Generator Tripping Strategy Based on Complex Network Theory

Based on researches on dynamic network synchronization in complex network theory,a new algorithm for generator tripping strategy is proposed for transient angle stability of power system.Firstly,the diagonal elements of power system state matrix are defined as synchronizing ability indices of corresponding generators to reflect the coupling strength among generators and power network;secondly,the impacts of generator tripping strategy and short-circuit faults on generators’ synchronizing ability indices are analyzed and the validity index of the position where the generator is tripped is put forward.Based on this index,a method to calculate generator tripping strategy is given,i.e.,using linearization model of power system the optimal position where the generators will be tripped and the amount of generators are to be tripped are determined,and then nonlinear model of power system is utilized to check the feasibility of generator tripping strategy,thus the transient angle stability control can be implemented.The effectiveness of the proposed algorithm is verified by simulation results of IEEE 9-bus system and IEEE 39-bus system.