Coordinated control of multi-FACTS to enhance the small disturbance stability of the power system

The widespread application of FACTS will be an obvious tendency with the development of power system, as FACTS have the ability to optimize power flow, reduce the network loss, increase power system damping, improve voltage stability and so on. Therefore , there is particular urgent needs to study the coordinated control of the multiple FACTS in the system. This article uses the robust control method to control the TCSC and SVC in a system, the power system is equivalent to a two-machine system, all-state equations of the system can be written according to the generator equations and flow equations, from which we can solve the robust problem and get the control law of FACTS. The robust control strategy of FACTS is simulated by the software of PSASP on a power system of 4 generators, and the results show that the Robust control strategy can improve the small signal stability of the system.