Commutation failure prediction method based on direct current finite time domain prediction
A technology of direct current and commutation failure, applied in the direction of power transmission AC network, etc., can solve the problems of large difference in arc extinguishing angle and poor predictive control effect, and achieve the effect of high prediction accuracy, good prediction effect and easy realization
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[0031] A commutation failure prediction method based on DC current finite time domain prediction, comprising the following steps:
[0032] Step 1: Detection of voltage difference: After the system runs stably, detect the DC voltage difference ΔU and its derivative dΔU / dt on both sides of the DC line rectification and inverter in real time, and turn to step 2 when the change is greater than the preset threshold, otherwise turn to step 1;
[0033] Step 2: Calculate the critical value of DC current variation:
[0034]
[0035] In the formula: N is the number of 6-pulse converters in the actual project; k is the conversion ratio of the converter transformer; γ min Take 7.2° for the limit turn-off angle; X c is the commutation reactance of the inverter, α is the firing angle of the inverter; I d (α) is the instantaneous value of the DC current, ΔU is the rectification of the DC line and the voltage difference on both sides of the inverter, and E is the effective value of the A...
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