Out-of-step protection using the analysis of electrical power Vs speed deviation in state plane

This paper proposes a real-time out-of-step protection method using state plane analysis of generator electrical power and speed deviation. Electrical power and speed are used as input variables to the proposed scheme for transient stability assessment. The proposed technique is tested in the IEEE 12-bus test system for first swing stable, unstable, and multi-swing instability conditions to verify its performance. Electromagnetic transient modeling of the test system is done and simulations are performed using PSCAD/EMTDC™ in order to test the proposed algorithm. The simulation results indicate that the proposed method is computationally simple and accurate in predicting the transient stability of the power system.