Modeling and Coordinated Control of IPFC and SVC to Improve the Low Frequency Oscillation Damping

As flexible AC transmission systems (FACTS) have come to maturity, major advances have been made in the field of power system dynamic stability and low frequency oscillation damping. Interline power flow controllers (IPFC) and static var compensators (SVC) members of FACT devices family which are used to, respectively, realize optimal power flow over transmission lines and inject reactive power to transmission lines for maintaining voltage magnitude. In this paper, following to the modeling of a single-machine infinite bus system equipped with IPFC and SVC, a power system stabilizer (PSS), without FACT devices controller, is designed. After selecting the most effectual IPFC control signal, with the use of residue theory, a coordinated control design of IPFC and SVC in absence of PSS is carried out. Moreover, the parameters of proposed controllers are optimized using imperialist competitive algorithm.