Pub Date : 2015-10-01DOI: 10.1109/INTLEC.2015.7572280
C. Chun, B. Cho, Joonhoon Kim
This paper proposes state-of-charge (SOC) and remaining charge estimation algorithm of each cell in series-connected lithium-ion batteries. SOC and remaining charge information are indicators for diagnosing cell-to-cell variation; thus, the proposed algorithm can be applied to SOC- or charge-based balancing in cell balancing controller. Compared to voltage-based balancing, SOC and remaining charge information improve the performance of balancing circuit but increase computational complexity which is a stumbling block in implementation. In this work, a simple current sensor-less SOC estimation algorithm with estimated current equalizer is used to achieve aforementioned object. To check the characteristics and validate the feasibility of the proposed method, a constant current discharging/charging profile is applied to a series-connected battery pack (twelve 2.6Ah Li-ion batteries). The experimental results show its applicability to SOC- and remaining charge-based balancing controller with high estimation accuracy.
{"title":"State-of-charge and remaining charge estimation of series-connected lithium-ion batteries for cell balancing scheme","authors":"C. Chun, B. Cho, Joonhoon Kim","doi":"10.1109/INTLEC.2015.7572280","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572280","url":null,"abstract":"This paper proposes state-of-charge (SOC) and remaining charge estimation algorithm of each cell in series-connected lithium-ion batteries. SOC and remaining charge information are indicators for diagnosing cell-to-cell variation; thus, the proposed algorithm can be applied to SOC- or charge-based balancing in cell balancing controller. Compared to voltage-based balancing, SOC and remaining charge information improve the performance of balancing circuit but increase computational complexity which is a stumbling block in implementation. In this work, a simple current sensor-less SOC estimation algorithm with estimated current equalizer is used to achieve aforementioned object. To check the characteristics and validate the feasibility of the proposed method, a constant current discharging/charging profile is applied to a series-connected battery pack (twelve 2.6Ah Li-ion batteries). The experimental results show its applicability to SOC- and remaining charge-based balancing controller with high estimation accuracy.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124333660","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.2015.7572293
Naoki Iwado, Akihiro Ohori, Nobuyuki Hattori, T. Funaki
In power electronics, Power Hardware-in-the-loop Simulation (PHILS) which consists of Hardware part and Digital Simulator part has attracted attention. This is the very useful tool to shorten development time and to simplify verification under complicated condition. However, it is known that instability is caused by the time delay between Digital Simulator and Hardware. This paper applies two methods to manage instability. One is model-base Smith method, and the other is the model-free Fictitious Reference Iterative Tuning (FRIT) method. Experimental results indicate that two methods are effective in compensating the time delay and stabilizing PHILS system.
在电力电子领域，由硬件部分和数字模拟器部分组成的电力硬件在环仿真(power Hardware- In -the-loop Simulation, PHILS)受到了广泛的关注。这是一个非常有用的工具，可以缩短开发时间，简化复杂条件下的验证。然而，已知的不稳定性是由数字模拟器和硬件之间的时间延迟引起的。本文采用两种方法来管理不稳定性。一种是基于模型的Smith方法，另一种是无模型虚拟参考迭代调谐(FRIT)方法。实验结果表明，两种方法都能有效地补偿系统的时滞，使系统稳定。
{"title":"Stabilization techniques of power hardware-in-the-loop simulation with time delay compensation","authors":"Naoki Iwado, Akihiro Ohori, Nobuyuki Hattori, T. Funaki","doi":"10.1109/INTLEC.2015.7572293","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572293","url":null,"abstract":"In power electronics, Power Hardware-in-the-loop Simulation (PHILS) which consists of Hardware part and Digital Simulator part has attracted attention. This is the very useful tool to shorten development time and to simplify verification under complicated condition. However, it is known that instability is caused by the time delay between Digital Simulator and Hardware. This paper applies two methods to manage instability. One is model-base Smith method, and the other is the model-free Fictitious Reference Iterative Tuning (FRIT) method. Experimental results indicate that two methods are effective in compensating the time delay and stabilizing PHILS system.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"11 suppl_1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128357738","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.2015.7572424
D. Talapko, S. Tesnjak
This paper addresses availability of power infrastructure in data centers and associated costs for downtime. Special attention is given to modeling of solar power sources in terms of availability as well as their implementation into critical infrastructure and the justification for their implementation from cost perspective. Influence on overall electrical reliability and availability of infrastructure is shown in different topologies. Architecture of the topologies is based on both alternating current (AC) and direct current (DC) 400V distributions. Results of reliability and availability calculations derive from models based on Dynamic Fault Tree Analysis (DFTA).
