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최용은,오효석,장진영,김재문 대한전기학회 2023 전기학회논문지 Vol.72 No.12
CMV, which affects the safety of ESS, not only causes battery fires, but also causes distortion in 3-phase power according to grid connection. Therefore, it is very important to understand the CMV that occurs in the design and operating conditions of the ESS. In this paper, the effect of CMV according to load changes was analyzed. First, it was confirmed that the PCS switching frequency of 5 [kHz] appears as CMV due to the common grounding of the ESS system. And when a load is connected between the AC system and the PCS while the PCS is operating, leakage current flows through the common ground. As a result, it was found that CMV of the same size appears on the (+) and (-) sides of the PCS DC, and that the AC system voltage is also relatively distorted due to the influence of CMV depending on the load.
무인운전 도시철도차량 및 PSD 인터페이스 기능안전성에 관한 연구
최용은,정기호,오효석,문병민,김재문 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.12
Under the revision of the National Railroad Safety Act, some existing platform safety systems are being changed to platform safety doors (PSDs) and have mandatory installation for new routes. To secure the safety of PSD functions recently introduced in unmanned driving systems, the safety of a vehicle RF device installed in vehicles that are directly linked to a PSD is required. Therefore, this study analyzed safety requirements to secure functional safety of the interface between the PSD and the vehicle door according to the introduction of a new PSD for onboard RF control devices. Functional safety application and functional improvement were implemented for opening and closing signal commands for an urban railway vehicle door. We verified the functional improvement through field-tested functional safety of an urban railway driverless system between a vehicle and a PSD.