FACTS control design based on power system nonparametric models

The paper presents two applications of the sampled regulator design method (SRDM) to flexible AC transmission systems (FACTS) control, using unified power flow controller (UPFC) DC capacitor voltage control and static VAr compensator (SVC) AC voltage control, based on nonparametric models of the power system. The SRDM was developed in the 1980s for the design of a class of sampled regulators for uncertain, nonlinear systems and can guarantee control system stability, optimality and robustness. The design only requires knowledge of the open-loop system step response-a nonparametric model-which is particularly attractive for applications in power systems, where field tests to obtain nonparametric models are usually much easier to apply than the development of parametric models. A comprehensive demonstration of the SRDM for UPFC DC capacitor voltage control and SVC AC voltage control in example power systems is given