Pub Date : 2009-12-11DOI: 10.1109/INTLEC.2009.5351855
Sihun Yang, S. Abe, M. Shoyama
This paper presents the design and implementation of LLC resonant converter using planar magnetic component. In the LLC resonant converter, ZVS turn-on and ZCS turn-off of MOSFETs and diode rectifiers can be achieved over the entire operating range, respectively. Therefore, the switching loss is reduced and we can operate the converter at higher switching frequency. At that frequency, planar magnetic component is a viable option. In this proposed converter, the magnetic component is integrated into advanced power conversion technique to implement a low-profile power supply for PDP application systems. An efficiency of about 96.7% was obtained.
{"title":"Design of LLC resonant converter using planar magnetic component","authors":"Sihun Yang, S. Abe, M. Shoyama","doi":"10.1109/INTLEC.2009.5351855","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351855","url":null,"abstract":"This paper presents the design and implementation of LLC resonant converter using planar magnetic component. In the LLC resonant converter, ZVS turn-on and ZCS turn-off of MOSFETs and diode rectifiers can be achieved over the entire operating range, respectively. Therefore, the switching loss is reduced and we can operate the converter at higher switching frequency. At that frequency, planar magnetic component is a viable option. In this proposed converter, the magnetic component is integrated into advanced power conversion technique to implement a low-profile power supply for PDP application systems. An efficiency of about 96.7% was obtained.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114354574","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.2009.5351753
S. Hosseini, A. K. Sadigh, M. Farasat
In this paper a new 2-cell shunt active power filter (APF) is proposed. The proposed APF is capable of eliminating current harmonics and compensating reactive current, drawn by both nonlinear and linear loads. An online control method based on the discrete nonlinear model of multicell inverters is applied to APF. The main idea of the controller is the “tracking problem” of the reference current and the reference capacitor voltage by state variables. The state variables are controlled using an optimal feedback in a very fast and efficient manner. Moreover, a novel extraction system based on the synchronous reference frame is adopted as a part of the control system, and provides the required signals for harmonic filtering and reactive power compensation. The compensation principle is presented in details. The circuit is simulated using PSCAD/EMTDC software and simulation results are presented to validate the effectiveness of the novel control scheme and proposed APF.
{"title":"A new 2-cell shunt active power filter with compensation principle based on synchronous reference frame","authors":"S. Hosseini, A. K. Sadigh, M. Farasat","doi":"10.1109/INTLEC.2009.5351753","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351753","url":null,"abstract":"In this paper a new 2-cell shunt active power filter (APF) is proposed. The proposed APF is capable of eliminating current harmonics and compensating reactive current, drawn by both nonlinear and linear loads. An online control method based on the discrete nonlinear model of multicell inverters is applied to APF. The main idea of the controller is the “tracking problem” of the reference current and the reference capacitor voltage by state variables. The state variables are controlled using an optimal feedback in a very fast and efficient manner. Moreover, a novel extraction system based on the synchronous reference frame is adopted as a part of the control system, and provides the required signals for harmonic filtering and reactive power compensation. The compensation principle is presented in details. The circuit is simulated using PSCAD/EMTDC software and simulation results are presented to validate the effectiveness of the novel control scheme and proposed APF.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115481422","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.2009.5351784
J. Rhee, Dong-Seok Lim, Sam-Young Chung
Following the effectuation of Kyoto Protocol in 2005, global warming began to receive a lot of attention worldwide and the role of green IT in reducing greenhouse gas (GHG) has become an important global issue. Korea, a late starter in this business, has also implemented several strategies and policies mostly led by government. However, there is currently no inventory system in Korean telecommunication sector that can categorize the GHG sinks/emission sources and emission amount/removed amount and manage them during the total procedure. Hence, this paper examines the green IT activities of developed countries and available inventory guidelines, with a purpose of suggesting direction for establishing inventory that fits the domestic situation. Such inventory system will contribute to building a fundamental stone for low carbon green growth in Korea and expanding Korean green IT technological share in global market.
{"title":"A proposal of GHG inventory implementation for telecommunication sector in Korea","authors":"J. Rhee, Dong-Seok Lim, Sam-Young Chung","doi":"10.1109/INTLEC.2009.5351784","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351784","url":null,"abstract":"Following the effectuation of Kyoto Protocol in 2005, global warming began to receive a lot of attention worldwide and the role of green IT in reducing greenhouse gas (GHG) has become an important global issue. Korea, a late starter in this business, has also implemented several strategies and policies mostly led by government. However, there is currently no inventory system in Korean telecommunication sector that can categorize the GHG sinks/emission sources and emission amount/removed amount and manage them during the total procedure. Hence, this paper examines the green IT activities of developed countries and available inventory guidelines, with a purpose of suggesting direction for establishing inventory that fits the domestic situation. Such inventory system will contribute to building a fundamental stone for low carbon green growth in Korea and expanding Korean green IT technological share in global market.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123714774","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.2009.5351818
Tae-Hyoung Kim, Dong-Hee Lee, Jin-Woo Ahn
In this paper, an advanced torque control scheme of SRM(Switched Reluctance Motor) using modified non-linear logical TSF(Torque Sharing Function) based on the DITC(Direct Instantaneous Torque Control) with PWM(Pulse width modulation) is presented. The proposed torque controller uses the non-linear logical TSF and switching rules which realized by DITC, however the switching period is calculated by the torque error. Therefore a simple calculation of non-linear logical TSF and DITC with PWM can be reduce the torque ripple with fixed switching frequency. The proposed control scheme is verified by the computer simulations and experimental results.
