基于越限風險值指標的電網脆弱環節識別.

In order to improve the stability of power system operation, in view of the problem that the line power and node voltage will exceed the limit due to the influence of uncertain factors during the operation of the power grid, considering the two uncertain factors of wind power and load fluctuation, a risk value index of over-limit risk is proposed to identify the vulnerability of the power grid. link. First, define the risk value index of line power over-limit and node voltage over-limit risk value respectively; then, use the n-k method to simulate the situation of line disconnection and node failure in the power grid respectively, and obtain the line over-limit risk value and node over-limit risk Lines and nodes are sorted by value; and the binary decision diagram (BDD) algorithm is used to improve the identification efficiency of the n-k method; then experiments are carried out on the IEEE 30-node system and the IEEE 118-node system to verify the out-of-limit risk value index and the n-k identification method effectiveness and universality; Finally, the line disconnection and node fault are simulated respectively, and the identification indicators and methods are evaluated based on the load shedding of the IEEE 118-node system. [ABSTRACT FROM AUTHOR]