Adaptive firing angle compensation control for mitigating DC subsequent commutation failure
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    Abstract:

    Subsequent commutation failure of the high voltage direct current (HVDC) transmission system has a seriously negative impact on the stable operation of the AC-DC hybrid power grid. To reduce the probability of subsequent commutation failure,an adaptive control method for adjusting the power recovery rate of the DC system is proposed in this paper,which combines the power recovery rate of the DC system during the recovery process after the first commutation failure with the severity of AC failure. Firstly,the law of the electric quantity change during the fault recovery process and the factors affecting the subsequent commutation failure are analyzed. Secondly,according to the power recovery rate and the AC voltage drop,the trigger angle of the inverter side during the fault is dynamically adjusted by the proposed control strategy to increase the commutation margin,thereby suppressing the subsequent commutation failure for HVDC. Finally,the control method is simulated and verified based on the CIGRE benchmark model of HVDC. The results show that the proposed control method can adjust the compensation size of compensating trigger angle adaptively according to the voltage drop and DC power recovery characteristics,thereby improving the commutation margin to suppress subsequent commutation failures and speeding up the HVDC system failure recovery.

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History
  • Received:September 04,2021
  • Revised:November 08,2021
  • Adopted:October 13,2021
  • Online: March 24,2022
  • Published: March 28,2022