{"title":"IEEJ Journal of Industry Applications","authors":"","doi":"10.1541/ieejjia.13.l1_1","DOIUrl":"https://doi.org/10.1541/ieejjia.13.l1_1","url":null,"abstract":"","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"38 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139129800","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}
This study aims to verify the application of amorphous metals to high-speed drive motors. We propose a new high-speed motor that applies amorphous metal to ultra-high-speed motors used in home appliances. The proposed motor can reduce both the iron loss and copper loss compared to conventional vacuum cleaner motors. We performed characteristic analysis and prototype evaluation through magnetic field analysis of the proposed motor. The analysis results at the same operating point, confirm that the efficiency improvement effect was approximately 1% compared to the highest grade electrorical steel sheet machine. The prototype evaluation results of the new high-speed motor, confirm that various characteristics obtained by the analysis could be reproduced. As a result of evaluating prototypes composed of different materials, the effect of improving motor efficiency by applying amorphous metal is confirmed quantitatively.
{"title":"Study on Application of Amorphous Metal to New Single-Phase Synchronous Motors Driven at High Frequencies","authors":"Yuji Enomoto, Ryouichi Takahata, Daisuke Sato, Yasuhiro Marukawa, Hirohisa Sano","doi":"10.1541/ieejjia.22010182","DOIUrl":"https://doi.org/10.1541/ieejjia.22010182","url":null,"abstract":"This study aims to verify the application of amorphous metals to high-speed drive motors. We propose a new high-speed motor that applies amorphous metal to ultra-high-speed motors used in home appliances. The proposed motor can reduce both the iron loss and copper loss compared to conventional vacuum cleaner motors. We performed characteristic analysis and prototype evaluation through magnetic field analysis of the proposed motor. The analysis results at the same operating point, confirm that the efficiency improvement effect was approximately 1% compared to the highest grade electrorical steel sheet machine. The prototype evaluation results of the new high-speed motor, confirm that various characteristics obtained by the analysis could be reproduced. As a result of evaluating prototypes composed of different materials, the effect of improving motor efficiency by applying amorphous metal is confirmed quantitatively.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"69 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136172290","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 : 2023-11-01DOI: 10.1541/ieejjia.22009178
Shota Miyoshi, Wataru Ohnishi, Takafumi Koseki, Motoki Sato
Boost converters are key components of DC power conversion used for electric mobility and renewable energy applications. In addition to constant voltage control of the output, variable voltage control has been attracting attention in recent years for high-efficiency drive of loads. However, the dynamic characteristics of boost converters exhibit non- linear and nonminimum phase characteristics. Therefore, the inverse model for feedforward control is unstable, making high-precision voltage trajectory tracking control challenging. This study aims to present a noncausal and nonlinear feedforward controller to compensate for the nonlinear and nonminimum phase characteristics of the boost converter and to achieve perfect tracking control with respect to the output voltage trajectory. This study also establishes a method for identifying circuit parameters and deriving the time length of noncausal control input for practical implementation. The effectiveness of this control method is demonstrated by experiments using a boost converter.
