Closed-loop identification and tuning for damping of interarea modes

A Study on LQG/LTR Control for Damping Inter-Area Oscillations in Power Systems

“…1) Thus, the optimal state-feedback control law is given by (10) where and is the unique symmetric positive semidefinite solution of the algebraic Riccati equation (ARE) (11) subject to being stabilizable, , , and has no unobservable modes on the imaginary axis [19]. 2) For practical implementation measuring all the states of the plant is infeasible, thus, an estimator (Kalman filter) is employed to provide the required estimates.…”

“…methods received increased attention in power systems [6]- [10], however, issues with weighting function selection make the whole design procedure difficult. Linear quadratic Gaussian (LQG) control approaches using different FACTS devices have been presented for closed-loop identification in [11], [12], and power system stabilizer (PSS) for small systems in [13]. Recently, [14] presented work on a power system network with a TCSC device which partially relates to this brief, however, it is only applied to a rather small single-input, singleoutput (SISO) system and addresses the loop transfer recovery (LTR) problem from a simulation point of view.…”