A PMU-based three-step controlled separation with transient stability considerations

Controlled separation has been identified as one of the critical strategies to prevent a blackout of a bulk power system following a severe disturbance. To implement this critical strategy, optimal splitting points have to be identified subject to a series of steady-state and dynamic constraints. In this paper, a systematic controlled separation with three steps is proposed to cover steady-state and dynamic constraints with PMU measurements. At the first step, the power flow tracing method is employed to pre-determine the splitting points and establish rough islands. The buses cannot be covered at the first step will be analyzed with steady-state constraints at the second step. The last step will check the transient stability during the system separation with PMU measurements. The strategies with good steady-state and dynamic performance will be identified. A test system is shown to validate the proposed method.