|Title:||Robust SVC controller design for enhancing power system stability|
|Subject:||Electric power system stability|
Hong Kong Polytechnic University -- Dissertations
Department of Electrical Engineering
|Pages:||viii, 74 leaves : ill. ; 30 cm|
|Abstract:||Power system low-frequency oscillations due to the interconnection of power systems imposes unnecessary limitation on power system operation. Rapid advances in power electronics have made it both practicable and economic to design powerful thyristor-controlled series and shunt compensation to improve the system damping. In this dissertation, the control design of the commonest shunt compensation device, static var compensator, is investigated. The SVC location and damping signal are chosen by both modal and sensitivity analyses. As the SVC instability is detected in the design process, the design (structure and setting) is achieved through a combined sensitivity coefficient (CSC) which automatically takes into account the damping of both the interarea and SVC modes. Although the CSC design based on the sensitivity analysis can improve the interarea mode with consideration of SVC mode instability, this classical approach is based on a single operating point only and without consideration of the robustness of the system. Therefore, a robust H∞ based SVC damping controller is further designed by treating the dynamics of the SVC mode and noise of the thyristor switching as high frequency model uncertainties, and the change of system operating point as low frequency uncertainties. The numerator-denominator perturbation uncertainty modeling and partial placement techniques are employed to overcome the conventional H∞ design limitations. The proposed design is verified to have better performance than the conventional approach in terms of the robustness of the closed-loop system on the aspect of model uncertainties.|
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