{"title":"Output Voltage Precise Tracking Control for Boost Converters Based on Noncausal and Nonlinear Feedforward Control","authors":"Shota Miyoshi, Wataru Ohnishi, Takafumi Koseki, Motoki Sato","doi":"10.1541/ieejjia.22009178","DOIUrl":"https://doi.org/10.1541/ieejjia.22009178","url":null,"abstract":"Boost converters are key components of DC power conversion used for electric mobility and renewable energy applications. In addition to constant voltage control of the output, variable voltage control has been attracting attention in recent years for high-efficiency drive of loads. However, the dynamic characteristics of boost converters exhibit non- linear and nonminimum phase characteristics. Therefore, the inverse model for feedforward control is unstable, making high-precision voltage trajectory tracking control challenging. This study aims to present a noncausal and nonlinear feedforward controller to compensate for the nonlinear and nonminimum phase characteristics of the boost converter and to achieve perfect tracking control with respect to the output voltage trajectory. This study also establishes a method for identifying circuit parameters and deriving the time length of noncausal control input for practical implementation. The effectiveness of this control method is demonstrated by experiments using a boost converter.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"113 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134902540","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}
{"title":"IEEJ Journal of Industry Applications","authors":"","doi":"10.1541/ieejjia.12.l6_1","DOIUrl":"https://doi.org/10.1541/ieejjia.12.l6_1","url":null,"abstract":"","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"125 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135161851","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}
{"title":"IEEJ Journal of Industry Applications","authors":"","doi":"10.1541/ieejjia.12.l5_1","DOIUrl":"https://doi.org/10.1541/ieejjia.12.l5_1","url":null,"abstract":"","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310140","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}
This paper discusses operation characteristics of discontinuous current mode (DCM) for an ac-dc isolated converter for on-board battery chargers of electric vehicles. The converter discussed in this paper consists of a front-end diode- bridge rectifier, an active energy buffer, and a dual-active-bridge dc-dc converter. The energy buffer circuit absorbs the power pulsation from the single-phase ac line into a small-rated capacitor, and thus, makes it possible to reduce a required capacitance of the dc-link capacitor. This paper explains details of the DCM control method including a technique of the ripple cancel of the inductor current, to realize the power factor correction of the line current and the voltage control of the buffer capacitor at the same time without complex calculations. Then, a reference value of the inductor current and an operation range of the dc-output voltage are discussed. Experimental results obtained by a 220-V, 6.6-kW experimental setup demonstrate a sinusoidal-line current and a controlled buffer capacitor voltage as well as a smoothed dc-output current.
{"title":"Operation Characteristics of Discontinuous Current Mode for a Dual-Active-Bridge AC-DC Converter with an Active Energy Buffer","authors":"Shohei Komeda, Shunsuke Takuma, Yoshiya Ohnuma, Ryo Gondo, Daisuke Maezaki, Noritaka Taguchi","doi":"10.1541/ieejjia.22004964","DOIUrl":"https://doi.org/10.1541/ieejjia.22004964","url":null,"abstract":"This paper discusses operation characteristics of discontinuous current mode (DCM) for an ac-dc isolated converter for on-board battery chargers of electric vehicles. The converter discussed in this paper consists of a front-end diode- bridge rectifier, an active energy buffer, and a dual-active-bridge dc-dc converter. The energy buffer circuit absorbs the power pulsation from the single-phase ac line into a small-rated capacitor, and thus, makes it possible to reduce a required capacitance of the dc-link capacitor. This paper explains details of the DCM control method including a technique of the ripple cancel of the inductor current, to realize the power factor correction of the line current and the voltage control of the buffer capacitor at the same time without complex calculations. Then, a reference value of the inductor current and an operation range of the dc-output voltage are discussed. Experimental results obtained by a 220-V, 6.6-kW experimental setup demonstrate a sinusoidal-line current and a controlled buffer capacitor voltage as well as a smoothed dc-output current.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136138974","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}
In this study, an automotive photovoltaic (PV) system was fabricated for electric vehicles. The PV panel for the PV system prototype comprises modules. Each module is equipped with a converter for maintaining maximum power point tracking (MPPT) operation. This configuration allows performing the MPPT operation individually for each PV module. Furthermore, the MPPT operation performance during driving was verified. The PV system prototype maintained power generation during driving using the MPPT operation. In situations where the solar radiation varies frequently, the range of the MPPT voltage search influences the tracking achievement ratio (TAR). In addition, a TAR of 97% was achieved by optimizing the range of the MPPT voltage search.
