A method to generate dynamic accident set for power grid clustered faults caused by tropical cyclone

According to the situation that the tropical cyclone frequently causes the damage of power equipments in costal power grids in China and even leads to the power supply interruption in local regions, a method to generate dynamic accident set for power grid clustered faults caused by tropical cyclone is proposed. Through the conversion of the statistical data of historical fault rate of transmission lines, a curve of line fault rate in specific span varying with the wind pressure born by the line is established, and based on real-time wind pressure born by the line in specific span the fault rate of the line in specific span and its probability of fault occurrence within the chosen time window are calculated; regarding the whole length of the line as a reliability system composed of several spans connected in series, the probability of fault occurrence of the whole line can be calculated by the formula of the serial reliability system. Further, a probability threshold is set to judge whether the fault state could be entered into the fault set or cut-off multiplicity of the fault is stipulated to choose the combined states of faults, and then the fault states that meet the requirements are sorted to form a dynamic clustered fault set. The practicability of the proposed method is validated by a test case of power grid impacted by high intensity of tropical cyclone, and the method of setting probability threshold is adopted to choose combined states of faults, sort them and finally generate the dynamic fault set.