著者

塩井 太介 宮下 充 渡辺 大貴 日下 佳祐 伊東 淳一 中西 俊貴 小林 和博

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.141, no.7, pp.520-531, 2021-07-01 (Released:2021-07-01)

参考文献数

30

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This paper proposes a multiport converter based on a flying capacitor converter topology for use in a battery management system. The proposed circuit operates in discontinuous current mode and pulse frequency modulation in order to reduce inductor volume. The circuit achieves load fluctuation compensation and maximum power point tracking of the photovoltaic (PV) system by deciding duty ratio based on load current and PV output current. According to the experimental results, an efficiency of more than 95.8% was achieved under all operation conditions. In addition, the maximum efficiency reached 98.8% at the rated load (750W). Furthermore, the inductor volume reduced by 85.5% compared to that of the conventional circuit using two inductors.

著者

南 政孝 塩井 太介 茂木 進一 道平 雅一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.139, no.4, pp.280-286, 2019-04-01 (Released:2019-04-01)

参考文献数

43

被引用文献数

2

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The grid connection inverter is built in the PCS (Power Conditioning Subsystem) for the distributed power supply, such as photo voltaic system. In order to utilize the power source, it is necessary that the grid connection inverter of the PCS predicts the load and output fluctuation in customer side. Therefore, this paper investigates a load estimation in the grid connection inverter of the PCS. The proposed estimation method adds superimposing perturbative signals in the inverter reference. The validity of the proposed estimation method is experimentally verified. In addition, the perturbative signals for load estimation consist of three different frequency components. As the result, it is experimentally clarified the proposed method improves the estimation accuracy.

著者

塩井 太介 熊谷 崇宏 日下 佳祐 伊東 淳一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.142, no.3, pp.198-205, 2022-03-01 (Released:2022-03-01)

参考文献数

31

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This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of a compressor. Vibrations are generated by the bouncing of the rotor caused by load torque fluctuations. The proposed method suppresses the bouncing by stopping the motor during the suction process, thereby preventing the generation of a large torque. In order to stop the motor during the suction process, the proposed method switches from the free-run to short-circuit braking mode at the top dead center, which is the starting point of the suction process. Furthermore, the inrush current during the short-circuit braking mode is suppressed using a hysteresis current controller. The vibrations are evaluated under four pressure conditions using the conventional and proposed methods. The results show that, the proposed method achieves more than 50% reduction in the amplitudes of the vibrations at all four pressure conditions. Notably, the proposed method reduces the amplitude of the vibration by 71% under the high-pressure condition.