{"title":"MPPT Operation Performance of Automotive Photovoltaic System during Driving","authors":"Yosuke Tomita, Masanori Saito, Yoshiyuki Nagai, Tsutomu Tanimoto, Takumi Arai, Kimihiro Nishijima","doi":"10.1541/ieejjia.22007903","DOIUrl":"https://doi.org/10.1541/ieejjia.22007903","url":null,"abstract":"In this study, an automotive photovoltaic (PV) system was fabricated for electric vehicles. The PV panel for the PV system prototype comprises modules. Each module is equipped with a converter for maintaining maximum power point tracking (MPPT) operation. This configuration allows performing the MPPT operation individually for each PV module. Furthermore, the MPPT operation performance during driving was verified. The PV system prototype maintained power generation during driving using the MPPT operation. In situations where the solar radiation varies frequently, the range of the MPPT voltage search influences the tracking achievement ratio (TAR). In addition, a TAR of 97% was achieved by optimizing the range of the MPPT voltage search.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135011311","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 : 2023-07-01DOI: 10.1541/ieejjia.22008067
Razvan Andrei Budau Petrea, Roberto Oboe, Giulia Michieletto
Physical human-robot interaction applications requiring safety and compliance characteristics usually employ mechanical devices such as series elastic actuators (SEAs). So far, impedance control schemes for SEAs have been investigated to overcome the limited displayable stiffness at the end point, represented by the stiffness of a physical spring, in a passive manner. SEAs usually mount two encoders on both the motor and load sides for position measurements. However, in several applications, the installation of a load-side encoder is not feasible from both cost and manufacturing perspectives. In this scenario, a Kalman Filter based on micro electro mechanical system accelerometers has been proposed for estimating the external force and load side quantities, without the need for load-side encoders. Herein, a novel impedance control scheme leveraging this approach is proposed to effectively overcome the stiffness of the physical spring while maintaining passivity at the end point. Compared with conventional load-side encoder-based impedance control schemes, the proposed control scheme presents comparable performance, as demonstrated by simulation and experimental results.
{"title":"Safe High Stiffness Impedance Control for Series Elastic Actuators using Collocated Position Feedback","authors":"Razvan Andrei Budau Petrea, Roberto Oboe, Giulia Michieletto","doi":"10.1541/ieejjia.22008067","DOIUrl":"https://doi.org/10.1541/ieejjia.22008067","url":null,"abstract":"Physical human-robot interaction applications requiring safety and compliance characteristics usually employ mechanical devices such as series elastic actuators (SEAs). So far, impedance control schemes for SEAs have been investigated to overcome the limited displayable stiffness at the end point, represented by the stiffness of a physical spring, in a passive manner. SEAs usually mount two encoders on both the motor and load sides for position measurements. However, in several applications, the installation of a load-side encoder is not feasible from both cost and manufacturing perspectives. In this scenario, a Kalman Filter based on micro electro mechanical system accelerometers has been proposed for estimating the external force and load side quantities, without the need for load-side encoders. Herein, a novel impedance control scheme leveraging this approach is proposed to effectively overcome the stiffness of the physical spring while maintaining passivity at the end point. Compared with conventional load-side encoder-based impedance control schemes, the proposed control scheme presents comparable performance, as demonstrated by simulation and experimental results.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135061277","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}
The dynamic and steady-state behaviors of distributed power supply in a DC architecture with a minimized DC bus capacitor is investigated in this paper using the power balance control technique. The circuit is simulated and analyzed using MATLAB Simulink. The proposed system significantly improves the dynamic response of the converter to load steps with the minimized DC bus capacitor for a distributed Power System. The possibility of using a ratio of capacitance/watt lower than the typical values used in commercial applications, while maintaining the output voltage regulation, is theoretically proved. The minimized DC bus capacitors of the proposed system are 100µF (0.1µF/W), 400µF (0.47µF/W), 80µF (0.53µF/W), 100µF (0.67µF/W), 2000µF (5µF/W) and 2000µF (5µF/W) for the 380Vdc, 100Vdc, 60Vdc, 48Vdc, 24Vdc, and 12Vdc, respectively. The simulation results show the following advantages: small capacitor size, reduced converter volume, good steady-state behavior, and fast dynamic transient response.