{"title":"Advanced non-linear logic torque sharing function of SRM for torque ripple reduction","authors":"Tae-Hyoung Kim, Dong-Hee Lee, Jin-Woo Ahn","doi":"10.1109/INTLEC.2009.5351818","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351818","url":null,"abstract":"In this paper, an advanced torque control scheme of SRM(Switched Reluctance Motor) using modified non-linear logical TSF(Torque Sharing Function) based on the DITC(Direct Instantaneous Torque Control) with PWM(Pulse width modulation) is presented. The proposed torque controller uses the non-linear logical TSF and switching rules which realized by DITC, however the switching period is calculated by the torque error. Therefore a simple calculation of non-linear logical TSF and DITC with PWM can be reduce the torque ripple with fixed switching frequency. The proposed control scheme is verified by the computer simulations and experimental results.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124471781","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.2009.5351807
E. Sakai, M. Nakahara
The output voltage of DC-DC converter contains the ripple and it substantially affects the frequency response although the ripple is usually neglected in the control circuit as PWM control. The authors already have clarified that the effect of the ripple is not ignorable for the frequency response and it causes the unusual characteristics. In this paper, we analyze the effect of the ripple in consideration of ESR of the output capacitor of the boost converter. As a result it has been found that the effect of ESR in the stability is different according to the shape of the slope direction of the ramp generator in the PWM circuit.
{"title":"Effect of ripple on frequency response characteristics of boost converter - Analysis in consideration of ESR of output capacitor -","authors":"E. Sakai, M. Nakahara","doi":"10.1109/INTLEC.2009.5351807","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351807","url":null,"abstract":"The output voltage of DC-DC converter contains the ripple and it substantially affects the frequency response although the ripple is usually neglected in the control circuit as PWM control. The authors already have clarified that the effect of the ripple is not ignorable for the frequency response and it causes the unusual characteristics. In this paper, we analyze the effect of the ripple in consideration of ESR of the output capacitor of the boost converter. As a result it has been found that the effect of ESR in the stability is different according to the shape of the slope direction of the ramp generator in the PWM circuit.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121993865","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":null,"pages":null},"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.2009.5351996
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":null,"pages":null},"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.2009.5352087
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":null,"pages":null},"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.2009.5351859
Ki-Bum Park, Chong-Eun Kim, G. Moon, M. Youn
A classical boost converter has a limited voltage step-up ratio because of its parasitic resistances, which does not make it suitable for high step-up applications. Therefore, to obtain a high step-up capability with high efficiency, non-isolated high step-up technique based on isolated type converters is introduced in this paper. By stacking the secondary sides in addition to the primary side, high step-up conversion ratio can be achieved. Moreover, a careful choice isolated converter provides zero-voltage-switching (ZVS), low voltage stress on devices, and continuous input current. The operational principle and characteristics of proposed converter are presented, and verified experimentally with a 140-W, 24-Vdc input, 150∼250-Vdc output prototype converter for a LED driver.
{"title":"Non-isolated high step-up converter based on boost integrated half-bridge converter","authors":"Ki-Bum Park, Chong-Eun Kim, G. Moon, M. Youn","doi":"10.1109/INTLEC.2009.5351859","DOIUrl":"https://doi.org/10.1109/INTLEC.2009.5351859","url":null,"abstract":"A classical boost converter has a limited voltage step-up ratio because of its parasitic resistances, which does not make it suitable for high step-up applications. Therefore, to obtain a high step-up capability with high efficiency, non-isolated high step-up technique based on isolated type converters is introduced in this paper. By stacking the secondary sides in addition to the primary side, high step-up conversion ratio can be achieved. Moreover, a careful choice isolated converter provides zero-voltage-switching (ZVS), low voltage stress on devices, and continuous input current. The operational principle and characteristics of proposed converter are presented, and verified experimentally with a 140-W, 24-Vdc input, 150∼250-Vdc output prototype converter for a LED driver.","PeriodicalId":445164,"journal":{"name":"INTELEC 2009 - 31st International Telecommunications Energy Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125190965","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":null,"pages":null},"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}
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