Abstract
The main and backup protection principles in the flexible high-voltage direct-current (HVDC) transmission lines are traveling wave (TW) and differential voltage, respectively. However, these protections may suffer from misoperation problems due to the uncertain interference from the differential quantities of fault signals. This study analyses the characteristics of high-frequency components of TW under different sampling rates and noise ratios. An improved TW protection method based on the tracking differentiator is then proposed to enhance the anti-interference ability of TW protection. The proposed method is validated using a four-terminal HVDC grid. Simulation results show that the method can enhance the reliable trip of protection against HVDC line faults under high sampling frequency.
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