{"title":"Dynamic and Steady-State Behavior of Distributed Power Supply in DC Architecture with Minimized DC Bus Capacitor","authors":"Uthen Kamnarn, Anon Namin, Pakawadee Wutthiwai, Jedsada Yodwong, Phatiphat Thounthong, Noureddine Takorabet","doi":"10.1541/ieejjia.22008110","DOIUrl":"https://doi.org/10.1541/ieejjia.22008110","url":null,"abstract":"The dynamic and steady-state behaviors of distributed power supply in a DC architecture with a minimized DC bus capacitor is investigated in this paper using the power balance control technique. The circuit is simulated and analyzed using MATLAB Simulink. The proposed system significantly improves the dynamic response of the converter to load steps with the minimized DC bus capacitor for a distributed Power System. The possibility of using a ratio of capacitance/watt lower than the typical values used in commercial applications, while maintaining the output voltage regulation, is theoretically proved. The minimized DC bus capacitors of the proposed system are 100µF (0.1µF/W), 400µF (0.47µF/W), 80µF (0.53µF/W), 100µF (0.67µF/W), 2000µF (5µF/W) and 2000µF (5µF/W) for the 380Vdc, 100Vdc, 60Vdc, 48Vdc, 24Vdc, and 12Vdc, respectively. The simulation results show the following advantages: small capacitor size, reduced converter volume, good steady-state behavior, and fast dynamic transient response.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135061275","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 : 2023-07-01DOI: 10.1541/ieejjia.22007605
Tomohiro Yamaguchi, Takayuki Matsumoto
This paper proposes an autonomous control scheme for power-sharing between energy storage systems (ESSs). The targeted ESS consists of multiple distributed ESSs, all connected to the same DC grid. Importantly, the proposed control method does not require communication between the distributed ESSs and solves the existing power-sharing problems during a communication failure. The autonomous control scheme is based on conventional voltage droop control but features manipulating the reference voltage with a fixed virtual resistance. Each ESS manipulates the reference voltage command value and cooperatively shares the power between any number of ESSs. Operational problems occur when combining autonomous control with an existing state-of-charge (SOC) based mode-switching control, which toggles charge and discharge modes according to the SOC threshold of the battery. There is a possibility that all ESSs are in the same mode, then they cannot share the power and face the risk of system failure. Furthermore, the SOC of each ESS is unbalanced with no power-sharing as it only depends on its power generation and consumption. The resulting difference in charge and discharge cycle causes the difference in the life cycle of the batteries between the ESSs. To solve this problems, this paper additionally proposes a control method for a power-sharing operation that averages the SOC of each ESS without mode switching. Accordingly, the basic control law and control method of autonomous control are derived, and the amount of power-sharing is quantitatively considered, and the proposed control method is experimentally validated.
{"title":"Autonomous Control for Cooperative Operation Between Energy Storage Systems","authors":"Tomohiro Yamaguchi, Takayuki Matsumoto","doi":"10.1541/ieejjia.22007605","DOIUrl":"https://doi.org/10.1541/ieejjia.22007605","url":null,"abstract":"This paper proposes an autonomous control scheme for power-sharing between energy storage systems (ESSs). The targeted ESS consists of multiple distributed ESSs, all connected to the same DC grid. Importantly, the proposed control method does not require communication between the distributed ESSs and solves the existing power-sharing problems during a communication failure. The autonomous control scheme is based on conventional voltage droop control but features manipulating the reference voltage with a fixed virtual resistance. Each ESS manipulates the reference voltage command value and cooperatively shares the power between any number of ESSs. Operational problems occur when combining autonomous control with an existing state-of-charge (SOC) based mode-switching control, which toggles charge and discharge modes according to the SOC threshold of the battery. There is a possibility that all ESSs are in the same mode, then they cannot share the power and face the risk of system failure. Furthermore, the SOC of each ESS is unbalanced with no power-sharing as it only depends on its power generation and consumption. The resulting difference in charge and discharge cycle causes the difference in the life cycle of the batteries between the ESSs. To solve this problems, this paper additionally proposes a control method for a power-sharing operation that averages the SOC of each ESS without mode switching. Accordingly, the basic control law and control method of autonomous control are derived, and the amount of power-sharing is quantitatively considered, and the proposed control method is experimentally validated.","PeriodicalId":45552,"journal":{"name":"IEEJ Journal of Industry Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135061276","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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