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The adjustable capacity of a line-commutated-converter High Voltage DirectCurrent (LCC-HVDC) connected to a power system, called the LCC-HVDC maximumemergency power capability or HVDC-MC for short, plays an important role indetermining the response of that system to a large disturbance. However, it isa challenging task to obtain an accurate HVDC-MC due to system modeluncertainties as well as to contingencies. To address this problem, this paperproposes to estimate the HVDC-MC using a Thevenin equivalent (TE) of the systemseen at the HVDC terminal bus of connection with the power system, whoseparameters are estimated by processing positive-sequences voltages and currentsof local synchrophasor measurements. The impacts of TE potential changes on theimpedance estimation under large disturbance have been extensively investigatedand an adaptive screening process of current measurements is developed toreduce the error of TE impedance estimation. The uncertainties of phasormeasurements have been further taken into account by resorting to the totalleast square estimation method. The limitations of the HVDC controlcharacteristics, the voltage-dependent current order limit, the convertercapacity, and the AC voltage on HVDC-MC estimation are also considered. Thesimulations show that the proposed method can accurately track the dynamics ofthe TE parameters and the real-time HVDC-MC after the large disturbances.

Real-time LCC-HVDC Maximum Emergency Power Capacity Estimation Based on Local PMU Measurements