Method and system for acquiring severest voltage stability margin based on coordinated continuation power flow

A system for acquiring the severest voltage stability margin based on coordinated continuation power flow, comprising:

• a partial derivative acquisition module, suitable for acquiring a critical node of an interconnected power system under a current load, and calculating a partial derivative of initial voltage amplitude of the critical node with respect to the load level of each partition of the interconnected power system;
• an updating module, suitable for calculating an amount of the load growth of each partition of the interconnected power system according to the partial derivative and a preset load growth step length, and updating an active power output and the current load in the interconnected power system according to the amount of the load growth based on a coordinated continuation power flow model;
• a voltage judgment module, suitable for judging whether a new voltage amplitude of the updated critical node is less than the initial voltage amplitude if the coordinated power flow of the updated interconnected power system converges;
• and
• the severest voltage stability margin acquisition module, suitable for judging whether the preset load growth step length is less than a corresponding convergence threshold if the new voltage amplitude is greater than or equal to the initial voltage amplitude, and acquiring the severest voltage stability margin based on the updated loads of the interconnected power system if the preset load growth step length is less than the corresponding convergence threshold.