Coordinated Control Method for Commutation Failure Prevention Based on Lightning Warning

Commutation failure refers to the situation in a converter station where the switching of phases cannot be successfully executed due to abnormal current waveform variation or other reasons. In recent years, global lightning activities have become more frequent and intense, which can easily lead to the problem of commutation failure at converter stations, seriously endangering the stability of power grid operation. This paper establishes a coordinated control method for commutation failure prevention based on lightning warning. The moving trajectory of thundercloud obtained through lightning warning technology can infer the location of the transmission line being struck by lightning, and predict the time of lightning strike. On the basis of the traditional coordinated control strategy for preventing commutation failure, set multi gear transformation of gain coefficient and real-time adjustment of control start threshold. The simulation results based on PSCAD indicate that the coordinated control method for commutation failure prevention based on lightning warning can improve the ability of AC transmission lines in the converter station to prevent commutation failure after lightning strikes, enabling the voltage of the AC power system to recover to the normal level.