Vulnerable branch assessment of power grid contains double-fed wind farms

Wind power has the characteristics of stochastic volatility and absorbing reactive power on grid, so it becomes a disturbances source of power grid, and further impact on the vulnerability of the system. This paper took double-fed wind farms as the object, establish the doubly-fed wind turbine wind power system dynamic mathematical model, including wind speed, and model of doubly-fed induction generator. Then, this paper combined static energy function model with electrical betweenness and proposed a new comprehensive assessment indicator which reflect both the state of a branch of vulnerability and fragility of the structure. At the same time, made discrete indicator serialization; got a continuous comprehensive assessment indicator. After this, this paper sot up a simulation of grid model with double-fed wind farms. Finally, by simulating, this paper got a continuous curve that comprehensive assessment indicator changes with integrated wind, and compared different access points the changes in the vulnerability of the branches in the grid, and the results was analyzed.