Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5352087
S. Iwai, Teruaki Kono, M. Hashiwaki, Y. Kawagoe
Companies need power to be continuously supplied to be able to operate. As a long-term blackout in which emergency generators fail leads to mission critical systems being shutdown, we have to keep generators available at all times. However, building owners face considerable difficulties in installing redundant generators in term of cost, installation space, and local regulations. Without redundant generators we can neither replace nor overhaul generators in buildings that house mission critical systems. Mobile generators, which combine both mobility and large capacity, allow generators to be replaced or maintained in buildings with no back-up generator. We at NTT Facilities present solutions for failed generators: the use of a mobile engine generator. These generators are truck-mounted ones with a large capacity. They are not only used as a backup power during emergencies, but are also used as backup power for when the engine generators are being overhauled or replaced. We use reliability models and case studies to show how mobile engine generators ensure business continuity.
{"title":"Use of mobile engine generators as source of back-up power","authors":"S. Iwai, Teruaki Kono, M. Hashiwaki, Y. Kawagoe","doi":"10.1109/INTLEC.2009.5352087","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5352087","url":null,"abstract":"Companies need power to be continuously supplied to be able to operate. As a long-term blackout in which emergency generators fail leads to mission critical systems being shutdown, we have to keep generators available at all times. However, building owners face considerable difficulties in installing redundant generators in term of cost, installation space, and local regulations. Without redundant generators we can neither replace nor overhaul generators in buildings that house mission critical systems. Mobile generators, which combine both mobility and large capacity, allow generators to be replaced or maintained in buildings with no back-up generator. We at NTT Facilities present solutions for failed generators: the use of a mobile engine generator. These generators are truck-mounted ones with a large capacity. They are not only used as a backup power during emergencies, but are also used as backup power for when the engine generators are being overhauled or replaced. We use reliability models and case studies to show how mobile engine generators ensure business continuity.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123942445","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351860
K. Orikawa, J. Itoh
This paper proposes a novel DC-DC converter for hybrid power supplies using both fuel cell and battery. The output voltage is controlled by a series converter that regulates only the differential voltage between the fuel cell voltage and the output voltage. Although the load condition is changed, the variation of the fuel cell current is suppressed by a battery through operation of the parallel converter. The experimental results confirmed that the proposed circuit could achieve maximum efficiency point of 98.8% in the small differential voltage region. In addition, the loss analysis clarified the relations among the ripple current of the inductors, the inductor voltage and the inductors losses. As a result, it is confirmed that the proposed circuit achieves the minimum loss of the copper loss and the iron loss in the inductors when the differential voltage is small.
{"title":"Loss evaluation of a series-parallel compensation DC-DC converter for a small fuel cell system","authors":"K. Orikawa, J. Itoh","doi":"10.1109/INTLEC.2009.5351860","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351860","url":null,"abstract":"This paper proposes a novel DC-DC converter for hybrid power supplies using both fuel cell and battery. The output voltage is controlled by a series converter that regulates only the differential voltage between the fuel cell voltage and the output voltage. Although the load condition is changed, the variation of the fuel cell current is suppressed by a battery through operation of the parallel converter. The experimental results confirmed that the proposed circuit could achieve maximum efficiency point of 98.8% in the small differential voltage region. In addition, the loss analysis clarified the relations among the ripple current of the inductors, the inductor voltage and the inductors losses. As a result, it is confirmed that the proposed circuit achieves the minimum loss of the copper loss and the iron loss in the inductors when the differential voltage is small.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125445494","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351792
Byeong-Hwa Lee, Jeong-Jong Lee, Sung-Il Kim, S. Kwon, Jung-Pyo Hong
This paper deals with a design approach to an interior permanent magnet synchronous motor (IPMSM) used in in-wheel motor drive systems of electric vehicles. The approach is divided into three parts overall. First, the constant power region of IPMSM and gear ratio are investigated in order to meet the specifications of the in-wheel motor system. Second, the range of inductance and back-EMF to satisfy the given design conditions of the IPMSM is estimated. Finally, the preliminary geometry satisfying the range is decided by PM type, current density, and fill factor and so on, and then the detailed design is carried out by means of finite element analysis in consideration of magnetic saturation.
