DC Current Order Optimization Based Strategy for Recovery Performance Improvement of LCC-HVDC Transmission Systems

For the safe and fast recovery of line commutated converter based high-voltage direct current (LCC-HVDC) transmission systems after faults, a DC order optimization strategy is proposed. Considering constraint electric control quantities, with maximum active power transfer calculated by Thevenin equivalent parameters (TEPs) quasi-state equations LCC-HVDC systems. Meanwhile, to mitigate subsequent commutation failures (SCFs) that may come fault process, avoids SCFs through imaginary process. Finally, minimum value two orders sent system. Simulation results on PSCAD/EMT-DC show proposed mitigates effectively exhibits good performance in recovery.