Study Of Damping Subsynchronous Oscillation Based On SVC

With the quick development of the power system in China and the deeply planning implementation of the transmission of electricity from the western to the eastern region,more and more series capacity compensations have been used in transmission system extensively and the subsynchronous oscillation problems caused by series capacity compensation also come.Therefore, the study of the oscillation mechanism and control measures of Subsynchronous Oscillation has practical meaning and the important engineering application value. The emergence of the Flexible AC Transmission Systems provides a new way or strategy for the problem to solve needly.As one of the members of the FACTS, it is possible for static var compensator (SVC) to control the electric power system time synchronization oscillations, improve system performance.In this paper, the principle damping for subsynchronous oscillation based on SVC, the control strategy and the design of control system are the main contents. It analyzes the SVC base wave power frequency modulation, time synchronization control mechanism of production and the shaft generator torsional vibration modal frequency complementary current component in generating set and the produce corresponding modal damping mechanism of torque. The appropriate SVC controller is designed based on the subsynchronous oscillation problems of the first IEEE standard mod el.In this part, the system of electromagnetic transient simulation platform is established based on PSCAD/EMTDC time-domain simulation method. Through the time-domain simulation,it proves that the mechanism damping for subsynchronous oscillation based on SVC is right.The effects damping for subsynchronous oscillation are compared and analyzed. In addition, the effects of subsynchronous oscillation by SVC capacity are analyzed and the capacity configuration options are given.