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The application of phasor measurement unit (PMU) measurements and adaptive wide-area damping control based on federated Kalman filters are investigated. The Kalman filters used for estimating the operating conditions are federated using chi-square variables and a confidence interval. When the power system is operating precisely at a preselected operating point, only the corresponding controller is...
The application of PMU measurements and perfect regulation with robust control to damp inter-area oscillations is investigated. Combined with the robust control theory, a perfect regulation control with robust performance is obtained. The closed loop eigenvalues are gradually increasing from the under damping or negative damping to positive damping. A 4-machine 13-bus study system reinforced is considered...
This paper proposes a method to analyze the low frequency oscillation (LFO) eigenvalues of uncertain system based on second-order perturbation. Firstly, the uncertain parameters are described by the interval models. Then, with second-order perturbation and interval extension, the upper and lower bounds of eigenvalues are calculated. Finally, the influence of different parameters to eigenvalues is...
This paper deals with the robust control problem for damping power system low-frequency oscillations considering the uncertainties. In the process of designing the damp controller, uncertain parameters are introduced into perturbation matrix, meanwhile, both the H∞ disturbance depression and the optimal H2 performances of the closed-loop control system are satisfied simultaneously for all allowable...
Polytope uncertainty is suitable for time varying uncertainty analysis in power systems. The addition of uncertain factor increases the robustness of close-loop system. Firstly, wide area information measured by PMUs is used as controller input to control the power transferred by HVDC. Then, an extended LMI approach is used in the controller's design considering the uncertainty. In the paper the state...
A method to analyze the low frequency oscillation of the uncertain electric power system is proposed. When the structure of the system changes, based on the system reduced admittance matrix, the classic generator model, and the data acquired by PMU, the change of the system state matrix can be calculated by using Taylor series expansion. With the initial state matrix and its left and right eigenvectors,...
The application of PMU measurements and collocated control to damp inter-area oscillations with coordinated DC lines and static var compensators (SVCs) is investigated. The closed loop eigenvalues are excluded from a region of the complex plane guaranteeing that low frequency modes must be damped. A 16-machine, 68-bus study system reinforced with four DC lines or two DC lines and two SVCs is considered...
This paper develops a systematic procedure of designing global power system stabilizers (GPSSs) based on collocated control to enhance the damping during interarea oscillations. The availability of remote signals from phasor measurement units (PMUs) enables the wide-area control in large scale systems. The closed loop eigenvalues are excluded from a region of the complex plane by the collocated control...
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