{"title":"Influence of availability on the cost analysis of solar powered data centers with AC and DC architecture and mirroring functionality","authors":"D. Talapko, S. Tesnjak","doi":"10.1109/INTLEC.2015.7572424","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572424","url":null,"abstract":"This paper addresses availability of power infrastructure in data centers and associated costs for downtime. Special attention is given to modeling of solar power sources in terms of availability as well as their implementation into critical infrastructure and the justification for their implementation from cost perspective. Influence on overall electrical reliability and availability of infrastructure is shown in different topologies. Architecture of the topologies is based on both alternating current (AC) and direct current (DC) 400V distributions. Results of reliability and availability calculations derive from models based on Dynamic Fault Tree Analysis (DFTA).","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126398775","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.2015.7572416
Baihua Zhang, K. Shi, Qiang Lin, G. M. Dousoky, M. Shoyama, S. Tomioka
The common mode (CM) noise mechanism of totem-pole bridgeless PFC converter is analyzed in this paper. The conducted noise performance of a bridgeless totem-pole PFC converter using GaN HEMTs is investigated under experimental conditions: 230V ac input, 390V dc output, and 50kHz switching frequency. The CM noise located around the input voltage zero-crossing of the converter is noticed to be significant. Therefore, a conducted noise reduction method is proposed in this paper. Experimental results showed that the conducted noise has been suppressed efficiently without deteriorating the converter's efficiency.
{"title":"Conducted noise reduction of totem-pole bridgeless PFC converter using GaN HEMTs","authors":"Baihua Zhang, K. Shi, Qiang Lin, G. M. Dousoky, M. Shoyama, S. Tomioka","doi":"10.1109/INTLEC.2015.7572416","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572416","url":null,"abstract":"The common mode (CM) noise mechanism of totem-pole bridgeless PFC converter is analyzed in this paper. The conducted noise performance of a bridgeless totem-pole PFC converter using GaN HEMTs is investigated under experimental conditions: 230V ac input, 390V dc output, and 50kHz switching frequency. The CM noise located around the input voltage zero-crossing of the converter is noticed to be significant. Therefore, a conducted noise reduction method is proposed in this paper. Experimental results showed that the conducted noise has been suppressed efficiently without deteriorating the converter's efficiency.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126199593","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.2015.7572272
G. Sauba, J. van der Burgt, Emmanouel Varvarigos, Prodromos Makris, A. Schoofs
The subsidy feed in tariff policy, which has been adopted in the past few years, for accelerating renewable energy investments, cannot be retained as a sustainable business model for the future smart energy grid. This is mainly due to the fact that this policy increases the energy cost, especially when the amount of the energy generated by renewable sources is not negligible compared to the traditional ones, as is expected for the near future. Additionally, the current centralized electricity market prevents small or very small energy producers, who usually generate energy by renewable means - photovoltaic units or wind turbines - to participate. There is a role for energy aggregators to act on behalf of these small prosumers so that they could sell their excess energy collectively in order to get a better price. To help the tasks of the aggregator a trading tool is required that will facilitate the clustering of prosumers who are able to offer energy at a certain time during the day based on contractual agreements. The VIMSEN project is set-up to produce such a system that will allow the aggregator to select prosumers and form virtual micro-grids by virtue of smart communication systems. VIMSEN is part of the European R&D 7th Framework Programme with the aims to develop, implement and demonstrate a new energy management and business model system using the concept of virtual microgrids, to enable an increase in the market participation of prosumers at neighbourhood and community levels.
