilitate optimizing the area and hence capacitance of GaN devices for future generation power electronics.
{"title":"Effects of parasitic capacitances on gallium nitride heterostructure power transistors","authors":"R. Khanna, W. Stanchina, G. Reed","doi":"10.1109/ECCE.2012.6342638","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342638","url":null,"abstract":"The parasitic capacitances of GaN have been evaluated in order to assess the impact that each capacitance has on the switching losses of GaN devices. This required developing and validating equivalent GaN HFET device models in SaberRD and implementing the models in a switching test circuit under variable parasitic capacitance conditions. The data presented here can facilitate optimizing the area and hence capacitance of GaN devices for future generation power electronics.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"126 1","pages":"1489-1495"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75358279","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342385
D. Dong, D. Boroyevich, P. Mattavelli, B. Wen, Yaosuo Xue
This paper presents the islanding detection algorithms for three-phase (3Φ) grid-interface converters based on the grid synchronization small-signal stability. To study the grid synchronization behavior at the islanded condition, a low-frequency small-signal phase-locked-loop (PLL) model is proposed by considering the converter interaction with the system impedances. Many of the frequency-related behaviors can be well explained and the crucial system parameters which impact the PLL stability are quantified by the proposed model as well. Based on the model, two islanding detection algorithms based on the small-signal stability theory are proposed to effectively detect the islanding event under the worst loading condition. The proposed algorithms feature a small impact to the converter system operation as well as an easy implementation. Multi-disciplinenary comparison and the detailed design procedures are given.
{"title":"Anti-islanding protection in three-phase converters using grid synchronization small-signal stability","authors":"D. Dong, D. Boroyevich, P. Mattavelli, B. Wen, Yaosuo Xue","doi":"10.1109/ECCE.2012.6342385","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342385","url":null,"abstract":"This paper presents the islanding detection algorithms for three-phase (3Φ) grid-interface converters based on the grid synchronization small-signal stability. To study the grid synchronization behavior at the islanded condition, a low-frequency small-signal phase-locked-loop (PLL) model is proposed by considering the converter interaction with the system impedances. Many of the frequency-related behaviors can be well explained and the crucial system parameters which impact the PLL stability are quantified by the proposed model as well. Based on the model, two islanding detection algorithms based on the small-signal stability theory are proposed to effectively detect the islanding event under the worst loading condition. The proposed algorithms feature a small impact to the converter system operation as well as an easy implementation. Multi-disciplinenary comparison and the detailed design procedures are given.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"14 1","pages":"2712-2718"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75368331","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342556
L. Hadjidemetriou, E. Kyriakides, F. Blaabjerg
There is a need to develop new control strategies for interconnecting Renewable Energy Sources (RES) to the power system due to the ever increasing penetration of RES and in particular for wind power systems (WPS). The control strategies are typically based on a fast and accurate detection of the phase angle of the grid voltage which may be estimated by using a Phase-Locked Loop (PLL) control circuit. The performance of the PLL under normal and abnormal operational conditions is a crucial aspect, since the RES is desired to operate to support the power system under grid fault conditions. This paper investigates the performance of three different PLLs: a synchronous reference frame PLL (dqPLL), a stationary reference frame PLL (αβPLL), and a decoupled double synchronous reference frame PLL (ddsrfPLL). The results of this investigation motivate to the development of a new hybrid PLL which is a combination of the abovementioned PLLs and uses the advantages of each PLL. The proposed decoupled stationary reference frame PLL (dαβPLL) may be an appropriate solution to use in an interconnected RES with Ride Through Fault (RTF) capability, since it prevails the other PLLs with regards to its accuracy under unbalanced faults. Further, it has a lower deviation of the estimated phase after the fault occurs. The performance of the new hybrid dαβPLL is verified through simulations and experiments. Further the new PLL is used in an interconnected RES through experiments under normal and RTF operation.