{"title":"Development of an IPMSM for in-wheel type electric vehicles","authors":"Byeong-Hwa Lee, Jeong-Jong Lee, Sung-Il Kim, S. Kwon, Jung-Pyo Hong","doi":"10.1109/INTLEC.2009.5351792","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351792","url":null,"abstract":"This paper deals with a design approach to an interior permanent magnet synchronous motor (IPMSM) used in in-wheel motor drive systems of electric vehicles. The approach is divided into three parts overall. First, the constant power region of IPMSM and gear ratio are investigated in order to meet the specifications of the in-wheel motor system. Second, the range of inductance and back-EMF to satisfy the given design conditions of the IPMSM is estimated. Finally, the preliminary geometry satisfying the range is decided by PM type, current density, and fill factor and so on, and then the detailed design is carried out by means of finite element analysis in consideration of magnetic saturation.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122516109","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5352028
W. Choi, Sung-Geun Song, Sung‐Jun Park, K. Kim, Y. Lim
A high efficiency photovoltaic (PV) module integrated converter (MIC) system is proposed. The proposed system consists of a high step-up dc-dc converter and a single-phase full-bridge inverter. The proposed step-up dc-dc converter has a high efficiency and low-profile. An input ripple current reduction control is suggested to reduce the low frequency ripple current generated by the full-bridge inverter. Overall power efficiency of 95 % was obtained at 260 W output power for 36 V PV voltage with ripple current within 3 % of the rated input current.
{"title":"Photovoltaic module integrated converter system minimizing input ripple current for inverter load","authors":"W. Choi, Sung-Geun Song, Sung‐Jun Park, K. Kim, Y. Lim","doi":"10.1109/INTLEC.2009.5352028","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5352028","url":null,"abstract":"A high efficiency photovoltaic (PV) module integrated converter (MIC) system is proposed. The proposed system consists of a high step-up dc-dc converter and a single-phase full-bridge inverter. The proposed step-up dc-dc converter has a high efficiency and low-profile. An input ripple current reduction control is suggested to reduce the low frequency ripple current generated by the full-bridge inverter. Overall power efficiency of 95 % was obtained at 260 W output power for 36 V PV voltage with ripple current within 3 % of the rated input current.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130682986","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351900
Jong-Ha Park, Hoon Kim, Heejun Kim
This paper presents a current-mode control non-inverting buck-boost converter. The proposed circuit is controlled by the current mode and operated in three operation modes which are buck, buck-boost, and boost mode. The operation mode is automatically determined by the ratio between the input and output voltages. The proposed circuit is simulated by HSPICE with 0.5 um standard CMOS parameters. Its input voltage range is 2.5–5 V, and the output voltage range is 1.5–5 V. The maximum efficiency is 92% when it operates in buck mode.
