Research On The Fault Tripping Criteria Of Stability Control Device Adapting To AC-DC Hybrid Power Grid

摘要

The fault of AC bus in HV (high-voltage) AC-DC hybrid system can cause consequential commutation failure in converter station, and it affect the correct operation of the current stability control device. The mechanism of phase commutation failure is explained in the paper, and the variation of each electrical quantity in AC/DC system during phase commutation failure is analyzed. In addition, it puts forward the new fault tripping criteria in stability control device which adapts to the fault characteristic of AC power grid nearby converter station and based on the comparison between phase voltage and sequence voltage, and sets up the hybrid system containing three DC transmission line under PSCAD/EMTDC to verify the effectiveness of the criteria.