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A method is proposed in this paper to select the input signals for both single and multiple flexible ac transmission system (FACTS) devices in small and large power systems. Different input-output controllability analyses are used to assess the most appropriate input signals (stabilizing signal) for the static var compensator (SVC), the static synchronous compensator (SSSC), and the unified power-flow controller (UPFC) for achieving good damping of interarea oscillations. The study presented in this paper is carried out on one small system with one FACTS device at a time; and one large system equipped with the SVC, the SSSC, and the UPFC. Index Terms--FACTS devices, input-output controllability analysis, input signal selection, optimal location, power system oscillation, stabilizing signal.

Mixed performance control problems have been the objective of much attention lately. These problems allow for capturing different performance specifications without resorting to approximations. In this paper, a mixed H2/H∞ with regional pole placement is used to design controllers for SVC, SSSC and UPFC placed in a small power system to secure system operation against inter-area modes. This multi-objective design allows for more flexible and accurate specification of the desirable closed-loop behaviour, both in the time and frequency domains. The results of the proposed multi-objective approach are compared with pure H∞ method (mixed-sensitivity), which show the effectiveness of this approach. [Copyright &y& Elsevier]