High-voltage DC transmission line lightning interference recognition method based on S transform
A technology of transmission line and identification method, which is applied in the direction of fault location and fault detection according to conductor type, etc., can solve the problems of high resistance fault affecting threshold value setting, lack of anti-interference sensitivity, etc., and achieves high practical value, fast action speed, Reliable effect
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[0030] The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings:
[0031] The invention discloses a lightning strike identification method for high-voltage direct current transmission lines based on S transformation, which comprises the following steps:
[0032] Step 1. Collect the voltage at the protection element connected to each pole of the DC transmission line in real time at the protection installation on the rectifier side of the system;
[0033] Step 2. After filtering the voltage at the protection element collected in step 1, extract the voltage fault component 5ms after the fault, and calculate the line mode voltage;
[0034] Step 3. Perform S transform on the line mode voltage component at the system protection installation location to obtain its complex time-frequency S matrix, obtain the S transform transient energy GL in the frequency band below 100 Hz and the S transform transient energy GH in the freq...
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