A Control Strategy for Damping Subsynchronous Oscillation Based on Voltage Source Converter Excitation System

As the traditional thyristor static excitation system is widely applied in the power system, the electrical damping of the system is weakening, and that makes the system facing the risk of subsynchronous oscillation(SSO). Although some research on Flexible AC Transmission Systems(FACTS) for damping SSO has been proposed, the applying of the FACTS is not economic enough. The Voltage Source Converter(VSC) Excitation system is a kind of excitation system using full-controlled power switches. There is no research on damping SSO based on the VSC excitation system. By analyzing the characteristics of the VSC excitation systems, a control strategy for damping SSO based on phase compensation method is proposed.