인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Neutral sections in 25 kV AC railways require trains to coast with the main circuit breaker open, which temporarily interrupts traction. Regenerative-energy use also varies with the power-receptive capacity of the feeding section and the upstream grid. The operational and energy effects of a bidirectional continuous feeding system based on a modular multilevel converter (MMC) were quantified using a one-dimensional train-motion model and an energy-balance calculation. A 300 km/h train was evaluated for effective de-energized lengths of 200–800 m and gradients of 0–15‰. At 400 m, speed loss increased from 1.28 km/h on level track to 3.23 km/h at 12‰ and reached 7.50 km/h at 800 m and 15‰. The calculated delay to initial-speed recovery remained below 0.4 s. When regenerative receptivity increased from 0.32 to 0.88, the reduction in normalized net supply energy ranged from 5.8% to 18.6% as the recoverable braking-energy ratio varied from 0.10 to 0.30. The reduction was 12.0% at a ratio of 0.20. Field validation requires synchronized measurements of train operation and feeder power to replace the assumed vehicle parameters and receptivities.
본문·목차
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.