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Acorrding to the poor effect of traditional voltage stability method in the actual power network, a new method, combination of the P-V curve and modal analysis, was put forward. First, Kp(power reserve coefficient) was calculated to measure the power system static voltage stability margin through P-V curve. Then, on the basis of that, the modal method was used to get a detailed analysis. The participation factors under the minimum singular value of each node were calculated to find out the weak area, the key branch and key generators of the power system. These results may guide operators to note the weak areas, timely adjust the power flow, and arrange reactive power compensation and so on after a major disturbance. The study of a large power grid, with the help of the PSD-Vsap, a static voltage stability program, verifies the validity and practicability of the method.

Static Voltage Stability Analysis of Power System Using the Combination of P-V Curve and the Modal Analysis