Power Transmission Paths Based Voltage Stability Assessment

A new method for on-line voltage stability assessment based on power transmission paths is presented in the paper. A power system is decomposed into many power transmission paths. By defining the weak power draining buses incorporating the electrical distance information, the weak power transmission paths are determined. Through their two-bus equivalents, the voltage stability index of the power system is calculated. The voltage stability degree of the power system is assessed by voltage stability index incorporating reactive generation reserves. Simulation results of the New England test system demonstrate that the accuracy and speed of the proposed method satisfy the need of on-line voltage stability assessment