Optimal robust controller designing of Back-to-Back VSC-HVDC links to damp low frequency oscillations using imperialist competitive algorithm
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2014, Vol 8, Issue 5
Abstract
In this paper, dynamic equations of back-to-back VSC-HVDC system are obtained using linearized Phillips-Heffron model. In the next step, obtaining firing angle and voltage characteristics in different operating points, a closed-loop supplementary controller is designed to damp the electromechanical oscillations, enhance the dynamic stability, and decrease the time of transient response under the event of disturbances. In order to optimally design the controller, imperialist competitive algorithm is used. Four controlling signals are considered under multiple operating points. Defining the performance index, the appropriate controlling signal is opted which leads to oscillation damping, system stability enhancement, fast transient response to faults, system flexibility and attenuation of disturbances. The test case is simulated in MALAB-SIMULINK; then the model efficiency and the proposed method performance are studied.
Authors and Affiliations
Babak Ghorbani| Department of Electrical Engineering, College of Electrical Engineering, Ardabil Science and Research Branch, Islamic Azad University, Ardabil, Iran, Seyed Jalal Seyedshenava| Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran, Adel Akbari Majd| Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
Keywords
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