Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572423
M. Noritake, K. Yuasa, T. Takeda, K. Shimomachi, R. Hara, H. Kita, T. Matsumura
This paper reports the experimental study of a 400 V class DC microgrid for an office building that has been constructed in Obihiro City, Hokkaido, Japan. The objective of this study is to develop a self-sustained distributed energy system by combining distribution energies, batteries, and appliances with DC power. This new DC energy system not only reduces the environment load and improves energy efficiency but also forms a community energy system that can become independent from utility grids and resistant to natural disasters. We have found that compared with AC power supply, the DC system, which uses power generated by solar panels as is, decreases CO2 emission more than 10%.
{"title":"The demonstration of the CO2 reduction effect of 400V class DC micro grid for offices","authors":"M. Noritake, K. Yuasa, T. Takeda, K. Shimomachi, R. Hara, H. Kita, T. Matsumura","doi":"10.1109/INTLEC.2015.7572423","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572423","url":null,"abstract":"This paper reports the experimental study of a 400 V class DC microgrid for an office building that has been constructed in Obihiro City, Hokkaido, Japan. The objective of this study is to develop a self-sustained distributed energy system by combining distribution energies, batteries, and appliances with DC power. This new DC energy system not only reduces the environment load and improves energy efficiency but also forms a community energy system that can become independent from utility grids and resistant to natural disasters. We have found that compared with AC power supply, the DC system, which uses power generated by solar panels as is, decreases CO2 emission more than 10%.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130550035","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572362
K. Kajiwara, F. Kurokawa, H. Maruta, Y. Shibata, K. Hirose
The purpose of this paper is to present the digital peak current mode phase-shifted full-bridge zero volt switching dc-dc converter for the data center in the higher voltage direct current (HVDC) system, and show its transient response. The proposed peak current mode control circuit is composed of the RC integrator and comparator only and can detect the peak current in real time. At first, the basic operation of proposed method is confirmed by using the buck type dc-dc converter. Furthermore, the proposed method is applied to the prototype of 380V phase-shifted full-bridge zero volt switching dc-dc converter. The system has to be always stable in the transient response even if the input voltage is changed. As a result, the convergence time of output voltage is improved by about 50% compared with the conventional digital voltage mode control when the input voltage is 380V and 300V.
{"title":"Digital peak current mode DC-DC converter for data center in HVDC system","authors":"K. Kajiwara, F. Kurokawa, H. Maruta, Y. Shibata, K. Hirose","doi":"10.1109/INTLEC.2015.7572362","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572362","url":null,"abstract":"The purpose of this paper is to present the digital peak current mode phase-shifted full-bridge zero volt switching dc-dc converter for the data center in the higher voltage direct current (HVDC) system, and show its transient response. The proposed peak current mode control circuit is composed of the RC integrator and comparator only and can detect the peak current in real time. At first, the basic operation of proposed method is confirmed by using the buck type dc-dc converter. Furthermore, the proposed method is applied to the prototype of 380V phase-shifted full-bridge zero volt switching dc-dc converter. The system has to be always stable in the transient response even if the input voltage is changed. As a result, the convergence time of output voltage is improved by about 50% compared with the conventional digital voltage mode control when the input voltage is 380V and 300V.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116597794","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572402
F. Kurokawa, S. Hattori
A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components. The proposed approach achieves the high efficiency from the light load to heavy load conditions. It also achieves the high power factor at the full load condition. In this paper, the feasibility and practical value of the proposed approach are verified by the experimental results from a 0.8kW / 1.6kW products prototype.
{"title":"Single stage AD-DC full-bridge converter for battery charger","authors":"F. Kurokawa, S. Hattori","doi":"10.1109/INTLEC.2015.7572402","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572402","url":null,"abstract":"A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components. The proposed approach achieves the high efficiency from the light load to heavy load conditions. It also achieves the high power factor at the full load condition. In this paper, the feasibility and practical value of the proposed approach are verified by the experimental results from a 0.8kW / 1.6kW products prototype.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129870119","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572394
Andrew J. Dickson, V. Gonçalves, S. Robinson, D. Cassidy
This paper discusses the common Line Powering standards for safety with their advantages and their drawbacks. It also discusses the effects of electrical shock and risk of ventricular fibrillation on humans and the two types of faults that can occur with RFT-V line powering. Based on the standards for the effects of current on human beings and livestock, two flowcharts are developed to help unify a method to gauge the safety of RFT-V line powering products. An Excel tool is introduced to assist in the calculating and plotting of the test results from the flowchart. Example waveforms are given from a typical RFT-V product that illustrates the relative risk of ventricular fibrillation. It is concluded that based on the information provided in this paper that RFT-V power topologies will have a low risk of electrocution caused by ventricular fibrillation. Future work discusses how the future safety standards may evolve.
