Robust ESS-Based Stabilizer Design for Damping Inter-Area Oscillations in Multimachine Power Systems

In this paper, a robust approach to the energy storage system (ESS)-based stabilizer is proposed to select its installation location, feedback signals, and damping control loop, and to tune the stabilizer parameters. Based on the linearized model of the power system with ESS and application of damping torque analysis (DTA), the maximum of all minimum damping torque indices (DTIs) under multi-operational conditions is used as the index for selecting ESS installation locations, feedback signals and damping control loops. The operational condition for the minimum DTI provides the condition for tuning the ESS-based stabilizer parameters for robust operation. And a proper compensation angle is selected by a robust method to design the ESS-based stabilizer parameters. The eigenvalue analysis and non-linear simulation results of a four-machine power system and New England ten-machine power system with ESS show that power system oscillations are suppressed effectively and robustly by the ESS-based stabilizer.