Fuzzy control-based continuous commutation failure prevention control method for high-voltage direct-current transmission system
A technology of fuzzy control and commutation failure, applied in the direction of power transmission AC network, fault location, etc., can solve the problems of poor suppression of continuous commutation failure, lack of indicators for virtual commutation area, start-up voltage fluctuations, etc., to improve the ability to resist , It is conducive to the rapid recovery of stable operation and fast response
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[0028] The method of the present invention analyzes the transient characteristics of the leading trigger angle when an asymmetric fault occurs in the AC system on the inverter side. According to the leading trigger angle structure, a feedforward compensation link is designed based on the fuzzy control theory, which can effectively improve the leading trigger angle The tracking accuracy of the control command is used to reduce the probability of continuous commutation failure in the DC system.
[0029] In the HVDC transmission system based on the thyristor converter, when the AC system on the inverter side fails, the commutation voltage amplitude decreases and the waveform is distorted, the commutation failure is extremely easy. In the process of the DC system recovering from the failure of the first commutation, the leading trigger angle has a wide range of adjustments. If the leading trigger angle corresponding to the actual trigger moment has a large deviation from the command v...
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