Abstract
High voltage DC (HVDC) system is important transmission technology, with several advantages over the AC transmission system. Transient analysis plays an important role in the power systems, in particular for the multi-terminal DC (MTDC) system. In DC systems, the DC line fault can result in extremely fast rising current compared to its AC counterpart due to absence of the line inductance. Therefore, the analysis of fast transients is of great interest in the HVDC system, in particular for MTDC system. In this paper, the application of Short Time Fourier Transform (STFT) in transient analysis of current signals in the MTDC system has been investigated. Because of uncertainty principle with the STFT, finer time resolution has been chosen at the expense of frequency resolution, allowing for faster detection. The CIGRE B4 multi-terminal DC grid system has been modeled in PSCAD/EMTDC, and transient events are simulated. The steady-state and the transient currents in the different terminals are monitored and analyzed using the STFT.
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