A steady-state voltage stability analysis method based on equivalent of grid parameters

A voltage stability analysis method based on the value of grid parameters is presented in this paper. The algorithm uses local synchronized phasor measurement to identify real-time online parameters in situ. After identifying the two-node equivalent system and static load model, it can estimate voltage stability in real time according to a node voltage stability index. The method is the local two bus equivalent system n-shaped branch model identification based on reactive power characteristics and the variation of load parameters can better reflect the line. Finally, combined with the simulation results of the new England 39-bus system, we compare the different equivalent system models and load models. The results show that the proposed method can provide more accurate voltage stability estimation index, and verify the feasibility of the method.