Active Splitting of Power System With Flexible Switch Under Cloud-Station Cooperative Architecture

The complicated faults in the power grid will lead to grid splitting problems in the context of the power Internet of Things. In order to ensure the safe and reliable operation of the power grid, it is necessary to solve the problem of splitting caused by the information physical failure of power grid and information network. First, a Cloud-Station collaborative information transmission framework is proposed. The distributed information transmission mechanism under the information transmission framework is described. The advantages of the above framework in dealing with power grid information failures are analyzed. Then, an active splitting strategy is proposed for power system with flexible switches under severe faults (including optical fiber communication interruption) of power grid by the improved spectral-clustering algorithm. When the power grid is splitting, the flexible switch is put into operation and controls the power flow to balance between the disconnected subsystems. The improved strategy considers the basic constraint, while adds the connection constraint of flexible switch and the modification of generator homology constraint to the operator. It can realize stability of the system after splitting in frequence and voltage, to ensure the transient stability of the power grid which facilitating the restoration of the power grid after faults. The above models are constructed in PSCAD for simulation, and the simulation results shows that the algorithm proposed in this paper is efficient.