A transients segmentation based control for SMES to enhance power system stability

In modern power systems, the increase of renewable energy generation is a big challenge to the power system stability. The novel stabilizer based on the superconducting magnetic energy storage (SMES) is a promising method for stability enhancement of power system. In the application of SMES, the controller is a key component which determines the capability of SMES. This paper proposes a new controller for SMES to enhance both the damping and the transient stability of power system. The proposed controller utilizes different laws in the different stage of power system transients after a large disturbance. The simulation results show that the system with the proposed controller has smaller states deviation than using the damping controller and less oscillation decay time than using the transient controller when a three-phase-fault happens in the transmission line. Meanwhile, the proposed controller maintains the high damping ratio of the system in steady state.