提出了一种电流型控制非反相降压-升压变换器。该电路由电流模式控制，并在降压、降压升压和升压三种工作模式下工作。工作模式由输入输出电压的比值自动确定。采用HSPICE对该电路进行了仿真，并采用0.5 um标准CMOS参数。其输入电压范围为2.5 V ~ 5v，输出电压范围为1.5 V ~ 5v。当它在降压模式下工作时，最高效率为92%。
{"title":"A current-mode non-inverting CMOS buck-boost DC-DC converter","authors":"Jong-Ha Park, Hoon Kim, Heejun Kim","doi":"10.1109/INTLEC.2009.5351900","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351900","url":null,"abstract":"This paper presents a current-mode control non-inverting buck-boost converter. The proposed circuit is controlled by the current mode and operated in three operation modes which are buck, buck-boost, and boost mode. The operation mode is automatically determined by the ratio between the input and output voltages. The proposed circuit is simulated by HSPICE with 0.5 um standard CMOS parameters. Its input voltage range is 2.5–5 V, and the output voltage range is 1.5–5 V. The maximum efficiency is 92% when it operates in buck mode.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128161812","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351876
Hyosang Jang, Taeyoung Ahn, B. Choi
This paper presents new soft-switched half-bridge dc-to-dc converters intended for applications where the input voltage varies widely. The proposed converters are presented in both non-isolated form and isolated form. The proposed dc-to-dc converters operate with zero voltage switching characteristics for MOSFET switches. The duty ratio of the proposed converter could expand to 100 % and its voltage gain is twice the voltage gain of conventional half-bridge converters. Accordingly, the proposed converters are well suited for applications requiring high conversion efficiency at the presence of wide input voltage variations. The operation and performance of the proposed converters are demonstrated with experimental converters that deliver a 12V/5A output from a 35–60 V input. The non-isolated converter recorded the maximum efficiency of 91 % at 1.5 A load current.
{"title":"New half-bridge dc-to-dc converters for wide input voltage applications","authors":"Hyosang Jang, Taeyoung Ahn, B. Choi","doi":"10.1109/INTLEC.2009.5351876","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351876","url":null,"abstract":"This paper presents new soft-switched half-bridge dc-to-dc converters intended for applications where the input voltage varies widely. The proposed converters are presented in both non-isolated form and isolated form. The proposed dc-to-dc converters operate with zero voltage switching characteristics for MOSFET switches. The duty ratio of the proposed converter could expand to 100 % and its voltage gain is twice the voltage gain of conventional half-bridge converters. Accordingly, the proposed converters are well suited for applications requiring high conversion efficiency at the presence of wide input voltage variations. The operation and performance of the proposed converters are demonstrated with experimental converters that deliver a 12V/5A output from a 35–60 V input. The non-isolated converter recorded the maximum efficiency of 91 % at 1.5 A load current.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128045905","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5352091
T. Sun, S. Kwon, Jeong-Jong Lee, Jung-Pyo Hong
This paper studies the influence of permanent magnet on the total system efficiency of permanent magnet synchronous motors (PMSM). Two PMSM with Nd-Fe-B and Ferrite magnets which have same Back-EMF and output power have been designed. First, the dynamic simulation is performed with these two motors' parameters. The current waveforms and switching losses of transistors can be evaluated. And then, by means of the obtained current waveforms and a series of numerical methods, the iron losses of these two motors will be calculated. Finally, comparing the sum of the switching losses and iron losses, the result can be used to reflect the influence of the magnet on the total motor system efficiency.
{"title":"Investigation and comparison of system efficiency on the PMSM considering Nd-Fe-B magnet and Ferrite magnet","authors":"T. Sun, S. Kwon, Jeong-Jong Lee, Jung-Pyo Hong","doi":"10.1109/INTLEC.2009.5352091","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5352091","url":null,"abstract":"This paper studies the influence of permanent magnet on the total system efficiency of permanent magnet synchronous motors (PMSM). Two PMSM with Nd-Fe-B and Ferrite magnets which have same Back-EMF and output power have been designed. First, the dynamic simulation is performed with these two motors' parameters. The current waveforms and switching losses of transistors can be evaluated. And then, by means of the obtained current waveforms and a series of numerical methods, the iron losses of these two motors will be calculated. Finally, comparing the sum of the switching losses and iron losses, the result can be used to reflect the influence of the magnet on the total motor system efficiency.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125788482","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351927
Jong-Soo Kim, Gyu-Yeong Choe, Byoung-Kuk Lee, D. Oh, Jin-Wook Kim, Jae-Sun Shim
In this paper, in order to design an optimal power conditioning system (PCS) for fuel cell (FC) application, nonlinear and dynamic characteristics of fuel cell are modeled. And design considerations, such as power semiconductor switches, capacitor and inductor, for optimal design of FC-PCS are deduced form comparative analysis of ideal dc source and fuel cell characteristic model. And co-simulation of FC-PCS is then performed by using developed model with input condition of PCS. Through analysis and co-simulation results, optimal design methodology of PCS for fuel cell is provided.
