In order to improve the performances of failure recovery characteristic of the MIDC

we proposed a novel control method for coordinated VDCOLs after studying the influence of VDCOL on the voltage stability of HVDC system. Firstly

a sensitivity analysis method is used to study the effect of DC on AC/DC power system voltage stability; secondly

a control method for coordinated VDCOLs is designed based on the WAMS. According to the measurement results of phasor measurement unit

the effect of fault on the DC transmission subsystem is assessed

and it can adjust and control the output of the HVDC subsystems’ VDCOL near by the fault point in order to improve the dynamic performance of MIDC system. Finally

a simulation is performed to verify the coordinated control method. From the simulation results

it can be verified that the coordinated control method of the VDCOLs based on the wide-area measurement system can avoid the continuous commutation failure and improve the voltage stability of the system

and thereby improve the recovery performance of the whole system.