This paper addresses the problem of damping interarea oscillations via power modulation of a VSC-HVDC link integrated in a power AC grid. Motivated by the fact that interarea modes may be at higher frequencies, close to other modes of the system, and classic tuning methods of standard (IEEE) power oscillations damping controller structures may not give satisfactory results. A reduced order model of a meshed AC grid with a HVDC link is proposed for control design. Based on this model which carefully integrates the dynamics of interest, a robust controller for the HVDC link is designed to damp interarea oscillations and enhance the damping of the other modes. Investigations with both linearized and nonlinear model of the system are carried out to settle and validate the approach. The efficiency and robustness of the proposed controller are tested and compared with standard controller structures.
In this paper, the input signals and the control model structure of the HVDC link POD control are studied. First, a benchmark is proposed to investigate the input signal selection of the POD controller. Next, by considering different situations, it is shown, based on the residues criteria, that the choice of the input signal depends on the parameters of the system. More precisely, the numerical results show that, the power level of the system and the impedances of its transmission lines play an important role. The proposed benchmark is also used to analyse and to control an inter-area mode. Its validation is done based on a realistic power system of 23 generators. In practice, all these results can be exploited to improve the performances analysis and the control design of modern power systems.
Labmatoire de Rsbotzque et d 7nleJligmce hti$cieEle, CDTA. 128, Chemin Moplamed Gacepn, El-lbfadaaniirr, BP. N o 245.16075 ALGER., ALGEHE.Abdract : The dynamical model of m-datur rob& is r q " k d by equalions system which are nonlinear and strongly coupJed. F-me, the inertial p a r i " s of the "ipdator depend on the p a y l~d Iwfi.i& is o b unknown and variable. So, to avoid ltbese probkms we studied variable stnvztmse system To rthis end, an a p p l i d o n of &e sliding mode control based m vxiabk s t " e system fos a four degrees of fidm T o h t is described in this paper-This technique suppresses the uncertainties dne io parametric variaons, eternal disturbances d variable payloads. To prove these advantages, this t e c h q u e is applied to the regulation (point to pokt) cuntrol of the SCARA robot. so the aim of this work to &ow the p d c a l realization and to demonstrate the robustness and the validity of this control law on the robot manipulator via experimental results obtained and discussed in the d is well suited for robcdies "S.
The dynamic structures of three usual models for power transmission lines are compared. It is shown that, from a systemic point of view, the so-called π-model is the reduction of the distributed parameters one. This complements the well known comparison of the trajectories provided by these models. This new view is useful for the analysis and simulation of power systems dynamic behavior. Indeed, this structural analysis allows one to better link the models used in simulation to the specific phenomena which have to be reproduced like, e.g., interarea oscillations, hyposynchronous oscillations. This leads to the unification and classification of some models actually used in different simulators which can thus be simplified and improved. The results have been obtained in a theoretical framework and, afterwards, checked by numeric simulations.Index Terms--Power transmission lines, infinite dimensional systems, model reduction.
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