Further Advances on Discrete Electromechanical Oscillation Control

This paper presents further advances on a novel power system oscillation control based on step-wise changes in power output of electronically-interfaced resources (EIR). This discrete control technique is used to significantly reduce the amplitude of multiple modes in large-scale systems. The mathematical formulation of the discrete electromechanical oscillation control (DEOC) is presented, including the determination of the required discrete power injection/absorption, and optimal switching conditions. Time-domain simulations in a 9-bus and a 39-bus systems validate the effectiveness of the proposed control. Through DEOC, emerging power technologies can actively participate in the power system level control, recognizing their technical limitations. Thereby, the system dynamic response is substantially improved regarding electromechanical oscillations, and new effective controllers are incorporated into the grid.