Abstract
In this paper, techniques for estimating the capacitance was proposed for diagnosing the capacitor state of the DC-Link stage of the SIV installed under the metro line 4 urban railroad vehicle in the metropolitan area. There are various estimation techniques, but considering the situation in which the current flowing through the capacitor and the inverter input current cannot be measured realistically due to the structure of the SIV, two methods based on the BPF and the inverter output line to line voltage were proposed. The estimation methods were verified through simulation, and as a result, it was confirmed that the methods were estimated within an error range of 1.7~3.7% based on the BPF technique and 1.2~1.7% based on the 3-phase inverter output line to line voltage.
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