Coordinated Control Strategy for Commutation Failure Recovery in Multi-infeed AC/DC Systems Based on Multi-infeed Operating Short Circuit Ratio

In multi-infeed AC/DC systems, the simultaneous commutation failure of multiple HVDC systems will seriously threaten the safe operation of the system. A coordinated control strategy for commutation failure recovery is proposed. Firstly, by analyzing the shortcomings of the MIESCR, the multi-infeed operating short circuit ratio (MIOSCR) is proposed. Next, the recovery sequence coordination principles that should be followed for the commutation failure recovery are summarized. Then, based on the MIOSCR, a two-stage coordination control strategy is proposed. Finally, the simulation results of Jiangsu power grid in PSS/E show that the strategy can effectively shorten the duration of commutation failure recovery in multi-infeed AC/DC systems.