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수소 연료 전지 기반 철도 차량용 3-Level Boost 컨버터의 EMI 필터 회로 연구
이동인,현예지,정성욱,김민재,윤한신 한국철도학회 2023 한국철도학회논문집 Vol.26 No.7
Recently, the development of power and driving system technology for railway vehicles has steadily adopted hydrogen fuel cells with the goal of reducing carbon emissions and developing eco-friendly technologies. DC/DC converters are used to boost the low level voltage of fuel cells to the high level above 1,000 V required by an inverter and battery system; a 3-Level Boost converter is a suitable alternative. However, since the 3-Level Boost converter generates common mode EMI noise due to the switching operation, countermeasures are needed. Generally, Y capacitors or conventional EMI filter circuits are applied as a countermeasure to the common mode EMI noise problem, but this is not a suitable for 3-Level Boost converters, so a different EMI filter circuit is needed. In this paper, the necessity of an EMI filter and a new EMI filter structure based on a 3-Level Boost converter is presented and system validity is verified by simulation results.
다수의 Photovoltaic Submodule용 컨버터를 통합한 DPP 컨버터
임지훈,이동인,현예지,최재혁,윤한신 전력전자학회 2022 전력전자학회 논문지 Vol.27 No.1
Recently, photovoltaic (PV) systems have been gradually applied in eco-friendly vehicle applications to improve fuel economy. The relevant market is expected to continue to grow because the installation of large-capacity PV systems to other eco-friendly vehicles, such as electric buses and trains, is being considered. However, in a PV system, power imbalance between submodules and low power generation efficiency occur due to factors such as cell aging, contamination, and shading. To resolve this problem, various differential power processing (DPP) converters have been researched and developed. However, conventional DPP converters suffer from large volume and low efficiency. Therefore, to apply DPP converters to eco-friendly vehicles, increasing efficiency and reducing volume and price compared with existing DPP converters is necessary. In this paper, a novel DPP converter with an integrated transformer is proposed and analyzed. The proposed DPP converter uses a single magnetic component by integrating transformers and secondary sides of conventional DPP converters. Therefore, the proposed DPP converter shows high power density and high efficiency, and it is suitable for PV systems in eco-friendly vehicle applications.
수소연료전지 하이브리드 철도차량용 병렬입력-직렬출력 구조 다중 공진형 LLC 컨버터의 모듈 출력 불평형 및전압전류 리플 저감을 위한 제어 기법 연구
임지훈,이동인,김상민,홍상혁,김하윤,윤한신 한국철도학회 2020 한국철도학회논문집 Vol.23 No.10
In order to apply the output of a hydrogen fuel cell as an input to a propulsion system, a step-up converter is required to supply a stable high voltage. In addition, since an LLC resonant converter is a promising candidate because of its small volume and loss, a lot of LLC resonant converters have been studied and researched. In particular, among such studies, a multiple LLC resonant converter with parallel input-serial output structure has been found to provide optimized efficiency despite a wide input/output range due to the low Q factor resulting from the parallel input-series output structure. In addition, the reduced voltage stresses on the secondary diodes can be achieved because of the series output structure. As a result, multiple LLC resonant converters have been gaining more and more attention. However, a maximum 15% output voltage deviation and output power imbalance of the individual LLC converter module occurs due to tolerance of the resonant tank. In this paper, a control method that reduces the output voltage and output power imbalance of individual LLC converter modules through frequency/duty-ratio control, and that reduces the input current and output voltage ripples through interleaving control of the modules, is proposed. Based on the proposed control method, it is possible to optimize the design of the converter module without considering the design margin, and it is easy to manage the life of the individual modules. Moreover, it can supply stable power to the propulsion system by minimizing output voltage ripples of the series output.