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Concerning the stochastic excitation caused by wind power fluctuation and the stochastic parameter of virtual inertia caused by wind speed uncertainty, a power system stability analysis method considering the Wiener noise is proposed in this paper. First, based on the reduced-order model of DFIG retaining virtual inertia control and phase-locked loop (phase-locked loop) dynamics, the analytic function...
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...
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