Research on power system self-adaptive islanding based on real-time measured data

It is possible to prevent collapse of the whole post-fault power system, which is in unstable condition, by islanding control method to calm down system oscillation. Finding out the out-of-step modes is the key step of islanding control. A fast out-of-step detection method based on real-time measured data is presented in this paper. In this paper, the voltage phase angle of each branch and the active power through each branch is measured. Then, the out-of-step mode is determined when the out-of-step branch forms a cut-set. Finally, the islanding boundary is found based on the out-of-step mode and proper islanding boundary searching method. The method presented can be easily carried out and the result is found real-time. Simulation on IEEE 118-bus power system shows that the proposed method is effective.