전철의 최대급전 완화를 위한 최적화 모형: 서울 메트로 4 호선 사례연구

This paper considers the problem of using regenerated brake power to reduce the maximum traction power of mass rapid transit (MRT) railways. The motion of a train running between stations is divided into three phases: the traction, coasting, and deceleration phases. The traction phase requires high power as traction energy to operate MRT railways. The coasting phase is stable motion and requires little or no power. The deceleration phase is the braking mode and produces regenerated brake power as regenerative energy. If too many trains are accelerating simultaneously in adjacent stations within a specific range of the power supply system, high traction power is incurred and cumulative electric charges are imposed. To solve the problem, we developed an optimization model with the objective of reducing the maximum traction energy of MRT railways. A case study was conducted using real data of the Seoul Metro line 4.