Power flow computations of convertible static compensators for large-scale power systems

Power flow models of Convertible Static Compensators for large-scale power systems are investigated. Two families of multi-configuration and multi-functional FACTS controllers, including Interline Power Flow Controllers (IPFC) and Generalized Unified Power Flow Controllers (GUPFC), are considered in details. Mathematical models of the IPFC and GUPFC based on d-q axis reference frame decomposition have been derived. A unified procedure to incorporate IPFC and GUPFC models into the conventional Newton-Raphson power flow solver is developed. Under this framework, for each IPFC or GUPFC, only two control parameters are appended in the unknown vector of iteration formula. Simulation results on a practical large-scale power system demonstrate the effectiveness and robustness of our models. Comparison studies for convergence performance with existing model are performed.