{"title":"The evolution of remote line powering safety standards for facilitating the transmission of elevated dc voltages over twisted pair","authors":"Andrew J. Dickson, V. Gonçalves, S. Robinson, D. Cassidy","doi":"10.1109/INTLEC.2015.7572394","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572394","url":null,"abstract":"This paper discusses the common Line Powering standards for safety with their advantages and their drawbacks. It also discusses the effects of electrical shock and risk of ventricular fibrillation on humans and the two types of faults that can occur with RFT-V line powering. Based on the standards for the effects of current on human beings and livestock, two flowcharts are developed to help unify a method to gauge the safety of RFT-V line powering products. An Excel tool is introduced to assist in the calculating and plotting of the test results from the flowchart. Example waveforms are given from a typical RFT-V product that illustrates the relative risk of ventricular fibrillation. It is concluded that based on the information provided in this paper that RFT-V power topologies will have a low risk of electrocution caused by ventricular fibrillation. Future work discusses how the future safety standards may evolve.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132198633","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572471
I. Colak, R. Bayindir, Mohammed Al-Nussari, Eklas Hossain
Microgrid is a single controllable unit constituting distributed generation (DG) and load in the power system. The micro source includes photovoltaic (PV) cells, wind turbine, micro turbine, fuel cell, electric accumulator and flywheel etc. Usually, the micro source operates in parallel with the normal distributed network that uses the power electronic devices. There are two typical operation modes of micro grid as the grid-connected mode and islanding mode. Thus, the running control problem is one key issue of the microgrid, which needs to be resolved in the actual operation. For exact synchronism, to protect the system and to reduce the load in case of imbalance condition, a control system is necessary to bring the system instability while providing efficient and robust electricity to the micro grid. This paper mainly analyses the micro sources with different types of loads and dispersion characteristics in different operating mode using droop control method.
{"title":"Voltage and frequency stability analysis of AC microgrid","authors":"I. Colak, R. Bayindir, Mohammed Al-Nussari, Eklas Hossain","doi":"10.1109/INTLEC.2015.7572471","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572471","url":null,"abstract":"Microgrid is a single controllable unit constituting distributed generation (DG) and load in the power system. The micro source includes photovoltaic (PV) cells, wind turbine, micro turbine, fuel cell, electric accumulator and flywheel etc. Usually, the micro source operates in parallel with the normal distributed network that uses the power electronic devices. There are two typical operation modes of micro grid as the grid-connected mode and islanding mode. Thus, the running control problem is one key issue of the microgrid, which needs to be resolved in the actual operation. For exact synchronism, to protect the system and to reduce the load in case of imbalance condition, a control system is necessary to bring the system instability while providing efficient and robust electricity to the micro grid. This paper mainly analyses the micro sources with different types of loads and dispersion characteristics in different operating mode using droop control method.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129435904","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572499
Hsin-Che Hsieh, Jing-Yuan Lin, Y. Hsieh, H. Chiu
In this paper, a 500 W, 400 V to 48 wireless power transfer system for vehicle battery charging is analyzed, designed and implemented. Series-series resonant topology is used due to ease of analyze and control. The secondary bridge rectifier is replaced by a sync rectifier consists of four MOSFET in a full bridge configuration in order to reduce conduction losses on rectifier. An efficiency of 92.7% at half load to full load is achieved with the proposed design.
{"title":"High-efficiency wireless power transfer system","authors":"Hsin-Che Hsieh, Jing-Yuan Lin, Y. Hsieh, H. Chiu","doi":"10.1109/INTLEC.2015.7572499","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572499","url":null,"abstract":"In this paper, a 500 W, 400 V to 48 wireless power transfer system for vehicle battery charging is analyzed, designed and implemented. Series-series resonant topology is used due to ease of analyze and control. The secondary bridge rectifier is replaced by a sync rectifier consists of four MOSFET in a full bridge configuration in order to reduce conduction losses on rectifier. An efficiency of 92.7% at half load to full load is achieved with the proposed design.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129741219","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572266
Tsai-Fu Wu, Tin Chang, Chih Chang, L. Lin
This paper presents design and implementation of a dc/dc converter with division-summation (D-Σ) digital control. With the control, the converter is allowed to have wide inductance variation caused by high current flowing through inductor, and to track current reference precisely for achieving tight output voltage regulation. Moreover, the control can reduce steady-state error as compared with peak current-mode control and achieve faster dynamic response over average current-mode control. This paper also presents a precise current reference calculation to avoid sub-harmonic oscillation of inductor current under discontinuous conduction mode. Experimental results have verified the analysis and discussion.
{"title":"Design and implementation of step-down converter with D-Σ digital control","authors":"Tsai-Fu Wu, Tin Chang, Chih Chang, L. Lin","doi":"10.1109/INTLEC.2015.7572266","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572266","url":null,"abstract":"This paper presents design and implementation of a dc/dc converter with division-summation (D-Σ) digital control. With the control, the converter is allowed to have wide inductance variation caused by high current flowing through inductor, and to track current reference precisely for achieving tight output voltage regulation. Moreover, the control can reduce steady-state error as compared with peak current-mode control and achieve faster dynamic response over average current-mode control. This paper also presents a precise current reference calculation to avoid sub-harmonic oscillation of inductor current under discontinuous conduction mode. Experimental results have verified the analysis and discussion.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114486524","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572431
T. Akagi, S. Abe, Masanobu Hatanaka, S. Matsumoto
This paper proposes an isolated DC-DC converter for Power-Supply on chip (SoC) realized by the couple of air-core coils. The pro-posed isolated DC-DC converter is evaluated by numerical simulations and experimental results. The fabricated prototype DC-DC converter works well and the simulation results are good agreement with experimental results. This paper also discusses the potential of proposed DC-DC converter for power SoC applications based on numerical simulation and experimental results.
