電気学会論文誌D(産業応用部門誌)
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
最新号
選択された号の論文の26件中1~26を表示しています
特集:2023年産業応用部門大会
特集論文
  • 清水 俊匡, 久野村 健, 宮嶋 宏樹, 永井 匠
    2024 年 144 巻 6 号 p. 434-441
    発行日: 2024/06/01
    公開日: 2024/06/01
    ジャーナル 認証あり

    In this paper, we describe the control of electronic frequency converters (EFCs), which enables them to continue independent operation in the event of a fault, which is necessary to replace all the frequency conversion facilities in the Tokaido Shinkansen to EFCs. To continue independent operation of the EFCs under faults, we have developed a new overcurrent suppression control scheme applied to the three-phase AC input and output EFCs. We confirm through simulations that the new control suppresses fault current effectively and enables the EFCs to continue operation through a series of operations in which short-circuit faults occur at the feeding circuit, and the circuit breaker interrupts the circuit at the location of the fault following its occurrence and re-closes it after a short interval.

  • 長井 健介, 大西 亘, 古関 隆章
    2024 年 144 巻 6 号 p. 442-451
    発行日: 2024/06/01
    公開日: 2024/06/01
    ジャーナル 認証あり

    Train localization is an essential technology for effective train control. Currently, train localization primarily relies on using track circuits and balises, which are placed along the track to provide precise location information. However, balises have to be placed at intervals of a few kilometers. This increases maintenance costs and makes them vulnerable to being damaged by ice blocks falling from moving trains. Therefore, in this study, we propose a method for absolute train localization based on structure detection and identification using a 1D-LiDAR sensor to reduce the number of balises. Structure identification is achieved using scan matching. In the experiments using a car, the proposed method achieved an identification success rate of over 90%. We also considered the effect of raindrops by filtering the measurement data. By testing and analyzing the identification results, we successfully reduced all cases of misidentification.

  • 寺西 啓悟, 石原 和, 井上 馨, 加藤 利次
    2024 年 144 巻 6 号 p. 452-459
    発行日: 2024/06/01
    公開日: 2024/06/01
    ジャーナル 認証あり

    During variable speed operation, the energy loss of an induction motor varies depending on the time waveforms (trajectories) of rotational angular velocity, torque, and rotor flux. Therefore, the optimal trajectories should be derived to minimize the energy loss under the given drive conditions. Several motor parameters, such as rotational damping coefficient and core loss resistance, vary based on the operating points. A design method of optimal trajectories with these variations should be discussed for energy saving. In this paper, the optimal trajectories (rotational angular velocity, torque, rotor flux) considering the rotational damping characteristics and the core loss resistance that vary based on the operating point are derived by applying an analytical method. The trajectories near each operating point are derived, and the overall trajectory is derived by connecting them. The rotational damping characteristic at the operating point is obtained from the experimentally measured data. A core loss resistance map is derived by subtracting the known loss component from the experimentally obtained loss map, and the core loss map data at each operating point are obtained and used to design the trajectories.

  • 坂井 桂祐, 大西 亘, 古関 隆章, 田中 和広, 森田 隼史, 徳原 克俊, 葛西 光希
    2024 年 144 巻 6 号 p. 460-466
    発行日: 2024/06/01
    公開日: 2024/06/01
    ジャーナル 認証あり

    Mitigating delay propagation owing to excess dwell time at stations is crucial for ensuring stable transport regarding high-frequency urban train services. Previously, we assumed that only one train could enter the entire station section because trains may move back at a station section, which worsens the delay propagation. In this paper, we propose a partial moving block signaling operation, in which trains are operated by moving block signaling at a station after the platform doors open. We numerically verify the effectiveness of reducing the delay time based on case studies including the whole line. The results reveal that the partial moving block signaling operation can further mitigate delay propagation. However, turn-back stations present bottle-neck owing to their fixed block signaling restriction.

論文
研究開発レター
ニュースレター
feedback
Top