Vulnerable Branch Assessment Based on Branch Energy Function

Power grid vulnerability, as the deepening and developing of network security issues, shows its great research significance. Based on the energy function theory, branch static energy function model was constructed comprehensively. Multi physical quantity was mapped to the amount of branch energy; The branch vulnerability can be reflected more accurately under different operation states; And then, the Vulnerable Sensitivity index established in the form of energy was founded to assess vulnerability and the Branch Vulnerability index was proposed to evaluate branch vulnerability degree; The Vulnerable Sensitivity with the system load and structure changing was analysed to confirm the key vulnerable branch . At last, the simulations of this method in IEEE-30 bus system demonstrate its validity and feasibility. The proposed approach is promising to be applied in on line vulnerability assessment.