Inspec keywords: HVDC power transmission; reactive power control; power factor; power transmission control; voltage-source convertors; power filters; HVDC power convertors; commutation; power system stability; power transmission reliability; power transmission faults; voltage control; failure analysis

Other keywords: de-locking process; low load operation; line-commutated converter; emergency power support; voltage control mode; transient states; hybrid HVDC transmission system; VSC; AC faults; system voltage drop; voltage source converter; AC bus voltage stability; LCC; filter switching; AC bus voltage; VSC reactive power controller; coordinated reactive power control strategy; commutation failure; engineering field test; system power factor

Subjects: d.c. transmission; Reliability; Control of electric power systems; Power and energy control; Power system control; Voltage control