{"title":"A new hybrid PLL for interconnecting Renewable Energy Systems to the grid","authors":"L. Hadjidemetriou, E. Kyriakides, F. Blaabjerg","doi":"10.1109/ECCE.2012.6342556","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342556","url":null,"abstract":"There is a need to develop new control strategies for interconnecting Renewable Energy Sources (RES) to the power system due to the ever increasing penetration of RES and in particular for wind power systems (WPS). The control strategies are typically based on a fast and accurate detection of the phase angle of the grid voltage which may be estimated by using a Phase-Locked Loop (PLL) control circuit. The performance of the PLL under normal and abnormal operational conditions is a crucial aspect, since the RES is desired to operate to support the power system under grid fault conditions. This paper investigates the performance of three different PLLs: a synchronous reference frame PLL (dqPLL), a stationary reference frame PLL (αβPLL), and a decoupled double synchronous reference frame PLL (ddsrfPLL). The results of this investigation motivate to the development of a new hybrid PLL which is a combination of the abovementioned PLLs and uses the advantages of each PLL. The proposed decoupled stationary reference frame PLL (dαβPLL) may be an appropriate solution to use in an interconnected RES with Ride Through Fault (RTF) capability, since it prevails the other PLLs with regards to its accuracy under unbalanced faults. Further, it has a lower deviation of the estimated phase after the fault occurs. The performance of the new hybrid dαβPLL is verified through simulations and experiments. Further the new PLL is used in an interconnected RES through experiments under normal and RTF operation.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"1 1","pages":"2075-2082"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75444518","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342770
Donghua Pan, X. Ruan, Xuehua Wang, Chenlei Bao, Weiwei Li
The LCL filter is widely used in grid-connected inverters due to its outstanding performance of attenuating the switching frequency current harmonics. An LCL filter has two individual inductors. Numbers of magnetic cores are required, and large volume has to be reserved for these two inductors. In order to reduce the core volume, magnetic integration of these two inductors is introduced in this paper. Since the attenuating ability of the LCL filter would be weakened by the coupling between the two inductors, decoupled magnetic integration is chosen consequently. Though the reluctance of the common core can hardly be zero, the decoupled magnetic integration scheme is still attractive. A 6-kW prototype is built in the lab, and the experimental results validate the effectiveness of the proposed magnetic integration scheme.
{"title":"Magnetic integration of an LCL filter for the single-phase grid-connected inverter","authors":"Donghua Pan, X. Ruan, Xuehua Wang, Chenlei Bao, Weiwei Li","doi":"10.1109/ECCE.2012.6342770","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342770","url":null,"abstract":"The LCL filter is widely used in grid-connected inverters due to its outstanding performance of attenuating the switching frequency current harmonics. An LCL filter has two individual inductors. Numbers of magnetic cores are required, and large volume has to be reserved for these two inductors. In order to reduce the core volume, magnetic integration of these two inductors is introduced in this paper. Since the attenuating ability of the LCL filter would be weakened by the coupling between the two inductors, decoupled magnetic integration is chosen consequently. Though the reluctance of the common core can hardly be zero, the decoupled magnetic integration scheme is still attractive. A 6-kW prototype is built in the lab, and the experimental results validate the effectiveness of the proposed magnetic integration scheme.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"145 1","pages":"573-578"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75656514","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 : 2012-11-12DOI: 10.1109/ECCE.2012.6342717
S. Ngu, D. Dorrell, C. Cossar
This paper describes the operation of a direct-drive brushless generator for a Bristol cylinder ocean wave device. This is a very low speed device so the pole number and diameter is very large. While the machine may be large the pole pitch and axial length is low. The application is described and simulated using analytical and finite element analysis techniques. A 248 pole design with surface rotor magnets is developed with both surface and slotted windings. An analysis of the control is put forward.
{"title":"Design and operation of very slow-speed generators for a Bristol cylinder sea wave generating device","authors":"S. Ngu, D. Dorrell, C. Cossar","doi":"10.1109/ECCE.2012.6342717","DOIUrl":"https://doi.org/10.1109/ECCE.2012.6342717","url":null,"abstract":"This paper describes the operation of a direct-drive brushless generator for a Bristol cylinder ocean wave device. This is a very low speed device so the pole number and diameter is very large. While the machine may be large the pole pitch and axial length is low. The application is described and simulated using analytical and finite element analysis techniques. A 248 pole design with surface rotor magnets is developed with both surface and slotted windings. An analysis of the control is put forward.","PeriodicalId":6401,"journal":{"name":"2012 IEEE Energy Conversion Congress and Exposition (ECCE)","volume":"39 1","pages":"946-953"},"PeriodicalIF":0.0,"publicationDate":"2012-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75698786","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：