{"title":"An isolated DC-DC converter using air-core inductor for power supply on chip applications","authors":"T. Akagi, S. Abe, Masanobu Hatanaka, S. Matsumoto","doi":"10.1109/INTLEC.2015.7572431","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572431","url":null,"abstract":"This paper proposes an isolated DC-DC converter for Power-Supply on chip (SoC) realized by the couple of air-core coils. The pro-posed isolated DC-DC converter is evaluated by numerical simulations and experimental results. The fabricated prototype DC-DC converter works well and the simulation results are good agreement with experimental results. This paper also discusses the potential of proposed DC-DC converter for power SoC applications based on numerical simulation and experimental results.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134065470","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572469
N. Okada, M. Hojo, K. Yamanaka
In recent years, dc power supply system has been increasingly attracting attention, because a solar power system and a storage battery trade their power by dc. A concept of HVDC Tap (High Voltage DC Tap) is known as an interesting method to build the dc power supply system. However, the circuit causes a high voltage ripple on the dc line and its transformer is afraid to be saturated by a dc bias magnetism. Authors have proposed to reduce the voltage ripple by employing double dc voltage taps in series with the dc line. In this paper, an improved dc voltage tap is proposed to prevent for the transformer from magnetic saturation. As one of its useful applications, this paper introduces a multi-ended dc power supply system with the double dc voltage taps and verifies its operating characteristics in case of balanced or unbalanced load conditions.
{"title":"A novel concept of DC voltage taps for multi-ended DC power supply system","authors":"N. Okada, M. Hojo, K. Yamanaka","doi":"10.1109/INTLEC.2015.7572469","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572469","url":null,"abstract":"In recent years, dc power supply system has been increasingly attracting attention, because a solar power system and a storage battery trade their power by dc. A concept of HVDC Tap (High Voltage DC Tap) is known as an interesting method to build the dc power supply system. However, the circuit causes a high voltage ripple on the dc line and its transformer is afraid to be saturated by a dc bias magnetism. Authors have proposed to reduce the voltage ripple by employing double dc voltage taps in series with the dc line. In this paper, an improved dc voltage tap is proposed to prevent for the transformer from magnetic saturation. As one of its useful applications, this paper introduces a multi-ended dc power supply system with the double dc voltage taps and verifies its operating characteristics in case of balanced or unbalanced load conditions.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125710238","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 : 2015-10-01DOI: 10.1109/INTLEC.2015.7572478
J. K. Jensen, Kasper Jessen, K. Laugesen, Signe M. Mortensen, J. Sørensen, F. Forouzbakhsh
The increasing market of mobile phones, has increased the need for electricity to power mobile phones, as well. This paper investigates the possibilities to charge a mobile phone by harvesting energy from the surroundings. Some technologies are better suited for this purpose than others. Through previous analyses solar cells and electromagnetic generator were found to be the most suitable solution. This paper will give a basic description of the operating conditions of solar cells and an electromagnetic generator. There will also be a short view on the electrical circuit needed for implementing the harvested energy. Calculations regarding the power produced by amorphous silicon solar cells in both sun light and light from different light emitting sources will be examined. Furthermore calculations of the spring for the electromagnetic generator and the power produced by this device will be examined. Through experiments and data processing the energy delivered by the solar cells and the electromagnetic generator is investigated, furthermore an experiment regarding the movement of the phone will be executed.
{"title":"An approach to increase the battery time of a mobile phone using free energy harvesting","authors":"J. K. Jensen, Kasper Jessen, K. Laugesen, Signe M. Mortensen, J. Sørensen, F. Forouzbakhsh","doi":"10.1109/INTLEC.2015.7572478","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572478","url":null,"abstract":"The increasing market of mobile phones, has increased the need for electricity to power mobile phones, as well. This paper investigates the possibilities to charge a mobile phone by harvesting energy from the surroundings. Some technologies are better suited for this purpose than others. Through previous analyses solar cells and electromagnetic generator were found to be the most suitable solution. This paper will give a basic description of the operating conditions of solar cells and an electromagnetic generator. There will also be a short view on the electrical circuit needed for implementing the harvested energy. Calculations regarding the power produced by amorphous silicon solar cells in both sun light and light from different light emitting sources will be examined. Furthermore calculations of the spring for the electromagnetic generator and the power produced by this device will be examined. Through experiments and data processing the energy delivered by the solar cells and the electromagnetic generator is investigated, furthermore an experiment regarding the movement of the phone will be executed.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125869304","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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