Methodology for tuning stabilizers taken into account operating restrictions

The aim of this paper is to expose a method to introduce transient stability constraints into the problem of stabilizers coordination solved by an optimal criterion. The problem is posed in such a way that different operating conditions and fault locations may be taken into account, leading to robust stabilizers. The proposed procedure is based on minimizing the incremental real part of modes of concern; such increments are evaluated through second order sensitivities. Inequality constraints are embedded into the problem in order to circumscribe the excursions of some signals by the stabilizers action. Different power systems are considered as sample systems to exhibit the main results of the proposed methodology.