{"title":"VIMSEN — Smart tool for energy aggregators","authors":"G. Sauba, J. van der Burgt, Emmanouel Varvarigos, Prodromos Makris, A. Schoofs","doi":"10.1109/INTLEC.2015.7572272","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572272","url":null,"abstract":"The subsidy feed in tariff policy, which has been adopted in the past few years, for accelerating renewable energy investments, cannot be retained as a sustainable business model for the future smart energy grid. This is mainly due to the fact that this policy increases the energy cost, especially when the amount of the energy generated by renewable sources is not negligible compared to the traditional ones, as is expected for the near future. Additionally, the current centralized electricity market prevents small or very small energy producers, who usually generate energy by renewable means - photovoltaic units or wind turbines - to participate. There is a role for energy aggregators to act on behalf of these small prosumers so that they could sell their excess energy collectively in order to get a better price. To help the tasks of the aggregator a trading tool is required that will facilitate the clustering of prosumers who are able to offer energy at a certain time during the day based on contractual agreements. The VIMSEN project is set-up to produce such a system that will allow the aggregator to select prosumers and form virtual micro-grids by virtue of smart communication systems. VIMSEN is part of the European R&D 7th Framework Programme with the aims to develop, implement and demonstrate a new energy management and business model system using the concept of virtual microgrids, to enable an increase in the market participation of prosumers at neighbourhood and community levels.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122666222","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.2015.7572356
Youhei Takigawa, K. Yukita, Y. Goto, K. Ichiyanagi, Atsushi Miyamoto
When a emergency occurs in the solar power generating, to confirm that there is a possibility of arcing. As long as there is solar radiation, solar power generation keeps supplying the electric power. Therefore if the arc occurs, there is a risk of fire. However, protection device for protecting a direct current system side was not present. We have developed a protective device for performing emergency shutdown to detect the abnormal state of the solar power. In this paper, developed protection instrument was tested actually, and it was confirmed to insulate photovoltaic generation from an arc breakdown.
{"title":"Development of intelligent type power conditioner system with power storage device for photovoltaic generation (Part2)","authors":"Youhei Takigawa, K. Yukita, Y. Goto, K. Ichiyanagi, Atsushi Miyamoto","doi":"10.1109/INTLEC.2015.7572356","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572356","url":null,"abstract":"When a emergency occurs in the solar power generating, to confirm that there is a possibility of arcing. As long as there is solar radiation, solar power generation keeps supplying the electric power. Therefore if the arc occurs, there is a risk of fire. However, protection device for protecting a direct current system side was not present. We have developed a protective device for performing emergency shutdown to detect the abnormal state of the solar power. In this paper, developed protection instrument was tested actually, and it was confirmed to insulate photovoltaic generation from an arc breakdown.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122458897","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.2015.7572331
K. Kajiwara, Tatsuya Ueki, Y. Shibata, F. Kurokawa
The purpose of this paper is to present the digital overcurrent detector for the peak current mode dc-dc converter which has been already applied to the server for the data center. The proposed peak current detection circuit is composed of the RC integrator and comparator as the A-D converter for the detected current. The proposed method can detect the overcurrent by using the RC integration time in real time. Furthermore, it is possible to maintain the arbitrary current in the overcurrent limitation mode. The proposed overcurrent limitation mode is implemented by the FPGA. The effectively of proposed method are confirmed by both of simulated and experimental results.
