Extra-high voltage direct current line boundary element method adopting polar wave wavelet energy ratio
A technology of ultra-high voltage direct current and wavelet energy, which is applied to electrical components, emergency protection circuit devices, etc.
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[0080] Simulation model such as figure 1 As shown, a positive ground fault occurs at a distance of 1km from the protection installation, the fault transition resistance is 0.1Ω, the time window length is 2ms, and the sampling frequency is 100kHz.
[0081] (1) After the DC line fails, the starting element starts immediately, according to the formula:
[0082] p 1 (k)=Z P × i 1 (k)-u 1 (k) (11)
[0083] p 2 (k)=Z P × i 2 (k)-u 2 (k) (12)
[0084] Find the positive polar wave and the negative polar wave, the polar wave waveform is as follows Figure 5 Shown; where, Z p is the polar wave impedance of the DC transmission line, u 1 (k) is the positive DC voltage, i 1 (k) is positive direct current, u 2 (k) is the negative DC voltage, i 2 (k) is the negative direct current, k=1, 2, 3...N, N is the sampling sequence length;
[0085] (2) According to the formula
[0086]
[0087]
[0088] Carry out wavelet transformation on the positive pole wave to obtain high-f...
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