슈퍼커패시터를 이용한 도시형 철도의 가선전압 안정화 시스템 = Line Voltage Regulation System of Urban Transit System Using Supercapacitors

다국어 초록 (Multilingual Abstract)

In DC electric railway system, when the railcar starts, the electric power is absorbed from the line, and then the line voltage is instantaneously collapsed to provide a large accelerating torque. On the other hand, when the railcar brakes, the regenerative power is created and it increases the line voltage at the pantograph of the railcar. Therefore, by using the energy storage system near the train, the regenerated power can be saved to this system. For the application of this kind of energy storage system, so far battery, flywheel system, and supercapacitors have been considered. Among them, in this paper, supercapacitors are used as the energy storage system. This paper describes the control of energy storage system which consists of a supercapacitor bank and a bidirectional DC-DC converter. Supercapacitor can be used for storing the regenerative energy and for peak power requirement to increase the efficiency and life cycle of the system. This paper presents a method to identify the parameters of supercapacitor equivalent circuit by using the experimental results. In order to verify the validity of this method, parameters of a Maxwell BCAP 3000F are extracted through the experiments and then the equivalent circuit model using these parameters is implemented for PSiM simulation.
And the control strategy of a bidirectional DC-DC converter is described to meet the performance for the initial charging mode and power control mode. Finally the experimental data in laboratory and at Kyoungsan test site for urban light rail road system are provided in detail. From the simulation and experimental results, the validity of this energy storage system using capacitor is verified.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• 1.1 연구의 배경 1
• 1.2 연구의 필요성 2
• 1.3 연구의 방법 4
• 1.4 논문의 구성 6
• Ⅱ. 슈퍼커패시터의 전기적 모델링 8
• 2.1 슈퍼커패시터의 전기적 등가회로 모델 8
• 2.2 각 전송라인의 파라미터 측정 방법 10
• 2.3 슈퍼커패시터의 PSiM 모델 13
• Ⅲ. 슈퍼커패시터 충·방전 장치 19
• 3.1 양방향 DC-DC 컨버터의 토폴로지 19
• 3.2 에너지 저장장치의 구성 22
• 3.3 양방향 DC-DC 컨버터의 제어기 설계 24
• 3.3.1 초기 충전 모드의 제어기 설계 25
• 3.3.2 전력(충·방전) 모드의 제어기 설계 26
• Ⅳ. 시뮬레이션 및 실험 32
• 4.1 시뮬레이션 32
• 4.2 실험 결과 40
• Ⅵ. 결 론 52
• 참고문헌 54
• 부록 . Simulation circuit 57