{"title":"Digital overcurrent detector for peak current mode DC-DC converter","authors":"K. Kajiwara, Tatsuya Ueki, Y. Shibata, F. Kurokawa","doi":"10.1109/INTLEC.2015.7572331","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572331","url":null,"abstract":"The purpose of this paper is to present the digital overcurrent detector for the peak current mode dc-dc converter which has been already applied to the server for the data center. The proposed peak current detection circuit is composed of the RC integrator and comparator as the A-D converter for the detected current. The proposed method can detect the overcurrent by using the RC integration time in real time. Furthermore, it is possible to maintain the arbitrary current in the overcurrent limitation mode. The proposed overcurrent limitation mode is implemented by the FPGA. The effectively of proposed method are confirmed by both of simulated and experimental results.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130137228","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.2015.7572334
S. Endo, Yasuki Kanazawa, Masayoshi Yamamoto
In this paper, an analytical expression for the DC bus harmonics on the input capacitor, caused by a three phase pulse width modulation (PWM) inverter of a high speed motor drive system, is derived. As the result, we found that the parasitic line inductance between the battery and the input capacitor, and the input capacitor are indirectly proportional. We can achieve the calculation method of the voltage ripple of the input capacitor including the parasitic components. Furthermore, the voltage ripple of the battery can be calculated by the switching function using the Bessel function.
{"title":"Analytical calculation of the voltage ripple on the input capacitor of the voltage-PWM inverter for high frequency operation","authors":"S. Endo, Yasuki Kanazawa, Masayoshi Yamamoto","doi":"10.1109/INTLEC.2015.7572334","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572334","url":null,"abstract":"In this paper, an analytical expression for the DC bus harmonics on the input capacitor, caused by a three phase pulse width modulation (PWM) inverter of a high speed motor drive system, is derived. As the result, we found that the parasitic line inductance between the battery and the input capacitor, and the input capacitor are indirectly proportional. We can achieve the calculation method of the voltage ripple of the input capacitor including the parasitic components. Furthermore, the voltage ripple of the battery can be calculated by the switching function using the Bessel function.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124224052","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.2015.7572294
Jinwoo Jeong, Seung-Hee Ryu, Byoung-Kuk Lee, Heejun Kim
A foreign object detection has issued as a problem to be solved urgently on the wireless charging system of electric vehicles. In this paper, the tech tree of the foreign object detection in the view of patent in advanced American and Japanese companies is introduced.
{"title":"Tech tree study on foreign object detection technology in wireless charging system for electric vehicles","authors":"Jinwoo Jeong, Seung-Hee Ryu, Byoung-Kuk Lee, Heejun Kim","doi":"10.1109/INTLEC.2015.7572294","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572294","url":null,"abstract":"A foreign object detection has issued as a problem to be solved urgently on the wireless charging system of electric vehicles. In this paper, the tech tree of the foreign object detection in the view of patent in advanced American and Japanese companies is introduced.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127834028","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.2015.7572314
S. Hamasaki, Takahiro Honda, M. Tsuji
The power conditioning system (PCS) is widely used as a grid connected inverter to keep output constant. A novel power conditioning system (PCS) using a circuit of modular multi-level converter (MMC) construction is investigated. The feature of the system is that output voltage becomes multilevel for low distortion and circuit has an energy storage system such as a battery or an electric double layer capacitor (EDLC). Thus it is convenient for the PV system of which input changes irregularly to apply the circuit with MMC structure. In this paper, the proposed novel PCS is introduced and the control method for the system is proposed. Effectiveness of the proposed PCS is considered by simulation.
{"title":"Novel circuit of power conditioning system with energy storage applying modular multilevel converter structure","authors":"S. Hamasaki, Takahiro Honda, M. Tsuji","doi":"10.1109/INTLEC.2015.7572314","DOIUrl":"https://doi.org/10.1109/INTLEC.2015.7572314","url":null,"abstract":"The power conditioning system (PCS) is widely used as a grid connected inverter to keep output constant. A novel power conditioning system (PCS) using a circuit of modular multi-level converter (MMC) construction is investigated. The feature of the system is that output voltage becomes multilevel for low distortion and circuit has an energy storage system such as a battery or an electric double layer capacitor (EDLC). Thus it is convenient for the PV system of which input changes irregularly to apply the circuit with MMC structure. In this paper, the proposed novel PCS is introduced and the control method for the system is proposed. Effectiveness of the proposed PCS is considered by simulation.","PeriodicalId":211948,"journal":{"name":"2015 IEEE International Telecommunications Energy Conference (INTELEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127970961","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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