Phasor measurement placement for voltage stability analysis of power systems

The use of real-time phasor measurements for voltage stability analysis of power systems is considered. Two schemes of phasor measurement unit (PMU) placement have been investigated. In the first scheme, PMUs are used as pilot points for the secondary voltage control of a power system. Several criteria for pilot point selections are reviewed and assessed. In the second scheme, the PMUs are used for the purpose of estimating the whole state of the system. This is a prerequisite for the determination of the voltage stability margins. The goal is to find the minimal set of PMUs that makes the system both linear and observable. By making use of the simulated annealing method, an algorithm which achieves this goal has been developed and tested on several power systems of various sizes and structures