Damping Subsynchronous Resonance Using Emergy Storage

A method of damping torsional self excitation due to subsynchronous resonance is presented. This method utilizes a small AC-DC converter connected to the machine bus of the affected generator. The DC side of the converter connects to a large inductor which is used to store energy. Various methods of controlling this inductor converter unit are proposed and analyzed. The effectiveness of these control methods is demonstrated using a detailed computer simulation of a benchmark system known to be affected by subsynchronous resonance.