{"title":"Optimal design methodology for FC-PCS using fuel cell simulator","authors":"Jong-Soo Kim, Gyu-Yeong Choe, Byoung-Kuk Lee, D. Oh, Jin-Wook Kim, Jae-Sun Shim","doi":"10.1109/INTLEC.2009.5351927","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351927","url":null,"abstract":"In this paper, in order to design an optimal power conditioning system (PCS) for fuel cell (FC) application, nonlinear and dynamic characteristics of fuel cell are modeled. And design considerations, such as power semiconductor switches, capacitor and inductor, for optimal design of FC-PCS are deduced form comparative analysis of ideal dc source and fuel cell characteristic model. And co-simulation of FC-PCS is then performed by using developed model with input condition of PCS. Through analysis and co-simulation results, optimal design methodology of PCS for fuel cell is provided.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121617331","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351996
Jeong-Jong Lee, S. Kwon, Jung-Pyo Hong, Ji-hyun Kim, K. Ha
This paper presents core loss analysis of 3-phase induction motors used for industry applications. The core loss is affected by the time rate of the change of magnetic flux density. Generally core loss is spread out in stator and rotor core. And, rotor core toss is less than stator core because of constant field flux density of rotor. Tooth core loss density is large than yoke core loss because tooth has harmonic distortion of flux density. In this paper, transient finite element method used to analyze the magnetic flux density waveform in order to analysis the flux density according to varying time. Core losses in each element are evaluated using core loss curve tested by and Epstein test apparatus. Its result is shown the distribution of core loss density and partial thermal source.
{"title":"Core loss distribution of three-phase induction motor using numerical method","authors":"Jeong-Jong Lee, S. Kwon, Jung-Pyo Hong, Ji-hyun Kim, K. Ha","doi":"10.1109/INTLEC.2009.5351996","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351996","url":null,"abstract":"This paper presents core loss analysis of 3-phase induction motors used for industry applications. The core loss is affected by the time rate of the change of magnetic flux density. Generally core loss is spread out in stator and rotor core. And, rotor core toss is less than stator core because of constant field flux density of rotor. Tooth core loss density is large than yoke core loss because tooth has harmonic distortion of flux density. In this paper, transient finite element method used to analyze the magnetic flux density waveform in order to analysis the flux density according to varying time. Core losses in each element are evaluated using core loss curve tested by and Epstein test apparatus. Its result is shown the distribution of core loss density and partial thermal source.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122727302","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 : 2009-12-11DOI: 10.1109/INTLEC.2009.5351750
T. Harimoto, Hidemi Hayashi, K. Murata
The authors have devised a novel PWM control scheme capable of controlling a designated order harmonic while other low harmonic components are eliminated, based on the conventional low harmonic component elimination PWM control scheme. And it experimentally proved that the harmonic voltage in power systems could be suppressed, by means of controlling a self-commutated rectifier as a shunt active filter based on voltage detection.
{"title":"An investigation of method to reduce harmonic components in large-scale self-commutated inverter","authors":"T. Harimoto, Hidemi Hayashi, K. Murata","doi":"10.1109/INTLEC.2009.5351750","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351750","url":null,"abstract":"The authors have devised a novel PWM control scheme capable of controlling a designated order harmonic while other low harmonic components are eliminated, based on the conventional low harmonic component elimination PWM control scheme. And it experimentally proved that the harmonic voltage in power systems could be suppressed, by means of controlling a self-commutated rectifier as a shunt active filter based on voltage detection.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126216440","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：