Abstract
With the rapid discharge of the dc-link capacitors during the fault occurrence, the dc line current grows rapidly in the dc grid, which interfaces the ac sources through the voltage source converter. Therefore, it is essential to develop a dc fault detection method, which can detect the dc fault with fast response speed and high reliability. In this study, a novel fault detection method is proposed based on high-pass filtering. By selecting the peak value of the filtered signal as the detection parameter, the fault features could be emphasized and the steady-state characteristics is suppressed. Its validity is tested with a seven bus multi-terminal dc (MTDC) system in the OPAL-RT simulator and a four bus MTDC experimental dc system. In the test, a response delay within 1 ms and 100 % reliability under different conditions are achieved. The proposed method is compared with four existing methods based on the wavelet transform, the short time Fourier transform, the S transform or the Hilbert-Huang transform to underline its integral performance.
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