High-voltage direct current transmission line fault distance measurement method based on HHT normalized iteration

The invention provides a high-voltage direct current transmission line fault distance measurement method based on HHT (Hilbert-Huang Transform) normalized iteration. Aiming at the problem that it is easy to generate a wave head misjudgment point due to excessively high frequency in a traveling wave ranging method, a method based on HHT normalized iteration is provided, and influences caused by thewave head misjudgment points are eliminated; a three-terminal traveling wave method is used for power transmission line fault location, the problem that it is difficult to calculate the wave speed inthe traditional traveling wave ranging method is solved, and the positioning accuracy is improved; compared with a positioning method of wavelet transformation, the method provided by the invention has the advantages that a normalized time-amplitude diagram formed by HHT normalized iteration is utilized to perform wave head calibration, the stability is high, the error is small, and the method provided by the invention is