A Review on On-line Voltage Stability Monitoring Indices and Methods Based on Local Phasor Measurements

On-line voltage stability monitoring based on the local phasor measurements is a very active branch of voltage stability assessment presently. It can be divided into local bus measurements based methods and local branch measurements based methods. The latter can be classified into three versions. They are voltage stability indices based on the feasible solution region of quadratic equation of received bus voltage, the branch power transfer limit and the zero perturbation of branch complex power. A comprehensive review and evaluation on them is given in this paper. The numerical results with IEEE39 bus test system show that those voltage stability indices and methods based on branch local measurements cannot be used in on-line voltage stability monitoring of a real large power system.